Engine Misfire Diagnosis & Fuel Injector Replacement

Did our video help you? If so, consider buying us a beer: bit.ly/3feE6tJ
*PLEASE READ THIS AND THE COMMENT WE PINNED FOR HELPFUL INFORMATION*
In this video, we discuss some logical steps you would go through diagnosing a misfire on your engine and then we show you how to replace all 6 fuel injectors on your Toyota 3.4 L V6 5VZ-FE engine.
On the positive side, Greg reported that he had better throttle response and his engine had more power after the fuel injector replacement. On the negative side, Greg's P0301 misfire code popped up again after 20 miles of driving. So, we're going to try to get Greg back over to do some more diagnosing to try to figure out why he's getting the misfire code. What we do know is his engine runs fine. It idles smooth and he has good power so there's no way he's running on only 5 cylinders.
MotorWest Performance
9741 Lurline Ave
Chatsworth, CA 91311
Owner: Martin Diaz
[phone]
motorwestperfo...
*PARTS*
*Set of 6 Fuel Injectors from MotorWest Performance - #23250-62040
motorwestperfo...
*Single Fuel Injector from Toyota - #23209-62040
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*Injector O-Rings - #90301-07001
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*Fuel Pressure Regulator O-Ring - #90301-07024
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*Fuel Pipe Gaskets (Aluminum Washers) - #90430-12026 (Need 6)
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*Upper and Lower Plenum Gaskets - #17176-62040 (Need 2)
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*Throttle Body Gasket - #22271-62040
amzn.to/2PLsMo1
*HELPFUL TOOLS*
If you're looking for other tools not used in this video, check out Timmy's Master Tool List.
www.amazon.com...
*1/4" and 3/8" Flex Head Ratchet Set - (used both these ratchets in this video. They are super functional and will make your wrenching life easier) amzn.to/2ql8nNA
*1/4” Drive Regular Extension Set
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*3/8” Drive Regular Extension Set
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*1/4” Drive 6 Point Standard Metric Socket Set
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*3/8" Drive 6 Point Metric Standard Socket Set
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*3/8" Drive 6 Point Metric Deep Socket Set
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*Flex Head Box End Wrench Set - (used a couple different wrenches in the video. These ratchets are super functional that will make your wrenching life easier) amzn.to/31x8BOo
*Milwaukee Mi12 Cordless Ratchet - (this is great for speeding up the removal and reinstallation of fasteners. I use it for most of my jobs to save time.) amzn.to/2utRZsE
*Milwaukee M12 Battery
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*Milwaukee M12 High Capacity Battery
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*Milwaukee M12 Battery Charger
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*Right Angle Needle Nose Pliers - (used to remove hose clamps)
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*Small Pick Tool Set - (used to break free hose connections off fittings)
amzn.to/2MyN4AH
*Painter’s Tape - (used to cover intake manifold ports)
amzn.to/2PnQojx
*20 Piece Screwdriver Set - (nice complete set if you're in the market for a screwdriver set)
amzn.to/34aLrQ1
*Long Set of Ratcheting Box End Wrenches - (used to break free fuel rail banjo bolts. The extra length affords you more leverage to break free tight fasteners) amzn.to/2oOhndL
*Multimeter - (The one I bought via Amazon isn't available anymore but this one looks pretty good) amzn.to/2NcuGwr
*CDI 3/8" Drive 30-250 Inch Pound Torque Wrench - (used to torque all the fasteners for this job)
amzn.to/2J8W8Kz
*CDI 3/8" Drive 10-100 Foot Pound Torque Wrench - (used in conjunction with the crows foot wrench to torque fuel rail banjo bolts) amzn.to/2U2vUA4
*Brake Cleaner (More affordable option to Clean Streak)
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*Crowfoot Wrench Set - (used in combination with the torque wrench to torque fuel rail banjo bolts)
amzn.to/362U9Bo
*Battery Terminal Cleaner - (nice tool to clean the battery posts and the inside of the battery clamps)
amzn.to/36HovJb
**As Ebay Partner Network members, we earn commissions from qualifying purchases.
**As Amazon Associates we earn from qualifying purchases.
*Torque Values*
Fuel Pressure Regulator Bolts - 71 in-lbf
12mm Fuel Rail Bolts - 10 ft-lbf or 120 in-lbf
17mm Fuel Rail Bolts - 25 ft-lbf
Timing Cover Bolts - 80 in-lbf
Upper and Lower Plenum Bolts & Nuts - 13 ft-lbf or 156 in-lbf
Throttle Body Bolts and Nuts - 13 ft-lbf or 156 in-lbf

[@TimmyTheToolman]

*PLEASE READ THIS COMMENT AND THE VIDEO DESCRIPTION FOR HELPFUL INFORMATION* When using the crows foot wrench to tighten the banjo bolts on the fuel rails, to get an accurate torque value, I should have had the crows foot at a 90 degree angle with the torque wrench instead of how I had it inline with the torque wrench. By doing it the way I did, I increased the leverage of the torque wrench and thus tightened the bolt more than the torque value set on the wrench. So, if you want an accurate torque value when using a crows foot wrench attached to your torque wrench, have the crows foot at a 90 degree angle and you'll be good to go.

[@Cornfed_Off-road]

Where's the pinned comment about why Greg's engine light kept coming on after 30 miles? Mine is doing similar

[@ernestopop3284]

How to replace o2 sensor on a hunday genesis 2016

[@TimmyTheToolman]

@@ernestopop3284 I don't understand your comment. Are you asking us to make a video for that?

[@pitchforkpeasant6219]

Love your baggie labeling system. Works awesome 👍👍

[@alexsp007]

Did the misfire comeback? My toyota tacoma is having a cylinder 1 misfire, I have replaced spark plugs, coils, tomorrow I'm going to check if there's current flow is going through the coil and connector. Where did you get your service manual by the way?

[@thouartit]

I wrote you a while back, yammering about to much talking. I now want to say - well shut my mouth. I have since reviewed more of you videos, and now think your channel is the only "comprehensive", complete auto repair channel on the web. I wish the repair was on a 2.4, but what the hell. Now I see you as a true gentleman, articulate, knowledgeable and a total pro at filming and editing. Quite an accomplishment, beyond being the first one to receive an apology from me, since the nixon administraton.

[@TimmyTheToolman]

Thanks Bro! I appreciate you returning and sharing this with us. A true sign of character is being able to admit when you're wrong. I'm wrong all the time, but I admit my mistakes and try to learn from them. Being too verbose is one of the things I'm most commonly criticized for. I know I talk a lot and sometimes repeat myself, but it's only because I want to make sure my message is conveyed clearly and accurately. Sean and I decided when we started making videos together that we didn't want to confuse people. We wanted people to understand exactly what to do and how to do it. This meant we had to create videos that were very detailed and comprehensive that a total beginner could understand and follow along. As soon as we start assuming people know a certain amount, that's when we'll start losing people and confuse them. We decided to go against the standard suggestion of making short videos, no longer than around 20 minutes. We sometimes break long jobs into parts because it makes sense to do so, like when we've done transmission and engine swaps. But, we quite often put out hour long videos instead of braking them up into 3 shorter 20 minute videos because what's the difference? We would only be inundating the audience with even more advertisements and maybe that's why some creators do that. If people want to learn how to do a job, they'll sit through the hour long video and be stoked we provided them with the information. Thanks again for your nice compliment of our channel. Happy Wrenching!

[@juliusgallares8764]

#3 Misfire when Warm finally fixed! After changing plugs, wires, coil pack I decided to replace fuel injectors with reconditioned ones from Motorwest. I was reluctant to do a compression and leak down test because this was an intermittent issue. This video was awesome and was vital to my confidence and success. I would also highly recommend Motorwest for OEM Fuel injectors. I’m glad I had new plenum a and TB gaskets. I no longer have the #3 misfire and CEL. My 4Runner that has 251k, starts way better, the throttle response has increased and the engine seems to run quieter for some reason. Notes/Tips - be careful to not over-tighten the intake plenum because the aluminum can strip out. Use a torque wrench and the fuel rails and intake, especially if you are not confident with your tightening abilities. Replace your gaskets, it’s a better feeling having them when removing parts. OEM Fuel injectors only, Motorwest is the way to go and a pleasure to work with. I cleaned my intake plenum with degreaser. It looks way nicer. Vacuum out dirt/debris/broken plastic inside side of valve covers and fuel injector ports. Replace your fuel rail gasket/washers. 6 are needed. The job took about 3 hours and I took my time. Thanks Timmy for your fast response and Motorwest for the fuel injectors.

[@TimmyTheToolman]

Hey Julius, great to hear you found our video helpful and swapping out the injectors fixed your misfire problem and you're engine is running overall better. Thanks for taking the time to comment and share your success with us. We appreciate it. Happy Wrenching!

[@CharlieCiampa]

Thanks for sharing, I will try this!

[@crystalthurmond7254]

Love your videos Timmy! I have a 2003 Tundra with this same engine at 230k miles. I get stoked watching you do all these repairs and I want to go fix mine every time I watch one. There’s just one problem. The darn thing won’t break!

[@TimmyTheToolman]

Great to hear you like what Sean and I are doing. Well, if you ever have problems with your rig, you'll hopefully find a video on our channel that will help you out. Thanks for taking the time to comment. We appreciate it!

[@nurmworks-4284]

This is a fantastic resource for this type of job. I have a 99 4Runner and I recently had a #4 misfire (flashing CEL) and at the time, did not know (or have the ability) to diagnose it, so I had it towed to my local dealer. Ugg... we all know what happens next... They "diagnosed" it as a bad injector, and replaced it (says NAPA on the invoice) for somewhere north of $600 all in. After watching this video probably 10 times, I felt like I could do this myself, and ordered a set of reman injectors from Motorwest as well. Talk about a great company. Fast and extra o-rings just in case! Anyway, I ended up digging in there yesterday and got them all swapped. No issues. Thanks for all the detail you guys put into this video. It gave me the confidence to tackle this job myself, not to mention the excuse to buy more tools! (the 17mm crows foot especially), so it was win-win for me as well. I also decided to get all the gaskets for the valve cover job and do that at the same time, since upon further inspection (and a little sniff test), I got some oil leaks that burn on the exhaust. Also using your video for that. And if it couldn't get any better, I used your other video on valve lash to check the clearances, since I was going that far into it already... Once again, fantastic job guys. I can't even think of how much I saved.. and knowing it was done correctly. On a side note, I could tell where the dealer guy had been, since I found 2 bolts lodged behind some fuel lines, and that plastic cover over the harness (the ones that are really brittle) was completely non-existent on the drivers side and pretty much destroyed on the passengers side...

[@TimmyTheToolman]

Good job getting all that work done. Great to hear our videos helped you out. Can't believe your dealer used a Napa injector. That's pretty bad. Thanks for sharing your story with us. Happy Wrenching!

[@dsa420meh7]

how much did it cost you for all the parts approximately?

[@kellyanderson7115]

I love seeing a mechanic follow the service manual. Your double click on the torque wrench is a sign that you really care about doing things to the best of your ability. Good work! I've got a Launch CNC605A on order (it's hard to justify the cost...but it sure will be nice). Considering how much work is involved in fuel injector changes it's going to be nice to be able to clean and verify proper operation before buttoning everything back up.

[@TimmyTheToolman]

Thanks for the compliment. I appreciate it! Wow! You're going to have your own fuel injector cleaning machine. Let me know how well it works for you. Happy Wrenching!

[@tcwaterdrill]

I just bought a 2000 4runner about 8 weeks ago with a bad engine. Watched a lots of your videos on the 4runner. They are all really good. I just replaced the bad engine with a used one took me 7 weeks to do the job. I am getting old and my memory is not as good as it use to be so I have mark and film everything and rewatch it to see how to put it back together. When I started it up and ran it for about 5 minutes I got code p304 and p306 misfire. I have ordered 6 rebuilt injectors for it. Toyota uses 3 coils to fire the 6 cylinders, each coil fires 2 cylinders, one on bank 1 and one on bank 2 at the same time. On 2 cylinder lawn mowers its called wast fire spark. A good way to tell if it is the coil pack you will get a misfire on bank 1 cylinder and bank 2 cylinder that is fired by the same coil. Swapping the coils around will also do the same job. Sure you could be unlucky enought to have 2 bad injectors on the 2 cylinders that the one coil fires.

[@TimmyTheToolman]

Great to hear you like the videos Sean and I are making. I think working on your 4runner will help keep your mind sharper. I know for myself doing all these jobs keeps the gears turning in my head. I'm learning all the time. Swapping coil packs was one of the first things Greg tried to figure out his problem. At one point, we swapped out all 3 coil packs with ones from an engine with known good coil packs and it made no difference. If you check out the most recent videos we uploaded, we finally figured out Greg's misfire issue. His crankshaft has gross play, like around 1/4", maybe more. We suspect the thrust washers gave way causing all that play. I thought the misfire would most likely be signaled by the crank position sensor but somebody told me if the crank position sensor wasn't getting a good reading due to the crankshaft movement, the engine would run poorly or not at all. He suspected the misfire was generated by the knock sensors because the type of knock sensors on these generation Toyota engines are very sensitive.

[@jaetheo]

Great video! I just had this happen to me earlier this year. P0303 and P0306. I also replaced all of the spark plugs, new wires, replaced air filter, cleaned all of the injectors, pressure tested the fuel system and compression tested the cylinders. Everything came out great but the engine would stutter slightly at idle and would lose power at highway speeds. I finally replaced the fuel filter under the truck and that fixed everything! Might want to give that a shot.

[@TimmyTheToolman]

Thanks for sharing this possibility.

[@djm228]

Thank you so much for being in depth with your videos. The most I've ever done is changing my spark plugs, but your video gave me the confidence to tackle this. I like how you warn us to be careful in certain parts of the video. These are definitely helpful to relatively inexperienced people. Once again, thank you for making such great videos.

[@TimmyTheToolman]

Hey Daniel, great to hear our video gave you the confidence to tackle this job. Your success story is the exact reason why we provide lots of detail in our videos becuae we want everyone to be successful following our videos, not just experienced mechanics. Thanks for taking the time to comment. We appreciate it. You're very welcome and Happy Wrenching!

[@GXKid06]

When my dad and I did this to his 98, we pulled the EFI fuse and then ran the engine until it lost fuel pressure. That let the fuel pressure be gone and not let out as much fuel.

[@TimmyTheToolman]

That's a good idea.

[@sasanhassani2322]

Timmy: Your video is the best that I have ever seen. Thank you so much. I replace 3 fuel injectors just by followed your steps and cost me only 3 X $45 = $135.

[@TimmyTheToolman]

Thanks Sasan and you're very welcome. Great to hear our video helped you out. We appreciate you taking the time to comment. Happy Wrenching!

[@ChuckCargile]

Thanks for all your hard work that goes into making the videos and showing everyone how to do the job.

[@TimmyTheToolman]

You're very welcome Chuck. We appreciate your comment. Happy Wrenching!

[@hv4285]

Timmy, thank you for making another thorough instructional video. My fuel injectors from MotorWest is arriving this Thursday so I'll be replacing all 6 injectors along with the gaskets on Christmas weekend. Sounded intimidating at first since this is my first time opening up the plenum but this video provides me the confidence to do so, fingers cross my CEL P0303 goes away after this replacement! Merry Christmas to you man!

[@TimmyTheToolman]

You're very welcome. It's great to know our video gave you the confidence to go for it and do the job yourself. Good luck and Merry Christmas!

[@johntyburski531]

This is a HIGH VALUE video resource right here. Thank you! I ordered refurbished injectors from Motorwest Performance and told them you recommended their products. What a world we live in today when we shade tree guys can get instruction like this out here for free AND get connected to the best suppliers too.

[@TimmyTheToolman]

Thanks John and you're very welcome. Motorwest Performance does great work and I've heard nothing but positive reviews of their business so I'm happy to promote them. Thanks for taking the time to comment. We appreciate it. I hope the job goes smooth for you. Happy Wrenching!

[@mosthated8190]

How are those injectors holding up !?

[@waverider5751]

I found their website, thanks to you, the cleaning service is only $25/per, that’s awesome, especially for a shop in California.

[@billcoley8520]

I put new plugs. Wires, all 8 coil packs . My truck has 132,000 miles,. I took all 8 injectors off and cleaned the crap out of mine and runs nice now

[@TimmyTheToolman]

Good job getting it done.

[@billcoley8520]

Timmy The Toolman I give all the credit to KZbin, I watched video after video.

[@TimmyTheToolman]

@@billcoley8520 Yeah, but somebody had to turn the wrenches. Even with the information readily available, a lot of people aren't interested in auto mechanics. They'd rather pay somebody to do it for them. So, again I say Good Job for doing your own work.

[@tonyrowe1455]

Another successful job! Thanks for your thoroughness in making your videos!

[@TimmyTheToolman]

That's great to hear Tony. Thanks for sharing your success with us. Happy Wrenching!

[@JavierPerez-pq9fg]

@@TimmyTheToolman I.took my 2001 tundra 3.4l v6 m/t for valve cover replace but i just notice that the diagnostic black piece by the valve cover left side of engine /upper planum is missing, how i can get a new one, what is the part number or how affect my tundra driving it without it I woild appreciate your help

[@H8er-Maker]

I realize this is an old video(great job by the way) so its a long shot you're still replying to comments but i gotta shoot my shot cuz I'm running out of options. I have been chasing P0171 code. Fuel pump, fuel filter, both O2 sensors, coils, wires, plugs, air intake boot, pcv, grommet, MAF have been changed within last 2 weeks. Truck runs considerably better but code will come back within 1hr of driving afrer leaving batt disconnected overnight. While idling rpms change (drop) while spraying throttle body cleaner over fuel rail. I have gasket kit valve cover, upper, lower plenums, throttle body, valve caps, all crush washers, seals that you changed & of course while im in there i bought all injectors denso upgraded 4 hole. Is there anything internal that would cause it to run lean? That i should look at while valve cover is off. 2003 Taco with 395k miles on it. Im at a loss if this doesn't fix it. Unfortunately any CEL code prevents it from passing emissions. TIA if this comment finds you sir.

[@TimmyTheToolman]

Was the MAF you installed OEM?

[@dand4564]

Another excellent video! My go-to channel for my 4runners!

[@TimmyTheToolman]

Thanks Dan. Good to hear our videos are helping you out. This wouldn't happen to be "Fear the Beard Dan Deemer", would it?

[@dand4564]

@@TimmyTheToolman nope! I have a scary beard but that's not me ;)

[@TimmyTheToolman]

@@dand4564 Gotcha Dan. Thanks for being a fan of our channel.

[@seandalejackson2525]

Hey Tim!! My 97 4runner sr5 shutters from a stop when I push the gas. Idle fine and runs fine once moving. It's running a rich bank one code. Replaced injectors, pump, wires, coils, mass air, filter. Still shutters from a stop, can you point me in the right direction please?! Love what you do Bro.

[@TimmyTheToolman]

@@seandalejackson2525 Have you tested the throttle position sensor on the throttle body? Have you cleaned the IAC valve?

[@thedavidwalker]

Were you guys able to diagnose the misfire code after it came back on? Thanks again for all your great videos!

[@TimmyTheToolman]

Hey David, yes, we finally figured it out. It was a problem with his crankshaft. We think the thrust washers gave up the ghost and caused excessive play in the shaft. His engine has an audible knock and now we now why. So, it wasn't actually a misfire but we suspect the knock sensors triggered the misfire to the ECU. Check out the video: kzbin.info/www/bejne/b3jTlaRjqbFqb7c

[@jmt645411]

i feel afterwatching the video i could do it. thank you very much. excellent video

[@TimmyTheToolman]

Hey Justin, you can do it no problem. There's nothing special about the mechanical aptitude of Sean, myself or anyone else who's been a guest wrencher on our channel. Are some people more mechanically inclined than others? Yes, no doubt. But, auto mechanics is something people can learn and get better with over time. We always say if people are armed with the Right Information, have the Right Tools, and possess the Right Level or Patience, they can handle a high percentage of their automotive mechanic needs. We gear our videos towards the absolute beginner because we want to empower people take up the challenge of turning wrenches. Thanks for taking the time to comment and good luck with the job. Let us know how it went for you.

[@chrisp7165]

Hey Timmy, great video as always and your entire library has been incredibly helpful when wrenching on my own 98 SR5. One question I had though. Did you guys ever figure out what was actually causing the misfire? I saw that you updated the post a while back that Gregs misfire code came back. Just wondering what the final solution ended up being. Thanks again for everything you do!

[@TimmyTheToolman]

Hey Chris, Greg's problem ended up being gross play in the crankshaft. The thrust washers must have gave way causing the play. He had an audible engine knock and I finally noticed the cause when reviewing some video footage and saw the harmonic balancer move a crazy amount. Check out the video to see for yourself. kzbin.info/www/bejne/b3jTlaRjqbFqb7c

[@chrisp7165]

@@TimmyTheToolman Will do! Thanks Timmy!

[@jlpbcphd]

Impressive, clear, sequenced video!

[@TimmyTheToolman]

Thanks for the nice compliment Len. We appreciate it!

[@sirsweetness8332]

Had this issue on a 2002 Sienna. Did the coil swap but the misfire stayed at the affected cylinder. The problem was the coil would act up hot and I ended up swapping a really bad with and going bad coil. Ended up buying all 6 new Denso coils. Problem fixed.

[@TimmyTheToolman]

Thanks for sharing this. We do have some spare coils from an engine we tore apart so I'm going to hook up Greg with one of those coils and see if it fixes his issue.

[@jishnuts]

@@TimmyTheToolman Hi Tim, What is the final result. I am going to do the same stuff on my 99 T4R soon and curious to know if this really fixed the misfire. I have a misfire on cyl6 and I just ordered 6 injectors from Motorwest.

[@TimmyTheToolman]

@@jishnuts It didn't fix Greg's misfire but that doesn't mean it won't work for you. Greg did say his truck had better throttle response and more power after the refurbished injectors were installed. Greg isn't experiencing any noticeable motor issues so something is causing the ECU to record a misfire. The only problem is, we haven't yet figured it out. But, we're not giving up.

[@jishnuts]

@@TimmyTheToolman Thanks. please keep us posted. keep the great videos coming.

[@TimmyTheToolman]

We will for sure keep them coming. Thanks for taking the time to comment.

[@44doink]

Timmy I love you and thank you for all your help.

[@TimmyTheToolman]

Thanks for the love. You're very welcome.

[@richardramos1821]

Thanks Again , for this video. Need to replace my knock sensors, going to replace fuel injectors as well. Are there any of your videos showing steps to replace knock sensors? Thanks

[@TimmyTheToolman]

Look at our 3.4 Liter 5VZ-FE Swap Series. In Part 2, we strip down the old engine completely showing you how to access the knock sensors which are in the valley between the heads under the intake manifold. Part 3 will give you the steps put it back together.

[@richardramos1821]

@@TimmyTheToolman thanks Tim , do you have a link for those knock sensors in that video?

[@TimmyTheToolman]

@@richardramos1821 #89615- 12040 - Knock Sensors - Need 2 (If you’re planning on buying an engine from Yota 1 Performance, this is an add-on you can buy through them.) amzn.to/3kSjxke #82219-34010 - Knock Sensor Wiring Harness (If you’re planning on buying an engine from Yota 1 Performance, this is an add-on you can buy through them.) amzn.to/35T5eFM

[@drewwiley7083]

I know this is an older video, but I read your description and you say the problem came back up after changing them. Did you ever figure out what it exactly was?

[@TimmyTheToolman]

It ended being gross play in the crankshaft. Check out the video: kzbin.info/www/bejne/b3jTlaRjqbFqb7c

[@surfergerm]

Hi Timmy, I cant seem to find the washers or gaskets for the Banjo bolts any where. Even the dealerships don't have them. Where did you get your??? Awesome video!!! Thanks for your help.

[@TimmyTheToolman]

The dealerships do have those washers. I bought them at my local dealership.

[@peternguyen6368]

At 21:40, should i be concerned about the fuel leaking once we break free that bolt? Thanks Timmy!

[@TimmyTheToolman]

It's not a big concern. Not much fuel comes out. Just don't smoke a cigarette while you're doing it.

[@nightdipper5178]

I had a misfire on cyl three, the plug had a carbon streak on the porcelain. Changed plug ran good for a week then the carbon streak and misfire returned on the cly 3. Long story short it was the "TPS" (Throttle position sensor). I Don't understand how the bad sensor resulted in those symptoms, but it did. Although rare I have heard of other 3 gen 4r owners having this symptoms/issue, quick and inexpensive to fix but difficult to initially diagnose. cly3 why??

[@TimmyTheToolman]

That's interesting. Thanks for sharing. Don't know why it would be cylinder 3.

[@delmarcardona4692]

Thanks Master. You are a pro my respect to you!!

[@TimmyTheToolman]

Thanks. We appreciate the kind words.

[@SavNout01]

Timmy, have you checked the wires from the coil pack? You might have a crack in the signal wire going back to the ECU

[@TimmyTheToolman]

We figured the cause of the misfire. It was gross play in the crankshaft that most likely caused the knock sensors to signal the misfire to the ECU. His engine had an audible knock and we finally figured out the cause. Check out the video: kzbin.info/www/bejne/b3jTlaRjqbFqb7c

[@burgostommy1987]

Really good blessed 🙌

[@TimmyTheToolman]

Glad you like it.

[@FonzoCapone]

Wouldn’t it be easier to put the fuel injector in first and then the rail?

[@TimmyTheToolman]

Not sure. Give it a try and let us know.

[@charlesrussell7090]

great instruction and detail.

[@TimmyTheToolman]

Thanks Charles. We're glad you like it.

[@GlorifiedPizza]

Praise be to thy holy Timmy (& Sean).

[@TimmyTheToolman]

Glad our video blessed you.

[@ramonnieves8589]

Can you replaced the pressure regulator without taking all that comp. Thank you for you help

[@TimmyTheToolman]

Don't know. We've never tried. With the plenums in the way, it would be hard to get back there with a ratchet or wrench to get the fuel pressure regular unbolted from the fuel rail.

[@ramonnieves8589]

@@TimmyTheToolman thank you for you help love you chanel good teacher

[@TimmyTheToolman]

@@ramonnieves8589 You're welcome Ramon. Good to hear you like our channel and thanks for the nice compliment.

[@DougHinVA]

he is METHODICAL...

[@TimmyTheToolman]

Yes, some would call it OCD. With this type of work, methodical is a good way to go so you don't make a mistake and then have to figure out where you went wrong when things don't turn out the way you hoped they would. Thanks for the comment.

[@Todd_Monson]

Nice job. How long would this take if you were not filming?

[@TimmyTheToolman]

I'd say around 2-3 hours taking your time. If you're comfortable removing the plenums (say you've already removed them to do the valve cover gasket job), you should be able to get things torn down pretty quick. The most time consuming thing for us was figuring out how we could actually torque those 17mm fuel rail bolts. Torquing those to the proper value is nice but I'm sure you could just tighten them by feel with a long 17mm box end wrench and be totally fine too. Since I had the crow foot wrenches, I decided it would be nice to show it's possible to torque them to the proper value provided you had the right tools for the job.

[@Nacho2034]

I changed my fuel filter and now I’m getting a misfire code p0304. The #4 has spark but I think it might be clogged. I changed the plugs but no change. I just put some sea foam injector cleaner. if that doesn’t do the trick is there anything else I could do to avoid opening her up? Thanks for the video.

[@TimmyTheToolman]

Try swapping the wires to see if the misfire follows the wire. If the misfire stays the same, try swapping coils and see what that does. You could do a compression check too before digging in to access the injector.

[@richardramos1821]

Hey Tim , when you tighten fuel rail bolts . I noticed there’s holes inside them , do they have to line up ? Or when you torque them down they line up ?

[@TimmyTheToolman]

Don't worry about the holes in the banjo bolts lining up. I'm assuming when they are torqued to spec they line up properly. The most important thing is to get them torqued properly with NEW gaskets (washers - Toyota part # 90430-12026) so you ensure a leak-free connection when you're all done.

[@danielcecena15]

Nice video

[@TimmyTheToolman]

@@danielcecena15 Thanks!

[@bigpedulla]

Thanks!

[@TimmyTheToolman]

You're very welcome! Thanks for the tip!

[@pobrichi]

How bad is it if I don’t use a torque wrench to put everything back together to spec?

[@TimmyTheToolman]

Not bad. If you know how to tighten things properly based off the size of the fastener, you should be fine. I wrenched for a lot of years and never used a torque wrench. When I did the valve cover job on my 2000 4runner, I didn't own a single torque wrench.

[@pobrichi]

Timmy The Toolman sweet, thanks, putting my ‘96 5VZ-FE 4R back together with new injectors as we speak!🤞🏼🙏🏽🤞🏼

[@TimmyTheToolman]

@@pobrichi Good luck finishing the job. Let me know how it went for you.

[@pobrichi]

Took me 3 days, but she is purring like a kitten on my first try! ...it’s been so long since I’ve seen the display without the CEL flashing at me about the imminent danger of catastrophic failure. Thanks for having my back, knowing you were there with your quick responses helped give me the confidence to push through the many moments of doubt!

[@TimmyTheToolman]

@@pobrichi Great job getting it done. I think you're learning that auto mechanics isn't as hard as we think it can be. With the right information, the right tools, and some patience, you can tackle most of your own work. It's nice to hear our video and prompt responses gave you confidence to succeed with this repair. We appreciate you taking the time to share your success story with us. Happy Wrenching Brother!

[@jerrykraus3621]

Hi Tim, I heard that if your 3rd gen T4R is supercharged and you want to upgrade the pulley on it, that you also need to install upgraded fuel injectors; is this true please?

[@TimmyTheToolman]

That is generally true, yes. You’re already forcing more air into the system without adding more fuel which means your ecu may not feed your engine enough fuel to compensate effectively running lean which in some cases could cause pinging which is not good for an engine long term. So by adding a smaller puller you’re adding more forced air (more boost) exacerbating your lean issue. The only way to compensate is to add more fuel and so the URD 7th injector will do this for you and/or a methanol set up will also allow your air fuel mixture to be safer for increased boost/throttle input.. - Sean

[@jerrykraus3621]

@@TimmyTheToolman Thank you, would replacing the injectors with upgraded ones also help with a smaller pulley or only 7th injector & methanol? If upgraded injectors would help, do you know the part numbers or an online source please?

[@joshualiddell7166]

for some reason I missed all the part numbers and contact for the injector service, you did not list them like you did in your other videos in the beginning or end

[@TimmyTheToolman]

Check the video description. It's all there. Going forward, always check the video description because we give helpful information like part numbers, torque values, links to helpful tools and helpful tips not covered in the video. Also, check for a pinned comment because we quite often update the job by sharing things we learned after we filmed it.

[@levicenteno2353]

Hey Timmy, if I just resealed the engine (valve cover gaskets, seals, plenum gaskets etc) should I replace the plenum gaskets again for this job.

[@TimmyTheToolman]

No, I wouldn't bother replacing plenum gaskets if you recently replaced them.

[@kimchee94112]

Is here a separate CA emission requirement for fuel injectors? Hate to buy he wrong one then won't pass smog.

[@TimmyTheToolman]

No there isn't.

[@kimchee94112]

@@TimmyTheToolman Thanks for the replay!

[@TimmyTheToolman]

@@kimchee94112 No problem

[@felixvelo]

Another informative video. Thanks

[@TimmyTheToolman]

We're glad you think so. You're welcome and thanks for taking the time to comment.

[@kenk3102]

Great video, Tim....gives me the confidence to do this myself if and when the time comes......gonna ask a stupid question, because I really don't know the answer.....why such an elaborate 2-piece plenum with 6 individual channels to funnel air to a common intake manifold?....is it to cool or heat the air before it enters the intake manifold?....trying to learn as much as I can about this 3.4 V6 on both my 2000 4Runners....luv the motor and the truck....keep the videos coming !

[@TimmyTheToolman]

Hey Ken, glad you like the video and it gives you the confidence to tackle the job yourself. You're question isn't stupid at all. It's actually something I've never thought about and I don't know why they designed the air intake system for this engine in that fashion. Now you've got me curious. If you're a member of T4R.org, ask this question in the 3rd Gen section and I bet somebody will have some insight into why it was designed like that. If you get a definitive answer please get back to me and let me know.

[@shaneintegra]

Did that end up being the problem?

[@TimmyTheToolman]

No, it didn't. The reason for the misfire ended up being an issue with this crankshaft. His engine had an audible knock to it and we suspect the knock sensors were triggering the misfire. Check out this video: kzbin.info/www/bejne/b3jTlaRjqbFqb7c

[@gummybear916]

Question for you, Timmy. My 4Runner seems to stumble randomly when cruising on the highway at 65 to 70 mph, and I’m wondering if it could be the fuel injectors? It seems to be very intermittent and doesn’t always do it. I’ve replaced the fuel filter (OEM), cleaned the MAF sensor, and it has new NGK plugs and wires. Have you heard of this issue before? What could be the cause? Thanks!

[@TimmyTheToolman]

I think partially clogged injectors could cause a performance loss. Would it cause the engine to stumble? Hard to say.

[@gummybear916]

@@TimmyTheToolman thanks for the reply. there doesn’t appear to be any performance loss, as it doesn’t occur during acceleration; only while cruising at highway speeds. I’m sure the fuel injectors could use a rebuild/replacement but maybe that’s not the cause. There is no CEL, making this one difficult to figure out. I’m at a loss for now.

[@TimmyTheToolman]

@@gummybear916 I'm not sure where to look either. Maybe post this question on T4R.org in the 3rd Gen section and see if anyone has some insight for you. Good luck!

[@Xantylon74]

Very nice! Was the problem fixed?

[@TimmyTheToolman]

This did not fix the issue. The issue he had was due to work thrust washers and basically the engine needed to be replaced or rebuilt. The worn out thrust washers allowed the crank pulley to move back and forth tricking the engine into thinking it had a misfire.

[@Xantylon74]

@@TimmyTheToolman Oh that's sad. And changing the thrust washers?

[@TimmyTheToolman]

It’s not that easy and could have caused other damage. We would have needed to remove the engine

[@mdgardner70]

@@TimmyTheToolman I think that’s the common result with the #1 cylinder misfire. I saw another video of someone dealing with the exact same problem and result. Seems he was able to fix it in the vehicle thought. I’ll have to try to find it.

[@TimmyTheToolman]

@@mdgardner70 You could do it with the engine still in but you'd have to remove the front differential so you could drop the oil pan.

[@spago555]

Hi Tim, hope you are well - great video as always. My 5vzfe is blowing black smoke when I give it the beans. What do you think is the issue? Are bad/sticking injectors a possibility? Given that I have a JDM OBD-1 ECM, I cannot run a diagnostic tool for insight into the problem so I don't have much to go by. Thank you.

[@spago555]

P.S. I should mention that I run it catless.

[@TimmyTheToolman]

Black smoke usually means your engine is consuming oil. Have you checked your engine oil level?

[@spago555]

@@TimmyTheToolman thanks for your response. The oil level does not drop between oil changes and I am sure it's not burning oil because I can smell the unburned gasoline in the exhausts.

[@TimmyTheToolman]

@@spago555 Ok, I don't know what the issue could be. Maybe your engine is running rich. with the Cat removed, do you still have the upstream and downstream O2 sensors in the exhaust? On 96-98 rigs, the upstream and downstream sensors were both O2 sensors. On the 99-00 and being California spec rigs, the upstream was an Air/Fuel sensor and the downstream was an O2 sensor. Without those, your rig won't be able to make accurate adjustments to the air/fuel ratio.

[@spago555]

I did not know about both upstream and downstream being O2 sensors. I only have the upstream sensor. The black smoke is apparent much before the engine goes into closed loop it may not be O2 related. I think the prime suspects are MAF and/or Injectors. Does this seem like symptoms of old injectors that are spraying too much fuel?

[@terrywbreedlove]

2011 2.7 liter Tacoma, 15,000 miles. Rough cold start but smooths out. Code P0300 I put new plugs in and gas cap but no help. Thinking maybe possible fuel injectors need replacing any thoughts ?

[@TimmyTheToolman]

Any smoke on that cold start? Are you losing any coolant?

[@terrywbreedlove]

@@TimmyTheToolman No smoke and coolant good.

[@TimmyTheToolman]

@@terrywbreedlove There's a lot of things that could cause this issue. Did you do any recent work to the engine?

[@terrywbreedlove]

@@TimmyTheToolman no work done on it and it runs fantastic after that first few seconds on a cold start. I just went down town was in the store a few minutes. Came back started up like a champ and runs smooth at idol and driving. Makes me thing the fuel is leaking from the injectors or not keeping pressure sitting to long. Because as soon as I rev it a little it clears right up from the cold start stumbles. And during normal driving and shirt off times there is still plenty of fuel to start up smoothly.

[@TimmyTheToolman]

@@terrywbreedlove Yeah, it could very well be a fuel delivery problem. Maybe check fuel line connections from the tank all the way to the engine and see what you see. The fact that it's only on a cold start does support your thought that the fuel pressure is lowering after the rig sits for a while but then is fine once it runs for a bit. Maybe try this: On a cold morning, disconnect your coil packs and pull the EFI fuse and turn over the motor for a bit. If your theory is correct and it's a fuel pressure problem, turning over the motor for a while will build back up the fuel pressure. Now reconnect your coils and plug the EFI fuse back in and see if it starts and runs perfect with no rough idle. If the idle is smooth, you now know you need to look for a connection where you're losing the fuel pressure.

[@Qmedjoe]

Tim, I have an ‘03 Tacoma and my next mod I’ll be installing a s/c and 7th inj. Kit. Are there better Toyota injectors that I can install for better flow? I think I read on TW a while back, a guy used Lexus injectors?

[@TimmyTheToolman]

I haven't heard of people running different injectors but that doesn't mean somebody hasn't done it. There's a good thread on T4R.org that covers anything and everything regarding the supercharger upgrade. Maybe you can find your answer there. If you don't find the answer you're looking for, you should ask it and see what the experts say. www.toyota-4runner.org/3rd-gen-t4rs/146022-3-4l-trd-supercharger-thread.html

[@Qmedjoe]

Timmy The Toolman Thanks Tim, I’ll look a little more into it.

[@tsnell2028]

Hi Tim, can warped rear brakes cause misfire problems on Toyota T100

[@TimmyTheToolman]

Well, brakes have nothing to do with the engine, so the answer to your question is No. Plus, your T100 has drum brakes in the rear. Some people think disk brake rotors can warp but that's a misconception. The rotors don't warp. What makes the brakes shudder is uneven brake pad deposits on the rotor.

[@ocoutdoors2355]

Hey Timmy, my 5VZFE stutters slightly off the line and badly at 50mph @ 2K RPM. Perfect when slower or faster than 50mph. Feels almost like lugging a dirt bike in too high a gear. No engine codes. IAC was replaced 1yr ago along with cleaning MAS Sensor. Plugs, wires, coil packs and injectors are original. Any advice???

[@TimmyTheToolman]

I'd start with plugs and wires because you're way overdue to replace them anyway. You're probably overdue for a fuel filter replacement also. We've got a video for the fuel filter replacement: kzbin.info/www/bejne/rJWnmYuQfthpgtE If none of the above helps, I'd then look at getting some injectors and buy from Motorwest Performance. We link their injectors in the video description.

[@ocoutdoors2355]

@@TimmyTheToolman Hey Timmy, I’ve got new injectors from the recommended place in LA, wires and plugs. Going to keep coil packs for now and replace if issue persists. Fuel filter is only a year old. If none of this fixes it, my next place to look at is fuel pump/sending unit. It doesn’t act fuel starved at start up so I’m thinking it’s not the issue. 3rd is maybe check ATF fluid level- maybe there’s a weird hydraulic shift thing going on in a certain gear??? Idk hope it’s not that

[@TimmyTheToolman]

@@ocoutdoors2355 Good luck with the job. Make sure you have new washers for the fuel rail banjo bolts. Definitely make sure your ATF level is correct. That's a no-brainer. Check it on level ground with the engine running. Make sure it's at the right level based off the temp of the fluid.

[@ocoutdoors2355]

@@TimmyTheToolman sure thing. Will do. I ordered the 6 aluminum crush banjo washers from LA place and all new gaskets. Also got new fuel reg o ring. ATF hasn’t been an issue for 2yrs but worth a check if not fixed.

[@TimmyTheToolman]

@@ocoutdoors2355 Ok, Good Luck!

[@greenbastard4586]

2002-2004 have obd2 reader under dash by drivers right knee

[@TimmyTheToolman]

The OBD reader port is different than the diagnostic port.

[@johntyburski531]

Just want to drop a comment on the throttle body gasket. For some 2002-2004 3.4L 4Runners, Tacomas, and Tundras, the part # is: 22271-62050. You can verify any vendor's catalog to make sure that you have the right parts for your particular vehicle at parts.toyota.com.

[@TimmyTheToolman]

That's interesting with the different part numbers because even though 01 and 02 4runners and later model 1st Gen Tacomas have a different throttle body they should all use the same throttle body gasket. The upper plenum is the same on any year 3.4 liter V6 so I don't know why they would list a different part number. The big difference with throttle body gaskets is when somebody has a supercharger and then the entire circle is open to let more air pass through the throttle body and not partially blocked by the gasket.

[@key-bn1xx]

Couple days ago i drove my car and notice sluggish idling and check engine light on so i had my car diagnosed and it had showed cylinder 4 misfire, so i changed the ignition coil and spark plug and it was still the same...i disconnected the negative terminal for the battery, added one bottle of fuel injector cleaner, waited a couple minutes and connected the battery and started my car, it got better and no check engine lamp...but when idling in park or stopped at a stop light i feel the engine jerk but not as bad as before but when driving everything runs normal, no jerk in the engine while driving and still no check engine lamp...any suggestions on what the problem could be?

[@TimmyTheToolman]

It's hard to say what the problem is because there's lots of possibilities. Have you cleaned your throttle body and IAC valve. The IAC valve controls air to the engine when idling.

[@key-bn1xx]

@@TimmyTheToolman yup, i think i cleaned them out around the summer last year because i had a similar issue but the truck would die at stop lights or would have trouble starting up and at the time i had those issues there was no check engine lamp warning

[@key-bn1xx]

Got the problem fixed but not sure what fix it...i changed the spark plug cables and notice a crack in the intake tube and taped it as a temporary solution and now my truck runs normal again...thanks timmythetoolman and shawn or sean...not sure how his name is spelled

[@TimmyTheToolman]

@@key-bn1xx Good to hear you got it fixed. It would have been nice to know what the fix was but the important thing is your engine is now running better. Good job getting it done.

[@Mattars]

What if my misfires are random cylinders? I have misfires in 1 2 and 6

[@TimmyTheToolman]

Hard to say. Did all 3 misfires start at one time?

[@Mattars]

@@TimmyTheToolman yes. Randomly one morning it started running terrible. If I try to drive it the exhaust backfires like crazy. I've replaced the upstream o2, plugs, swapped coil packs, cleaned/replaced MAF, cleaned throttle body/IACV, cam position sensor, checked ECU, checked grounds, checked timing, looked for vacuum leaks. I cant figure out the issue and its driving me crazy letting my 4runner sit for so long. Initial start up it will only misfire slightly, soon after the check engine light will start flashing and it runs terrible. Sounds like a cammed v8.

[@TimmyTheToolman]

@@Mattars Have you messed with the spark wires at all? Any chance they're routed incorrectly?

[@TimmyTheToolman]

It might be injectors. I know it doesn't make sense, because how could 3 injectors all fail at the same time, but it might just be one bad injector throwing the engine off. See what you think from this forum thread: www.4runners.com/threads/cylinders-1-4-misfire-mystery.18450/ Go to post #9 to read what fixed the issue.

[@pitchforkpeasant6219]

@@Mattars figure problem out yet hopefully? If so what was cause. Did similar stuff to mine and noticed exhaust leak. My exhaust manifold was cracked almost all the way around between cyls no 2&3. Replaced that. But still misfire cyls 1&4. Toyota brand coil packs after several different brands

[@nicholasbeck7670]

Safety Tip: When installing the fuel injectors into the fuel rail, I highly, STRONGLY recommend a very, very light coat of SILICONE grease (use a cue-tip) on the small, upper 0-ring and halfway into the fuel rail opening. (Do not use petroleum-based oil or grease that may eat the 0-rings.) FYI: my official Toyota repair manual says you can lube the 0-rings with gasoline. In my experience, gasoline is way too THIN to lube correctly -- you'll likely deform or damage the 0-ring and have a dangerous fuel leak! That injector needs to slide into the fuel rail nice and easy, and (gently) spin freely without binding. ---> Use a very, very light coat silicone grease. You'll be happy you did.

[@TimmyTheToolman]

Hey Nicholas, what you say makes a lot of sense, but for the video we wanted to follow what the FSM suggested. If I do another injector swap, I'll give your suggestion a try. Thanks for taking the time to share this.

[@dcardenas1661]

I had to redo the job because gas wasn’t a slippery enough lube and deformed the o-rings causing a leak. Used silicone grease the next time and it worked perfectly.

[@tonyrowe1455]

Dielectric grease?

[@philiphusain3923]

Yes, I also use silicone grease on all my orings . Works great !

[@sidneykantor]

I just completed replacing all six fuel injectors, valve cover gaskets (including both rear cam plugs and all four half-moons and PCV valve) and plugs and wires in my 2000 4Runner 3.4 (199,000 miles). First, a huge thank you to Timmy The Toolman! I would have never attempted this work without your videos. I did it over two days and it was a lot of work. I have so much respect for all the mechanics out there who keep the world running everyday. So for anyone wondering these were my truck's symptoms: When starting cold it would start and run fine and I could drive it for hours without any issues. However, if I did a warm start maybe 30 minutes after turning it off, cylinder 4 would misfire badly making the truck barely drivable. At first, the misfire would go away after driving for a few minutes but as the issue progressed it began lasting longer and longer and finally would not go away. I invested in a Bluetooth ODB2 scanner and the ODB Fusion app and was able to monitor and log tons of data and then graph it all in excel. Everything looked normal with the exception of the cylinder 4 misfire. So after cleaning the MAF sensor and confirming all other sensors seemed to be working normally I finally decided to it must be the cylinder 4 injector. The injectors were likely original so I knew they would all need replacing anyway and I figured while I was in there I would do the valve cover gaskets as well which were leaking oil badly. It's running great now! Feels smoother and peppier for sure. So after many test drives today the issue is gone! I'm very relieved. I ordered my replacement injectors (Denso refurbished) from Motorwest Performance. The only thing I can think of is that maybe the injector was sticking but only in the scenario described above. I will say that all of the old injectors looked a little rough. Some issues I ran into: This may be obvious to some but not to all including me...torque wrenches may or may not work in reverse. I assumed it would and while torqueing the 17mm fuel rails I wondered why it was not clicking. I was using an extension in a strange orientation which reversed the direction. Anyway, I figured it out but just beware of this as I could have easily broken or stripped the fuel rail. Also, listen to your intuition. I know what 25 ft. lbs. feels like so alarms should have gone off in my head immediately...but they didn't. The PCV was so old and hardened that it broke and fell inside the valve cover when I was trying to remove it. I had to carefully break it up with a hammer and screwdriver and then I was able to get the broken pieces out. I used those small silicone stoppers to plug the fuel pressure regulator as well as the throttle body coolant lines. As I removed the driver's side fuel rail (with fuel pressure regulator attached with plugged up hose) fuel started spilling out a bit and then I noticed that the yellow stopper that I used to plug the hose was gone and I had 3 open fuel injector ports! Arghh! I figured the stopper just dropped and landed somewhere in the engine compartment but I wasn't sure until I finally found it in the grass! Phew. The moral here is be careful if using them to make sure they are in tight so that there is no chance of them falling out and into an open engine orifice.

[@TimmyTheToolman]

You're very welcome Sidney. Glad our videos helped you get all this work done and your misfire fixed. Thanks for the comment to share your experience. Great Job!

[@jleebuongiorno4134]

Thanks Timmy for another great video! I installed the updated / recommended by Motorwest Performance injectors (blue Denso ones) on my 2001 4x4 SR5 this weekend. Not that it needed it, but I was replacing the valve cover gaskets... so while I'm in there I just went for it. (also it made it pretty easy to remove valve covers without the fuel rails in the way) (plugged all holes etc..) I think I'm OCD I broke out my old engineering calculator from back in the day & did the math for anyone who cares. If you use the 17mm crows foot piece on the torque wrench in the straight configuration, set it to 22 ft-lbs (21.67) .. to actually get the 25 ft-lbs at the fuel rail bolts. (probably doesn't matter much but that's what I did) Anyway in the end, no more oil leaking through my valve gasket onto the exhaust manifold (and no more oil burn smell) And new injectors. Nothing is too good for my rig. I think the joy and satisfaction I get doing the work is sometimes more than the end result when it's all done. Onto the next project. Thanks again Tim. & Sean for all the work man NICE. Social distance? OK twist my arm... 9,000 FT here I come :-)

[@TimmyTheToolman]

Thanks for sharing all of this. That's really interesting to know how much more the torque value changed by having the crows foot extending the length of the lever. I now try to keep the crows foot at a 90 degree to the torque wrench to get an accurate torque application to the fastener I'm tightening. It's good to hear you're enjoying turning wrenches on your rig and our videos are helping you out along the way. Thanks for taking the time to comment. We appreciate it. Happy Wrenching!

[@amh1102]

Hi Tim, Thanks so much for the great videos. As always your videos are always detailed and to the point. Have a 99 V6 4runner and last week I stopped at the store and as I turn the car on , engine started to run rough and check engine light came on. stopped at Autozone and it's P0302 Cyl 2 misfire (injector). Was on vacation for about 15 days and the car sat in the garage, so I thought it may be moisture and put some Fuel injector cleaner and it cleared out the check Eng light and rough idle. Ran fine for a day or so and today , it ran rough for about 5 minutes while driving then smooth out again. OEM Spark plugs and wires replaced from Toyota 2 years ago , I'm going to swap coil packs this weekend and run more fuel injector cleaner to see if it's dirty . If I have to remove plenum, can I just replace 3 drive side injectors for now? I get an error when trying find rebuilt fuel injectors on the ( company you mentioned) website for my car, not sure if they are still in business but I just didn't want to spend $900 for injectors !!

[@TimmyTheToolman]

You could just replace the drive side injectors if you want. I'm guessing that injector company is still in business. Give them a call and ask for help with your order.

[@king49334]

Use air gun blow around before you pull them off the cylinder, your situation is no need because it is clean

[@TimmyTheToolman]

That's a good point. If you blow off the top of the engine with some air, you will limit the amount of loose debris you have to deal with when taking things apart. Thanks for sharing this tip.

[@richfuturebydsk2562]

Thanks a lot 🙏 Much support from 🇿🇦 ZAR- Durban Rich Future by DSK Clothing ❤

[@TimmyTheToolman]

You're very welcome Rich.

[@Georvanovic]

No injector cups on the V6?? You guys need to make videos for us 3RZ owners 😅😭😭

[@pitchforkpeasant6219]

Us 3rz guys get left out lots. Thankfully similar systems at least. Ive even been watching misfire causes on hondas and nissans for clues

[@TimmyTheToolman]

Yeah, you're right that we need to make more videos for people that have the 3RZ engine. We lost a valuable resource when our buddy Jordan moved back to Georgia. He's the only guy we've turned wrenches with that has the 3RZ engine.

[@Georvanovic]

@@TimmyTheToolman I wonder where in GA? I live in Loganville, GA

[@TimmyTheToolman]

@@Georvanovic Atlanta.

[@conor1956]

Can not thank you enough for this video. Been chasing down a really bad misfire in my 98. Only got one code in the beginning for #5 cylinder. Tried swapping parts to see if it follows but the code never came back. Starting replacing plugs, wires, coils, and found this video. Got the fuel injectors from motorwest performance it absolutely solved it. Would not of been able to complete this or even know about these injectors other than very expensive oem ones. Most definitely owe you guys a beer next BBQ event! SicMods!!

[@TimmyTheToolman]

I'm stoked to know our video helped you out. Thanks for taking the time to comment. We'll be having another Sic Mods BBQ in early July. If you're subscribed and receive notifications, you'll see our video invite.

[@pitchforkpeasant6219]

Misc colored electrical tape works great for “labeling “. Did electrical for awhile so have regular width and skinny for “labeling” tons of wire, hoses, or whatever

[@TimmyTheToolman]

That's a great tip. Thanks for sharing.

[@darrellmorse9224]

Good Job; but there is one small detail that was overlooked. That plate on top of the throttle body with the 4 tiny screws should be removed and cleaned. What happens, as I found out on my 2001 4-runner, is that there is a 'carbon mound' build-up on the bottom of that plate over time. It may not have an affect on performance, but it's a good idea to clean it, as it doesn't get cleaned when a throttle body cleaning is performed. The holes leading down to the throttle plate are very tiny. Just a suggestion!

[@TimmyTheToolman]

Hey Darrell, are you talking about cleaning the IAC or is this something entirely different?

[@darrellmorse9224]

Yes, I think that's what it is.

[@ahmedkunbargi8096]

@@TimmyTheToolman Im in the middle of this job right now. Should I remove my IAC and clean it? GREAT video. good looks

[@TimmyTheToolman]

Ahmed Kunbargi be careful when cleaning the IAC, remove it and turn it upside down so the hunk you’re cleaning out doesn’t fall back into the areas you can’t see. Cleaning it can actually make it worse so be careful!

[@MotoDUDEabides]

Great vid as usual. I’m a former Toyota tech… I don’t know any tech that torques any of those fuel line bolts. Good on you!

[@TimmyTheToolman]

Thanks for the compliment. I appreciate it. Sean and I try our best to do things like the Toyota FSMs instruct us to do, but sometimes we use the German Spec of Gudentite and go by feel when tightening fasteners.

[@jimmyaab]

Timmy, hi, thanks for your videos very useful, I'm planning to buy a 4 runner and I was wondering what to look on them when checking them out, like whats the most common problems this trucks have and what models to avoid, thank you again

[@love2hvac]

Thank you for this I was able to diagnose this problem with my Tacoma. i ordered a set of matched injectors from Motorwest and used this video with the valve cover video and did both at the same time. Really helpful! The motorwest injectors look completely different from the injectors I took out, I suspect they had been previously changed. Probably the reason for premature failure. The truck only has 50K miles. Hopefully I should be in good shape for a long time. The truck has so much more power! runs so smooth now! I now have a high idle issue to find.. Never ending

[@TimmyTheToolman]

Great to hear the injector swap worked to fix your misfire issue. Your high idle problem may be an issue with your IAC (idle air control) valve or an issue with your TPS (throttle position sensor). I’d try cleaning your IAC first. If that doesn’t do it, maybe test your TPS to see if it’s bad. We unfortunately don’t have videos for this but I’m sure the information you require is out there. Also check for vacuum leaks.

[@dsa420meh7]

I'm also going to do valve cover and get the injectors cleaned at the same time! seems like the way to go. I'd be curious how it will improve mpg with fresh injectors

[@AntonioClaudioMichael]

I did all this on a 2000 4runner a year ago didnt record it but nice video bro

[@TimmyTheToolman]

Thanks Antonio. We're glad you liked it. Sean and I have pretty much figured out that filming makes a job take at least 1.5 times longer. It can be frustrating because I just want to keep the wrenches turning but I have to wait until we get the camera at the right angle, make sure the lighting is sufficient and then I have to figure out what I want to say to describe to the viewer what I'm doing next. We know people appreciate it so that's why we do it. Thanks for taking the time to comment.

[@AntonioClaudioMichael]

@@TimmyTheToolman your very welcome bro I filmed an entire suspension overhaul few weeks ago took over 4 parts to complete the video over 2 and a half hours in total I totaly get it bro

[@TimmyTheToolman]

Yeah, I guess you do get it. Let me know when you post the videos and I'll check them out.

[@AntonioClaudioMichael]

@@TimmyTheToolman I already did post them

[@TimmyTheToolman]

Gotcha. I'll check them out.

[@benwright7977]

Your videos are awesome and such a help when working on my 01 4Runner. Could you guys possibly make a video for replacing a break master cylinder and hydraulic break booster pump? There are no videos for this on you tube. You guys are the best and I will keep watching for new upgrades. Thanks a lot guys.

[@TimmyTheToolman]

Hey Ben, glad you like our videos. That brake master cylinder on the 01 and 02 models is supposedly very expensive to replace. The obvious choice is to try to find a used one off a wrecked 3rd Gen at a PickNPull but I think the word is out on how valuable those master cylinders are and people snag them super quick. The only way for us to make a video of this is to find someone who needs this repair and they want our help. I imagine there's a good chance we will make this video one day, but when that is, who knows.

[@oomar3450]

Great video. I just finished the job, but I found that seating the fuel injectors FIRST then the fuel rail was the ticket for me. If you think about it, you have 3 O rings to overcome on each injector, if you seat the injectors first that leaves the upper O ring. The gas lubricant facilitated the bottom 2 O rings ( the gas did not evaporate as quickly as it did wrestling to install the 3 O rings in one fell swoop. Think of it as a 2 step procedure, first the bottom, then re-lube the top O rings with gas and work the injector back and forth until it slips on - easy.

[@TimmyTheToolman]

Glad you like the video. I can get behind your technique of getting the injectors in. Whatever works. Happy Wrenching!

[@dinch_art]

Wow is all I can say. Your videos helped me get new valve cover gaskets and new fuel injectors from MotorWest into my engine. Took my time and got all the correct OEM parts. I learned a lot and want to say thank you for your time and effort you put into these videos that let us tackle these projects with confidence! P.S. Also I love your little jokes you fit in here and there haha!

[@TimmyTheToolman]

Great to hear you're making good use of our videos and you're learning a lot. Also nice to hear you appreciate the little jokes I throw in. Not many people mention that. Good to know I'm not the only one laughing. You're very welcome and we appreciate you taking the time to comment. Happy Wrenching Dave!

[@JnIII16]

Use Timmy's videos all the time to work on my 1999 3.4...Had an issue with the injectors (cold start fine, terrible idle, codes P300/P0303 when warm and during warm restart). Contacted Martin at MotorWestPerformance, pleasure to speak with and after purchasing the upgraded Denso injectors this 3rd gen runs lke new (just hit 205k). Thank you Timmy, Martin and everyone else involved in these videos!

[@TimmyTheToolman]

You're very welcome. Great to hear our videos are helping you out. Happy Wrenching!

[@alejandroballista1771]

Just saw a couple of your videos and learned how remove the throttle body and check and clean the IAC Valve. Thanks for the great video.

[@TimmyTheToolman]

@@alejandroballista1771 You're welcome. Good job doing your own work. Happy Wrenching!

[@zloutlaw8286]

Timmy is always my go to Guy for any 4runner how to.. I will be tackling this same job this Wednesday. I am fighting a P0171 lean code on my 98 3.4 with 604,000 miles on it. I've ruled out any vacuum leaks, cleaned my MAF sensor and also pulled 2 MAFS from a u pull it lots and compared the numbers and all 3 are the same. Since Toyota no longer makes it I did try a aftermarket one first and my truck wouldn't even start with it. I've replaced both upstream and downstream 02 sensors with still no luck. Even after resetting the ECU after each attempt my fuel trims are way off LTFR 19% STFR 0% I get a stumble and very rough idle ONLY when the engine is hot and just restarting or at idle that smooths out shortly there after. I am replacing all injectors Wednesday and the fuel pressure regulator in hopes to sort it out. I bought all rebuilt denso Injectors and got my FPR from Toyota. Fuel pump assembly was replaced 2 months ago.. I'm not sure where to go if he injectors and FPR do not fix it. Timmy's videos are most informative and education. A+ on the fuel rail 17mm bolts is the torque spec 25 ft lbs or in lbs???

[@TimmyTheToolman]

Glad you find our videos helpful and good luck with the fuel injector replacements. The fuel rail banjo bolts are 25 foot pounds. 25 inch pounds is basically nothing like hand tight. Hope the fuel injectors and fuel pressure regulator fix your issue.

[@TyMan970]

Tim, Thank you for doing these videos!! I have been watching for years now and you helped me so much on my 03 Tacoma. You are the 3.4 legend. I recently bought a 1999 4Runner CEL codes come up with , Cylinders 1, 3 and 4 misfire. New plugs, wires , coils. I’m about to put in new injectors . Did this fix the problem for this runner? I don’t see the pinned comment you said you would put up. If I did not what is the next step????? Again thank you 🙏 please keep it up.

[@TimmyTheToolman]

Hey Ty, great to hear our videos have been helping you out for years. The injector replacement on Greg's engine didn't fix his misfire issue. His problem ended up being gross play in his crankshaft. Check out the video: kzbin.info/www/bejne/b3jTlaRjqbFqb7c It's hard to say if your issue is an injector problem with 3 misfires going on.

[@Nacho2034]

What happened with your misfires?

[@pbr549]

Great video! Many thanks! I had to do it a second time. Unfortunately injector number 6 leaked. I pulled the diver's side rail install 3 new O-rings on the upper end of the fuel injector. New crush washers on driver's side rail. I ran it on idle for 40 minutes no leaks will drive it in the morning it's cooling down now. Tim thanks again and take care.

[@TimmyTheToolman]

Dave P. Thanks for stopping by & sharing your experience! We are glad our videos are helping you fix up your rig.

[@randyroth383]

I just want to add a comment i have a Tacoma 2000 2.7 4 cylinder TRD i was replacing 02cencers like once a year thay were black sooted up the tell pipe was black soot also i used lacquer thinner 1 gallon to 9 gallons of gas ran it out in 3 hours i seen in provment in the first 10mins ran the gas mix out filled tank back up after is been 4 years now truck runs nice still no more 02cencers have to buy im sureit cleaned the cat also 👍 with the brighter burn. The corn gas with 10% will make them stick open ill never buy the stuff at the parts store for cleaning fuel injectors is crap in my eyes 🙋 take care friends for got to say i ran the truck on the interstate 65mph stop n go traffic took to long 😁👍

[@TimmyTheToolman]

Thanks for sharing Randy! 💪🏼

[@citizen_or_civilian]

Turns out I'm going to have to re-use those aluminium washers for the fuel rail bolts... Would over-torquing by a few in-lbs. be a good idea since they're designed to be deformed upon tightening?

[@TimmyTheToolman]

Just get them tight and hope they don't leak.

[@clv_23]

I received a 3rd cylinder misfire code on my 2.7 Tacoma. I swapped out all the injectors and now when I start it it immediately revs up and doesn’t come down. Not sure what’s wrong. Any help is appreciated

[@TimmyTheToolman]

Sounds like you might have a vacuum leak. Recheck your work.

[@WaikoloaBermudez73]

Thanks for the very informative video. All the details you provided helped me successfully replace the injectors in my Tacoma. The only problem I encountered which you didn’t have was my old injector cups separated and were stuck in the bores.

[@TimmyTheToolman]

You're welcome. We're happy to know our video helped you swap out your fuel injectors.

[@waynebrowning3416]

Excellent instructions, followed step by step. Currently doing this but had to pause to get new connectors for the fuel injectors because they were so brittle a couple broke when disconnecting. Doing this on a 97 4runner and found the ohms value on 1 injector way high. ----> Let's shut down the torque police before they can come out. I am a mechanical engineer and work as a manufacturing engineer making transmissions. Using a crows foot at any angle will change the torque value because it changes the leverage arm or length of the wrench. How much, well it almost can be ignored since all torque values have a tolerance range. With the crows foot at the maximum length which is inline with the wrench it increases the torque about 1 in-lb so you reach 301 in-lbs instead of 300. Also due to the clearance issue you are rubbing the wrench against either the timing belt cover or wiring harness which increases the torque. How much, not enough to worry about. Bottom line you can set the crows foot at any angle that allows you to get it on the fastener and you will still be withing the correct torque tolerance.

[@TimmyTheToolman]

Thanks for the compliment and the instruction on torque.

[@tomm2271]

Hello- 2007 Corolla 1.8 4 cyl Just turned 34k. (Purchased from Elderly women, didn't drive much) Showroom cond., no codes, runs great.. except: the engine has an occasional "hiccup" "miss" hesitation....hard to explain, but mainly when its cold. You may only feel it 1 to 5 times during warm up. -Due to age , we did put oem plugs in Also- -new intake manifold gasket (oem orange upgrade) -new maf sensor -cleaned throttle body and blade -checked for vacuum leaks -ran a bottle of gumout (with p.e.a.) in last tank full Can you think of anything else I could try? I know this engine is one of the best built and should not be doing this as infrequent as it is. Replace injectors? Thanks! Tom

[@TimmyTheToolman]

I know the hiccup or miss you're talking about. My 3.4 Liter V6 does it too. I wouldn't worry about it. I think it's completely normal.

[@jcantavella]

After following your directions on this carefully I replace my injectors with the ones you recommended. Now I have a slight knocking/misfire. Haven’t pulled a code yet. Any ideas?

[@TimmyTheToolman]

Don't have a clue other than retracing your steps. Are the electrical connections at each injector good? Fully connected, where you hear it click and you can't pull the connector off? Did you disconnect any spark plug wires or coil packs while doing this job? You need to go back through everything and double-check because something isn't right.

[@SteezerZimmer]

@TimmyTheToolman Once again another great video and you have helped so many people, really appreciate it. I am going to tackle this job in conjunction with my valve cover gaskets. do you have any recommendation as to what order to do the 2 jobs in? as in fuel injectors before I remove the valve cover? vice versa? Thanks!

[@TimmyTheToolman]

I don't think it matters which one you do first. I just wouldn't do both at the same time because you wouldn't want to drop anything into the valve train area while working on the injectors. You might want to consider checking your valve clearances while the valve covers are off. We have a video for it. Good luck with both jobs. Happy Wrenching!

[@Sami-bc9iv]

Good job. Here's a link on How To replace Intake Manifold on Toyota 4Runner that documents many of the steps: www.howtorepairguide.com/2012/03/how-to-replace-intake-manifold-on_28.html I followed your video to replace the fuel injectors. Going through your video was extremely helpful. Great job as usual. I got the injectors from Motorwest Performance (thanks for the recommendation). I also determined that one of the coils was causing the misfire. I am replacing all three along with the gaskets, O-rings, fuel filter, O2 sensors, and cleaning the IAC (which you have other videos on the topics as well !!!!). - To depressurize the system, I pulled the EFI fuse and ran the engine until it lost fuel pressure (Per the comment from another viewer). It worked!!!!. - Regarding the Crowfoot wrench, I agree, it should be at a 90-degree angle to torque the bolts. P.S. There are other ways to clean the fuel injectors for example using the OTC tool or similar ones ( kzbin.info/www/bejne/mHyqemyElN6KmpI ). Have you tried this method?

[@TimmyTheToolman]

Thanks for the comment Sami. Since making this video, we now have a 4 part video series for replacing a 3.4 liter V6 engine which includes the entire strip down of the old motor and build-up of the rebuilt motor. Here's a link to Part 1 of that series: kzbin.info/www/bejne/ZnbXi6Gnr6-bf5Y So, instead of a write-up, you could have watched us strip down the old motor to learn how to remove the intake manifold and then watched us build up the new one to learn all the steps and proper torque values to get all the component back on. Write-ups are good, but in my opinion, videos are much more detailed and informative. That's interesting pulling the EFI fuse worked to depressurize the system because pulling that fuse kills power to the injectors. So, they're not going to fire and reduce pressure in the fuel rails. But, if it worked, it worked. I've never tried to clean my own injectors. Maybe you can clean them but companies like Motorwest Performance also check the ejection values and make sure all your injectors are matched. This is something a DIYer can't do at their home. I think having them professionally serviced or just buying replacement injectors from Motorwest is the way to go.

[@GyvesHD]

What ended up being the issue since the injectors didn’t fix the issue. I’m having a misfire issue and I’m hoping it’s a injector. Already changed plugs coils and wires.

[@TimmyTheToolman]

It was crankshaft play causing an engine knock that we suspect the knock sensors were picking up and registering the misfire. We document the play in this video: kzbin.info/www/bejne/b3jTlaRjqbFqb7c

[@superdave4543]

I've had a fuel injector o ring spray fuel after install. I didn’t replace the o rings at first. Highly recommend new o rings if you remove injectors for any reason.

[@TimmyTheToolman]

Good advice.

[@Salve_Regina8]

Tim and Sean thank you both for taking the time to make these very detailed and informative videos. I appreciate it. Thanks to you I've gathered the courage to do this on my own. I'm going to do Valve cover gaskets, all fuel injectors, all coils and plugs, wires, half moons, cam plugs, pcv valve, fuel regulator, and every gasket that's involved in the process. I can't wait. One question Tim, what is a good scanning tool for a 2002 Tacoma 4x4? I have zero knowledge on scan code readers. I want to add one to my tool box. I'd like to hear your opinion on that. Thanks again!

[@TimmyTheToolman]

Hey Rafael, it's great to hear our videos are giving you the confidence to handle these jobs on your own. That's awesome! For a code reader, I use the Torque Pro app on my Android phone and the information is sent via a Bluetooth OBD II reader. If you click on this video link: kzbin.info/www/bejne/iKbQgYufq6efoZo and open the video description, you'll see links to the OBD II reader and also a link to a shut-off switch. If you have an iPhone, that reader won't work and you'll have to get one that's compatible with iPhones. You'll also have to download an app that will work with iPhones. If you have an android, you just copy me and you'll have a good reader at your disposal as well as real time information you can monitor like coolant temp, trans temp (99-02 models), charging volts, etc.

[@rickmeadows686]

Always use a brass, aluminum or plastic pick to remove “O” rings as not to scratch sealing surface.

[@TimmyTheToolman]

Thanks Rick. You gave me a reason to buy more tools.

[@rickmeadows686]

Timmy The Toolman You are welcome.

[@nickschuldt9229]

Hey Tim it's Nick from New York, I'm stuck in South Carolina. Was wondering if you can remove the fuel rails on the 4.7 without taking the intake manifold off, it looks like I can but I don't want to get too far and realize I have to. Thank you.

[@TimmyTheToolman]

Sorry I missed your comment. It was held for review for some reason. I've never tried to replace injectors on the 4.7 liter V8 engine so I don't know for sure what's entailed to get to the fuel rails. I think you are calling the intake plenum on top of the engine the intake manifold. They are two separate things. By the look of it, the intake plenum on top of the engine would need to come off to expose the fuel rails. Did you finally figure it out since your comment is almost 2 weeks old?

[@Georvanovic]

Does the fuel rail bolt have a specific side? I had to unbolt mine (2.7 3RZ 4Runner), and I can't remember which direction the hole it's supposed to go 😓

[@TimmyTheToolman]

The fuel rail bolts shouldn't be side specific. I'm guessing if you held up two fuel rail banjo bolts side by side, they would look identical.

[@robertchinchilla06]

If you have a miss-fire in 1 cylinder, wouldn't the code be for 2 cylinders? we have 3 for our 6 cylinders. Is it possible to lose 1 cylinder with a 1 coil pack out?

[@TimmyTheToolman]

That's a good question. I do think it's possible that the coil pack fails partially and not completely. Say for instance the cylinder the coil pack is on has a bad electrode leading to the spark plug for that cylinder but the electronics sending the signal to the spark plug wire that routes to a cylinder on the driver side are still good. It makes sense to me that they could fail partially but I might be wrong.