How to Replace Fuel Injectors on a 99-08 Dodge Jeep 4.7 & 3.7

This is a fuel injector upgrade by installing Denso 12582704 injectors. How to get more HP and better MPG. The Denso injectors are a 12 hole design. At the end of the video, I also explain how to reset the ECM or PCM to put it into a fast learning mode.
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#martinbuilt #jeepgrandcherokee

[@brucewaldrop2933]

Really enjoy your videos Martin...hands-down some of the best how-to vids on KZbin! I'll be doing this upgrade soon in my daughter's 2002 WJ. Already been to the salvage yard and picked up 12 (few extra just in case) of the Denso injectors out of some Malibus...side note..all of the Cobalts with the 2.2 Ecotec I checked out had a 4-hole injector. I also clipped off a wiring harness that I will modify to make testing and cleaning the injectors a little easier. The rebuild kits are on the way and I will hopefully get this done in the next week or two. My daughter is looking forward to some increases in MPG (currently around 15 mixed driving). Thanks again.

[@dustinnadeau5151]

Just got done doing this on my 04 Dakota! Bro you're the king of these type videos! Every step was clean and clear and easy to follow and made sense! Thanks for saving me a lot of time, money and stress!!

[@martinbuilt]

You're welcome and thank you!

[@MakaylaChildress]

I’m probably doing the same thing today or tomorrow. Hope I’m as successful as you!

[@josephlininger2677]

This guy is awesome. He doesn't forget what's it's like to be new and is patient. Without you I would have been in the dark, thank you !!!

[@josereyes-ki7lp]

Will a tune be necessary to run these injectors or just plug and play ready to go?

[@martinbuilt]

I've had some mixed reviews of using these injectors on a stock engine. I do have a few mods on this engine, and they work well on a stock ECM with no tune.

[@rockymountboy]

I noticed the problem with the metal clips when I replaced my injectors I also noticed how tight the injectors fit into the rail and the heads, and realized that with everything re-assembled, they weren't going anywhere. So I left the clips off. No problems.

[@martinbuilt]

Thomas Maresh yep that will work perfectly fine. Thanks for watching.

[@micheldici2165]

A huge thank you for this video! My jeep GC 4.7 HO 2002 160000km loses pressure in the fuel system, I have already changed the fuel filter and I think there may be a leak on one or more injectors (it smells like fuel)..... Does the 4.7 HO need special injectors? Which ones do you recommend? Well hello from France, fortunately you are here in the US to show us how to repair our machines!

[@jeanmarc6317]

pas de réponse particuliere ,juste pour te dire que je suis comme toi de france ,lyon abonné a martibuilt car c'est le meilleur pour les 4.7l grand cherokee pour ton probleme il ya jean marc de (jeep garage) youtube qui a traité ce probleme sur son 4.7l et qui lui aussi et très bon.

[@RonHinkle-p1c]

Martin I love your videos question I have 02 Overland HO. These Denso injectors they are better than my stock HO injectors?

[@andybilakshow260]

Does this resetting of the ecm apply when swapping motors? I've heard some time back the computer doesn't like them to be swapped. Thanks

[@martinbuilt]

Oh I don't know if it's really necessary but It still may be a good idea.

[@davek2690]

My 07 dakota randomly wouldn't start last friday and after doing a few tests i bought a fuel pump thinking mine was bad but after dropping my tank i found out mine was still working so i tried injector cleaner and my truck started n ran for the past 5 days but today my truck won't start. I don't have anywhere near as much pressure coming out of the release valve on the fuel rail so do you think my pump is failing or could it be a bad injector?

[@martinbuilt]

Sounds like you the fuel pump or fuel pressure regulator could even be a clogged fuel filter

[@stanleywhitt3765]

Do these denso work on the 2006 4.7? Had people say yes and others say no.

[@martinbuilt]

I saying yes they will, where are you hearing other wise?

[@joehernandez1472]

I have a 2000 Dodge Dakota Sport 4x4 with a 4.7 liter engine. Replaced all 8 injectors. This video was a great help, could not have done it without watching it. Keep these helpful videos coming. Thanks !!!!!!

[@dave6135]

the Bob Ross of builds

[@IcTracers420]

Happy little injectors. 👍💨👌

[@neoobi32]

😂

[@nausticaz6845]

Another way to reset the PCM is to disconnect both positive and negative terminals from the battery and touch them together for a couple of minutes. Basically the same as touching the positive to the chassis. We used to do that at at Dodge to clear the "Gas Cap" evap code.

[@thesetruths1404]

Any suggestions what to do next? Thanks! I have a 2007 Liberty 3.7L V6, 117,000 miles. Owned it since 67,000 miles. It operated perfectly for the first 30,000 miles and then it started getting a #1 Cyl misfire code P0301. It also seldomly gets a #1 cyl fuel injector circuit open P0201. It must be a very mild fault as the misfire freeze frame data shows it always happens at less than 350 rpm and when cleared it comes back immediately at next startup, cold or hot. So it seems to only happen once on startup as its moving up to regular idle speed. The miss isnt noticeable when driving or idling. Its getting 15.5 mpg fuel mileage. Doesnt burn oil. Doesnt smoke. Has great power. I've changed plugs and coils but no difference. Cleaned air intake, air filter, and ran cleaner through system. I've cleaned and inspected the injector plug and all wires but no difference. Dry / wet compression test of #1, 3 and 5 cylinders all read good: 160 / 175 psi. I'm wondering if there's a mild wire defect for that injector, or just a flakey connection somewhere. Has anyone tried to use a new set of compatible gauge wires and run them to a place closer to the injector control? I can't see where the wires go though. I'm not sure if I should just live with this, or troubleshoot it more. I don’t care about the engine light as we don't have emission requirements. Now that I know the compression is good, I'm not so worried about it.

[@thesetruths1404]

For my 2007 Liberty 90,000 miles was the Injector electrics. For some dumbass reason I didn't ohm the #1 Injector leads. When i eventually did, it ohmed at 148 instead of around 12.5. So that explains why I had low rpm misfires under 500rpm. Likely upon startups, bc it started and idles fine. Doesn't miss otherwise. Bought reman Denso 6-pack on ebay for $72. I'm just replacing that one Injector #1 bc I'm like that, so I'm gonna try to do that without having to remove anything but the #1 and #3 coils and fuel rail bolts on both sides. Maybe the air intake if necessary.

[@brad3139]

just performed this injector swap on my 2001 durango and im astonished at just how much power this actually added. great video Martin, it was alot of help!

[@martinbuilt]

I'm very glad to hear that. I just love it when a plan comes together.

[@meanstreak8345]

I’m about to do this on my 00 Durango. Did you see a better increase in mpg?

[@brad3139]

didnt have any positive or negative effect on mpg, just woke it up a bit.

[@DownHillgamer]

Damn it made that big of difference? I wana try it on my 2002 Dakota w the 4.7 now, cause I’ve been wanting to squeeze some more power out of her and was looking at throttle bottle spacers and cold air intakes and shit like that

[@brad3139]

@@DownHillgamer id say out of all the mods i did to my 4.7, the ones that made the biggest difference in noticeable power were the HO cams and the injector swap. throttle body spacers and CAI are not going to do anything other than drain your bank account, unfortunately. same goes for a tuner. i noticed little difference over stock with a diablosport. the 2008+ intake manifold swap is also a good modification but theyre getting harder and harder to find and require an adapter for the stock throttle body.

[@Lowdime]

Hey martin, i have an 07 jeep commander 3.7 and it pulsates under consistent throttle at highway speeds and after it gets hot and i shut it off and start it up again it runs rough then agter it sits again for a while i start it and it runs fine. Theres a code for a cylinder 3 misfire. Not sure if its the filter in the tank thats part of the fuel pump, a bad injector, or bad plug. Coils are all new.

[@bigdaddy5150sh71]

Just changed my injectors after watching your videos. It went prefect! Thank you so much

[@null5647]

Great video!!!! Important information was easy to understand and apply. I'm getting ready to replace my injectors for my 2000 Durango. I can't wait to put on the Desnco 12582704 injectors. There are not too many things that can be done to improve the performance of the 4.7 as far as I know, other than the K & N air filter and the E3.48 spark plugs. Looking forward to learning more you! Great job!

[@martinbuilt]

Thank you, these injectors work really well once you add a few mods. I've got some other videos that you'll find have greatly improved horsepower and torque. Thank you for subscribing!

[@mitchwest6453]

PLEASE BE ADVISED, if you can't find this part number, an alternate injector is the 12 hole EV6. Even better, they are directly PnP, no need to modify the fuel rail. Provides the same amount of clearance as the stock injectors.

[@nate4036]

What did they come in?

[@patmaneely5519]

@Mitch West - Do you have a a P/N for the 12 Hole EV6 fuel injectors or the year/engine of the EV6?

[@allensnook7760]

Me too if i want new rather than used what vehicle n yr do i ask for that part?snooky pa.😊😊

[@Countrywild]

I installed a rebuilt engine a month ago and my mpg dropped from 17.4 average to 12. No changes only the engine. Today I completed this mod and BAMMMM 19.3 off the bat. You are the man!

[@martinbuilt]

Thank you , I'm glad it worked out for you.

[@BigWood3131]

Do you realize that the mileage would get better as the motor is broke in and rings are sealed

[@BigWood3131]

@@martinbuilt where can you buy injector rebuild kits and is there a special tool needed to hold the high pressure spring down

[@martinbuilt]

@@BigWood3131 hard time finding rebuild kit for those injectors. My old Rings were in very good condition so I reuse those & the pintle cap. The filter baskets you can use the same ones from a Bosch type injector that was the only thing I actually changed out. O-rings for the Bosch injector will also work. There are no high pressure Springs or anything that's going to come flying apart.

[@israelballew4155]

Really curious who you purchased your rebuilt engine from. Need to be prepared for the worst.

[@hunterchesser9704]

I Need Big Help Martin! I got the 12 hole injectors took them to a injector cleaning machine they were good i installed them in my 06 dakota with the 4.7HO it ran fine the first start, the second time it is burning rich and misfiring very badly and tapping like a lifter tap please help!! I am going to put the old injectors back in and see I disconnected the battery and everything!

[@hunterchesser9704]

I found the problem i broke loose carbon when i did the injector swap and held the valve open momentarily and made the rocker fall out!

[@servantofyahuwah2486]

How about on Hemi 5.7 what part number to use for a 12 hole on the Hemi? Thanks

[@brettsanders8329]

Awesome video man. You’re great at keeping it simple and explaining yourself! Very professional

[@martinbuilt]

I appreciate that, I'm glad you liked it!

[@boblawrence9947]

Martin, Thank you for all the helpful videos you post, they are so appreciated. I have a 2004 Jeep GC with a 4.7 HO motor. I’m rebuilding the motor and planning to use the 2008 intake. In my reading, you mentioned that the Bosch would be best in a non-modified engine, since mine is a HO with the 2008 intake, which injector would you recommend, the Bosch or the Denso? Thanks Again for all you do!!!

[@michaelcovington1844]

Yudamann, I enjoy yurr vids, I just replaced a thrown rocker, I hope yurr happy, yurr a blessing, I truly respect yu, my v8 is nolonger a v7 😂😂😂

[@moparlife1]

great video and well described procedure, tried this mod for myself and did not work as intended.i have a 2005 dakota with a 4.7 and running the ngc pcm. stock fuel pressure is 58psi for my truck.using the denso part number and a donor fuel rail modified to allow rotation of injectors i set on my way with the install.i started with -8% on right bank and -2% on the left bank for long term fuel trims.once the injectors were swapped i performed a memory reset for adaptive to start a new learning process for the newly installed injectors.within 5 minutes checked fuel trims and found -26% and -19%,major difference in fuel flow and thought might be cause i was in idle cell and consuming fuel at idle.drove the truck for 2 days and rechecked the fuel trims and no change. pcm was trying to pull a very large amount of fuel away from these new injector.had p0300 show up randomly but not counting misfires when i was able to check.truck was running ok, no noticeable change in fuel economy or response.refilled fuel tank and set out again thought maybe it would get better.after about a half a tank of fuel truck set right bank to rich dtc.desided to switch back to stock injectors as my truck couldn't adjust to this injector.martin talks about cc rating at 3 bar(43psi) not sure of what kind of jump these injectors make in flow rate at 58psi as the 90$ i spent on used stuff was enough of a loss for me and i wasn't about to send the injectors out for flow testing.just figured i would share my experience. not sure if martin is running a jtec pcm as it runs at 49psi fuel pressure and this is why his outcome was better as the fuel rating would be a lot closer. just wanted to share my experience.great video tho, i have watched many other videos and will continue to watch.

[@richwilson7017]

Same was true with me. If you have 04 or newer with 4 plug pcm your fuel pressure is to high (58psi)to use these. Runs ok but rich. Excellent video by Martin. He is the 4.7 magnum magician.

[@clintstites]

Martin's WJ is an '04 I thought. Does he say which computer he is running?

[@venM9]

@@richwilson7017 I have a ram 05. Installed the 12point and my long trims stay at -20 during idle and my short trims around -2. They go to 0 during acceleration, both long and short trims. My onboard mpg shows around 14.5 mpg compared with 11 mpg as it was before the injector replacement. I dont think I really save that much on mpg in real life, though. Maybe the computer reads the inflow fuel and not the residual outflow from the rails. The truck drives nice with good idle rpm.

[@otorres079]

great content @martinbuilt , do you know if this would work on a 2008-2012 jeep liberty with a 3.7? thanks in advance

[@Floki_mk]

good sir can i just say that you are just great man , ive had a fair amount of issues resolved easily because of your videos and I must thank you for that , keep it up man

[@martinbuilt]

Great to hear, and you are most welcome!

[@jerrodcorey25]

6:01 "WOO HAHA . . . . . . TEXT MESSAGE" LOLOLOL

[@Danielprokopij]

Hey I appreciate your videos and the knowledge you share most of the time. But i wanna let you know that i dont think you are actually getting the milage stated. The computer thinks that is what you are getting because it is decreasing the fuel output because the injector is putting out more fuel then the computer is accounting for. So that is why you feel more power because it uses more fuel. And the computer thinks its putting less which is why it tells you that you are getting better mpg as well. Unless that MPG is hand calculated at the pump after each fill up then that is what must be going on. Let me know what you think if i am missing something! Thanks.

[@martinbuilt]

Alan Thanks for your input, You are most likely right about most of what you are saying. The overhead display is not reporting a accurate MPG, but the injectors that I installed are not using more fuel. The ECM will adjust the timing of the fuel injectors to deliver the proper amount of fuel by shortening or lengthening the amount of time the injector stays open. The 12 hole injectors have a better stray pattern for better atomization which in return should give better performance, MPG, better idle and throttle responce.

[@Danielprokopij]

martinbuilt ok that is understandable so have you taken any mpg readings during fill up to calculate your real mpg? I would be curious to know what you get considering i see how well maintained your jeep is. I just got a 2004 4.7 h.o that needs a lot of maintenance items to get it up to par and i see around 12 mpg for my first couple tanks.

[@johnfeather-o5x]

I have the same jeep as you. I get 13.5 gallons per mile. Would using these help make it better or what would? Thanks

[@gregj.gotham4402]

Ok I’m going to do the fast track learn mode in the late morning to hopefully get a better idel and running smother. New-rebuild engine, HO cams, HO intake, HO spring change over on stock heads, Denzo 12 Hole injectors, cleaned them out.

[@ahankararockband]

Great video, Martin. I have 2000 WJ, but with HO engine installed. We run it on lpg in Poland, because 1 liter of gas costs 1.5 bucks here😉. Cheers from Poland!

[@hyperdukes7860]

Im doing this upgrade as I type this

[@phillanassa759]

So, in your experience, which ones are the best overall match, without the computer getting funky, or setting a CEL? Would you (which would you) recommend for non-modified 4.7's..? Or would adding the HO cam's/Intake/heads work better,.. with which injector? I'm looking to improve the injectors in both my '00 4.7 (vin N) Durango SLT 4X4 , 231 Xfer case, 545-RFE , 3:55 gears, as well as those in my latest project, a '02 WJ Limited 247 Xfer case, 545-RFE and 3:73's..which may end up with a 242 HD Xfer case..

[@martinbuilt]

I would go with the Bosch 280156161, they will work with both stock and modified engines.

[@pesnet7]

Hello! Can anyone on this Mr Martinbuilt channel help me on how to recondition the injection nozzle flute. It has a leak in the connection with the communication tube that is between the flutes.

[@terrysmith8133]

would you happen to have a good set of 2000 grand cherokee 4.7 heads?

[@jeffrichardson256]

I just did this to my 02 Dakota. Worked very well. Importantly I did not come across any issues that you had not already addressed and am grateful to you for such a well explained process.

[@martinbuilt]

Thank you Jeff, I'm glad hear it worked out for you.

[@courtneymapel]

Your videos are always super helpful. I watched your timing chain video too and without that video I probably wouldn’t have been able to do it. Now my Dakota is missing on 2&4. I was told it’s lifters (without proper diagnosis) I’m just goin to do lifters and injectors to be safe. Thanks man

[@BigWood3131]

Thanks for the video and where is the cheapest place to buy injectors for my 2002 jeep Grand Cherokee 4.7. Thanks

[@beefboyhead]

Andy Elwood ebay

[@danieljackson5658]

This video was really helpful in getting my 2006 dodge Dakota back running the way it suppose to run Thanks for a well put together video

[@thomaslokers3497]

how can i order a set of injectors for my 2000 jeep grand cherokee limited 4.7 from you

[@johnbranch882]

why didn't u grind clips first apparently u knew this before u installed them just asking lol

[@betterthanyou2894]

How much does these injectors Improve mpg cause I have a 2002 dodhe ram 1500 4.7

[@martinbuilt]

You should see at least .5 to .75 MPG minimum. I've had a lot of people tell me they got more than that.

[@wernerswanepoel5898]

Just want to chear some info.. I am battling with my wj with some rought idle problems.. starting to change some sensors .. by switching the ignition 3 times on and of my jeep keep on showing “ done” which means nothing wrong ... today I have received my diagnostic tester or code reader ... the moment when I have plug the OBD reader into the car ... my wj start showing fault codes.. that means that although your jeep show done that doesnt mean there are no faults

[@VentShop]

Get a can or carb and choke cleaner and spray the intake butterfly as well as the intake idle air passage down and the idle will straighten out. Dirt and carbon will build up in those area's and it will choke the idle down till it starts to sputter and die but will run fine off idle. My 03 dakota seems to have the issue creep up about once a year and hosing things down and cleaning the butterfly off really helps. The last time I did it I used Seafoam and it seems to have lasted a little longer than just carb/intake cleaner did but the cost is a bit higher. I think it stays in there and cleans a little longer rather than just evaporating off and leaving crud behind.

[@tylerbanning7776]

Do you think i can put this on my 05 dodge ram 1500 its a 4.7 v8, thanks

[@martinbuilt]

Yes they will fit. Thank you for watching

[@chrissnyder2726]

@martinbuilt I have looked through the comments before asking but I have a 2005 Dakota 4.7 magnum and was wondering if the Denso injectors would work on my truck? It runs good but has 130,000 mile on it now. Just wanting a little more power!! Thank you for your help!!

[@martinbuilt]

I would stick with the injectors you have I have heard some comments of people with the newer ECM like yourself where it will run rich I believe the newer ECM doesn't have enough tolerance built into it to compensate for the extra fuel that these injectors could deliver. If you had a modified engine with bolt ons like the 08 cams, intake manifold, larger throttle body, free flow exhaust then the denso injectors would probably work well.

[@KP_4130]

Just wondering how many folks have done the denso swap and and experienced crazy rich conditions with -35% long term fuel trims?... I was so pumped to do this mod but unfortunately my 06 WK pcm wasnt having them. The only mods I have are a custom CIA and 3 inch exhaust with hi-flow cats and straight through muffler.

[@martinbuilt]

I have noticed anyone that has complained about a rich condition using these injectors has the NGC ECM apparently the four plug ECM does not have the tolerance to adjust for these injectors like the early 3 plug ECM.

[@Mabooze]

Hello Martin.... Question..... Are those DENSOS are BRAND new or REBUILD ???

[@martinbuilt]

They are ones that I rebuilt. original Denso injectors. Thank you for watching.

[@alexandercardenas5742]

Hello, I just watched your video, can I use those injectors on my 2004 Dodge Durango 4.7 4x4?? Or which ones do you recommend?

[@martinbuilt]

Yes, you could use them. They work better with a 4.7 that has some mods. I would recommend the Bosch 280156161 found in the Ford eco boost engines.

[@richwilson7017]

Hello Martin thanks again for these helpful videos I put in the 12 hole injectors in my Dodge Dakota. My fuel trims at idle are around -20 or so give or take. I don’t know if these injectors have something to do with it it’s on both banks. When I put the vehicle under load the trims even out. I was curious if you might’ve had this happen when you installed them I did do a quick learn. Thanks!

[@mlubnani]

Same problem. Not response. My friend had same problem too. -30 long trim .

[@grlnboots]

I installed the new Bosch injectors, vehicle is not idling and smoke pouring out of pipe. Any idea?

[@martinbuilt]

If it didn't do that before you installed the new injectors I would think that one or more of those injectors are no good.

[@steelbak-customs]

I'm really enjoying your channel. My son and I are doing the top end of a 2004 4.7 Jeep Grand Cherokee. This is incredibly helpful and allow us to get it done.

[@martinbuilt]

Thank you Scott, I really appreciate that. I'm glad you liked it and found it helpful 👍

[@benwood1777]

Great video. Actually shows all complete steps. Probably best one showing how to swap the injectors on 4.7 Magnum.

[@michaelsutherland3981]

Great video. Explains it very well. I have a question. will the Denzo fuel injectors work on my 2009 Dodge ram 3.7 l

[@AndreasEUR]

Wooh! Haha! Text message!

[@gregcorley4809]

Awesome information, I have a 4.7l 2006 Jeep Commander and looking for better HP & MPG. Can you tell a big difference after installing the Denso injectors? If so, would be interested in knowing the results.

[@martinbuilt]

I'm very happy with them. They are better then the Bosch 280155894 by .3 to .7 MPG and alot better then the stock ones.

[@justindaniels17]

Is there any alternatives because in South Africa there is no 2.2 or 2.4 ecotec engines and there is no 2.3 duratec engines either is there any other alternatives? I've got a 4.7 HO engine trying to improve fuel economy and increase power

[@martinbuilt]

Try the Bosch 280156161 injector. Found in many ford compact cars with the eco boost engine

[@williamchadwick9949]

Thank you sooo much for the most descriptive videos I've seen! I plan on doing many of these mods to our WJ soon but I was wondering if you of a similar injector swap for a 99 ram 1500 5.9L? Soon as I saw the list of completely different makes not to mention 4bangers injectors you matched I thought "Wow! That's some crazy crap I'd do". FYI 70' C10 tailgate fits my 77'f150 quite nicely. Just move the brackets over too. Sorry I don't have questions on the jeep yet. Ya kinda answere them before I think to ask. Wife's gonna love her jeep so much more when I get these done!

[@ctdope]

Did you say that the new injectors made computer act funny? Did it make the check engine light up, or something else? I want to do this mod, but getting tired of all the little headaches. Trying to bring my WJ up to 100% working right. Lots to do.

[@ar1913]

I was wondering if the fuel injector clips necessary for this upgrade?

[@martinbuilt]

technically no but, if you pull the fuel rail later the injectors may stay in the cylinder head and dump gasoline all over the engine.

[@terrysmith8133]

you reply with a combination of things, but did injectors make the biggest difference in mileage? if so about how much?

[@martinbuilt]

If I remember right I believe it was 3/4 of a mile per gallon better with the new injectors. And have heard of other people gaining as much as 2 miles per gallon better.

[@hunterchesser9704]

Dont fix it of it isnt broken!!! I did this cleaned them on a injector machine and all put them in ran good for a second thurm it off went to start it back up and bent and broke my rod and then rod slapped bottom of cylinder wall amd took a chunk out so not i’m debating on rebuilding it…

[@martinbuilt]

You had a leaky fuel injector then

[@fordman77881]

How did the denso ones work out I have a jeep liberty with 3.7 I wouldn't mind trying them in

[@martinbuilt]

The Denso injectors are gonna be too much for your 3.7. I would recommend the Bosch 280156161

[@tristenbrower2347]

Best how to do video, great everything , he gets down to every detail. Made it very simple hope this works for my wj thanks!

[@michaellanci1158]

Where did you find the Denso’s? I can’t find a place to buy them for my 04 Jeep.

[@martinbuilt]

Here is a link to those injectors. amzn.to/3iwFPbB

[@garychandler4296]

My 04' 4x4 Dakota has the 3.7 dog in it, 15mpg, no power. I have swapped the 3:55 for the 3:9's but nothing else yet as I'm an old Chevy guy. Not sure what would happen if I put the Densos in.

[@martinbuilt]

The denso injectors that I show in the video would be too much for the 3.7

[@ASwordOfTheLord]

​@@martinbuiltwell you answer people on here that rocks good for you brother

[@GoCubsSoxSuck123]

Loved the video. Makes me more comfortable to swap my injectors by myself. Earned a subscriber. Thank you

[@Cdaniel121]

Same here.... I'm throwing 3 codes in my 00 4.7L Dodge Dakota, all of which are injectors and misfire... Have to do this in the coming days... Paranoid, but more comfortable than before watching...

[@mikecastleberry9671]

Db

[@grlnboots]

Martin, what were the issues you had with the Bosch injectors? I'm about to put them in my Dodge 4.7L 2005 Ram 1500.

[@martinbuilt]

grlnboots Even though the gas mileage seem better I was definitely getting a lot of black soot at the end of the tailpipe. I believe this was happening only at 3/4 to Full Throttle they would run rich. At cruising speed I was getting good gas mileage according to my wideband air fuel ratio gauge

[@grlnboots]

I installed the new injectors, vehicle is not idling and smoke pouring out of pipe. Any idea?

[@reptilian6413]

Now that you have been driving this with the new injectors did it change anything? Did you also notice any difference just swapping your old injectors to new ones?

[@martinbuilt]

Chris Verkaik Well I did notice a gain in miles per gallon. They do run a little bit leaner at Full Throttle then the set I had in there. The previous set we're the ones out of a Taurus SHO. They have great throttle response and good idle. I'm very pleased with them

[@olivert1289]

Thanks for the video! Helps us keep our 4.7s alive. Mine just rolled over 401k miles without a rebuild. I couldn't find the Denso units you used, so I used AC Delco 217-2907 for a 2007 2.4L HHR. The resistance is about +1ohm (13.2 or so ohms vs 12.3 or so) vs my 2003 stock non-HO units. They're 12 holes just like your Densos, but I didn't have to mod the fuel rail because they didn't touch the valve covers. For anyone reading this, in my experience the mpg display is super optimistic now (600 miles of mixed driving) and shows 19-22 average. Realistic fuel economy is unchanged at about 17.8 combined. There is a cold idle + AC on idle issue where it gets confused and pulses the IAC erratically, then clears up. Happened after PCM reset mainly and now clearing up. There's definitely a low rpm torque bump, and a much smoother power delivery throughout the range. Full throttle I dont notice any bonus, but part throttle and especially super light throttle, totally worth the benefit. On my Dakota the replacement was more involved because had to remove alternator and move AC compressor, and bungee wires and heater hoses out of the way. Took about 3 hours going easy and cleaning up and painting the fuel rail.

[@qlab5715]

Would these work in a 2002 chrysler van with 3.8l?

[@martinbuilt]

They would probably be a little too much for that engine. Don't know if the ECM could compensate for the extra fuel.

[@tylerbanning7776]

Just wondering how they are treating your 4.7 what did you notice after instaling them?

[@martinbuilt]

MPG has improved. Excellent throttle response. Great for a modified engine.

[@cuzrocks5002]

Hey I had 440cc removed and I put 750cc fuel injectors car starts up put when I hit the gas dies anyone could help me what's the problem thanks

[@martinbuilt]

that a big jump in cc. what is this on? Is it possibly to much fuel and flooding the engine.

[@cuzrocks5002]

@@martinbuilt it's on 99 Mitsubishi eclipse gs turbo, I think that's the problem too much fuel flooding

[@martinbuilt]

@@cuzrocks5002 yes I agree that was a huge jump in cc's and I'm sure the ECM cannot compensate for that much fuel. Thanks for watching.

[@garyaj1010]

I just replaced with these injectors on my 99 WJ 4.7L along with manifold o2 and cats. Running like a champ now ! Love your videos !

[@martinbuilt]

That's awesome, glad to hear that it worked out for you.

[@vtmz9589]

Great video.. by the way did you get the instructions on resetting your ecm with the injectors or you search it up

[@martinbuilt]

Thank you, I looked it up.

[@Artecd]

I installed fuel injector 12582704 on Durango 2 4.7l LTFT bank 1 and 2 became -17 - 25. But everything is fine, the city is 16.5 liters and the highway is 13.5 per 100km driving has become smooth. But the fuel correction of -17-25 is confusing, once there was an error P0172 and P0175 (one time after three months)

[@mlubnani]

Same problem. A Lot of martin's fans have -25% fuel trim and not have idea

[@Artecd]

I removed this injectors and install another 12 holes 0280156161 Good. Try it.

[@bugrakkabakci]

@@Artecd no more engine lights after 6161?

[@Artecd]

All good

[@Qwerty8790]

Do you have factory coils? Or aftermarket replacements?

[@martinbuilt]

I am running the weapon X coils, now don't run out and buy them because I can't say that they're worth it. I wish msd would make coils for this engine

[@pesnet7]

Hello! Mr Martin! About Jeep Grand Cherokee WJ year 2000. Would you know how to recover/open/replace the repair of the flute that houses the injection nozzles and which has a fuel leak at the junction of the communication tube with the rail tube of the 4+4 injection nozzles? In order to recover. It is not new on the distributor market, only used. In summary, how to open the junction of the communication tube between the pipe injector tube line? Kindly, can you help me, guide me? I am from Brazil. Thank you.

[@robertemmons2260]

Great video! I've already replaced the injectors on my old '02 Liberty Sport five or so years ago, so I've already got the process down. Back then I had used the Neon injectors for the upgrade, and I did notice an increase in power, but still rather poor fuel mileage of @15-16 in town and up to 23 on the highway. Just last month I had picked up an '02 Liberty Renegade for only $1000.00 with a blown transmission. What I had watched the video for was to find out what injectors that you had used to achieve those MPG and performance gains.

[@Peterthebartender]

He Martin. First of all I love all your content. I just replaced my 2005 dodge durango 4.7l fuel injectors with denso as you suggested and now my truck is running very rich long trim fuel from bank 1 and to are -24%. Any suggestions on how to address this issue ? Thank you sir

[@martinbuilt]

Thank you, I'm glad you liked the content. On the fuel injectors, I've heard the same thing from a few people. And then I get the opposite response were how much it has helped their engine in better fuel economy. And maybe it worked real well for me. Because I have several modifications done to the engine. Like exhaust and air intake that can handle the extra fuel. I wonder because the year of your truck has the newer e c m and does not have enough threshold to make the adjustment for the extra fuel.

[@jefflupp2587]

@@martinbuilt Hey guys... thought i would chime in on this one as well! I have been able to do all the mods with the help of your videos so thanks! I have done the cam & intake H.O. upgrade, and as well had the heads done at my machine shop. I also did the timing chain, and gears, and have upgraded the coil packs. this along with a general overall re freshening of things including all new sensors has produced a very strong running 4.7 in my 2002 Dodge Dakota.! However with the upgrade to the Denzo injector i to am experiencing fuel trims up to -28%, and i can see in my torque pro app data that the 02 sensors are responding accordingly, and you can see things trying to correct, and i have had a P0172 rich bank 1 code. I have done the I have the 3 plug ECM, and have done the resets etc. I have bench tested the relevant sensors including the MAP and they are functioning correctly. When i fired it up originally i was experiencing a long crank to start condition, and a fuel pressure test confirmed the regulator in the pump was bad. Replacing the pump resolved the fuel pressure issue, but i am still left with a long crank to start condition, just a much much shorter cranking time that when the regulator was bad. I have done a pressure leak-down test at the fuel rail with no drop indication that i do not have a leaky injector. When i pulled the plugs they look rich on all 8 cylinders, and it smells like it is running rich. With all that said i am servicing the factory Siemens injects, and am in the process of re installing them with the hope that it resolves the need to crank and gas to start. Just thought i would share this experience with the group, and again a sincere thanks for all of the great info, as it has been my main go to during the Dakota build...I will follow up the the results after re installing the factory injectors

[@curtisbrown9242]

Nice videos really like the detail you put into them. Please let us know how you like these injectors after you get to run them for awhile.

[@martinbuilt]

Thank you...I let you know.

[@martinbuilt]

Curtis Brown hi Curtis I took the Jeep out to LA and San Diego this past weekend for spring break with my daughter. We were able to get right at 25 miles a gallon round trip that is interstate and City Driving in LA area. Way better than the 894 Bosch injectors I had in there. A matter of fact I had to put O2 extensions on the rear to O2 sensors when I had the 894 s.. this time it through a code for the rear O2 sensors saying that they were reading too much oxygen so in other words I have to remove the extensions which is a good thing. very happy with them

[@Peterthebartender]

would this injector work for my 2004 durango wirh a 4.7 ? thank you I love your video

[@martinbuilt]

Thank you, Yes they will work.

[@Peterthebartender]

@@martinbuilt thanks i am going to try it out

[@michaelring2028]

Thanks for the detailed video. I have a question for you. I need to replace a valve lifter on a 3.7 Jeep. Since I'm going that deep I thought I'd do plugs and hoses too. It looks like getting the injectors off the intake is straight forward. My question is, is the FI openings big enough for a endoscope camera to fit so I can check build up on the intake valves? Mike

[@jdsrcs8061]

Great vid Martin. I have watched it a few times and I think I'm going to try it. My 04 overland has been great about 3 weeks ago I got a P0307 misfire. So I started the diagnosis process. The vacuum line that goes to the valve right next to the #7 cylinder was cracked so I replaced it. Idle improved and I cleared the code. It came back about 3 days later. I replaced all the spark plugs since I had a full ser on hand. Code came back 2 days later. I then replaced the coils on all 8 cylinders. Again code came back in 3 days and has been on. So I am figuring that it must be the injector. I am looking at replacing all of them since I will be in there. Have the denzo's giving you any codes over the time you have had them? Any other things I should look at?

[@martinbuilt]

The Denso injectors have been good for me. I have never gotten any codes from them. I noticed you said you had a P307 that should be cylinder 7, and you mentioned you changed the cylinder number 8 coil. You could also try changing the coils from another cylinder and see if the code jumps to a different cylinder. 😉 Thank you for watching. 🙂

[@jdsrcs8061]

@@martinbuilt I went ahead an got a full set of coils and swapped all of them. The motor runs great, but that code came back. Now I'm looking at what to look into next.

[@jdsrcs8061]

Well Martin!!!! What a pain in the ass!!! It took me a little over 6 hours to do this job. All the injector plugs we a bear to get off. Then when I was removing the rail, the #7 cylinder injection clip popped off. It took me forever to find it. I just finished. And it started up great so we will see if it takes care of my issue!!!👍👍👍

[@irish6976]

Martin! i noticed in your "new" shop that you have a fuel injector test machine! I'd like to see if I could buy a tested set of matched injectors from you? Or acquire a set of injectors and send to you for rebuild and testing? I'd like to do this mod, but need a trusted set of injectors. I have a 2004 JGC Limited, with 4.7L HO engine.

[@doubledown9970]

You always do a good job on you're jeeps!

[@martinbuilt]

Double Down Thank you!

[@iowafarmboy]

I'm glad I watched this first before just "digging in" on my 08 Grand Cherokee (220K miles). Only got 1 injector, but might as well do them all seeing what it takes. But these directions are absolutely very clear. Thank you!

[@martinbuilt]

Thank you for watching, if you have the dual spark plugs per cylinder you will need to use the OEM injectors as they are shorter than the earlier models. I am originally from Iowa

[@iowafarmboy]

@@martinbuilt well, hello fellow native Iowan 😊 It's a 3.7, so just a single spark plug. I've replaced the injector coils more than once (got a bad batch when initially replaced them), so I certainly know my way getting down that far.

[@martinbuilt]

@@iowafarmboy Good luck with that and have a great New Year.

[@gregcorley4809]

I finally completed this modification in my 2006 Jeep Commander (4.7) and it's night and day difference. Have a question, it takes a little longer for engine to start on start up and at idle the engine runs a little rough, but on the open road it just screams! It threw a code that the engine is running rich, I'm assuming all of this is due to the ECM still learning and like you mentioned in your video will take about 50 cold cranks for the engine to relearn? Thanks Martin, I don't believe I could have done with this without the help of your videos.

[@natewatson8408]

How much of an increase in milage have you seen? I’ve considered the same on my 3.7 Commander. Did the rough idle ever work itself out?

[@timothygarza3699]

Yes, has it gotten better??

[@gregcorley4809]

Yes, most definitely. @@timothygarza3699

[@itsme2369]

Hey Martin I have a 09 3.7L Jeep Grand Cherokee Laredo i just did this job to mines i changed injectors park plugs coils spark plug wires but i don't remember which wire goes to what coil. My engine only has 3 coils on the driver side and the passenger side it has wires that connect to the coils and silly me I didn't take a picture which I've should've done so. Now when I turn the jeep on it sounds like gun shots lol and I have code P0300. I'm so confused here just trying to save money before I drop it off to a mechanic. Maybe its something I can fix before that. I would appreciate your feed back on this matter i really need my Jeep no work no money

[@martinbuilt]

The P0300 code that is a random misfire which is understandable.. I would think that the harness the way it's manufactured would kind of give you an idea which connector goes to which coil. I know my 01 Dakota actually has cylinder numbers labeled for every coil, which is very convenient where my 04 grand Cherokee did not.

[@itsme2369]

@@martinbuilt thank you for replying, I found out that my 09 Jeep has a 2010 motor and the firing order is 6-3, 4-1, 2-5. Once I did that she turned on and she was puring.

[@ctdope]

Hi Martin, question: after new injectors, does the engine just run better, or do you have to have the computer tuned or reset ? I'm almost ready to do the work, but Idk any performance shops around where I live, and the dealerships now, dont want to work on my WJ because it's too old and they don't support them with electronics. They don't want to mess with anything older than 2007.

[@mikajones3018]

do this engine fire all injectors at the same time >>??? mines does this

[@martinbuilt]

No one at a time at the appropriate time. I've never heard of an engine that fires all injectors at the same time. That would be a huge waste of fuel and could cause backfiring and all kinds of other problems. Thank you for watching.

[@ASwordOfTheLord]

HOW ABOUT ON A 2000 JEEP CHEROKEE LOREDO. "STRAIT 6 ". 149,000 MILES 4.0L ..........,❓❓❓❓❓❓❓❓❓

[@martinbuilt]

I like the Bosch 784s that are found in the 2.2 and 2.4 Dodge neons. and the Bosch 161's that are found in your Ford focus EcoBoost engines.

[@LuisManuelHdez]

My 05 GC limited 4.7 has really gotten bad on gas. I get about 11 mpg on the street. Wondering if this would help.

[@JameyCampbell_54]

LuisManuelHdez I get 11mpg in my 2005 also. I used to get 15-16mpg. I'm Going to change the injectors and hope that's the issue. Good luck lol

[@LuisManuelHdez]

I'm looking to do the same soon. Just bought a new mopar fuel filter online really cheap too. Hoping like yourself to improve gas mileage. Unfortunately these cars are gas guzzlers and only get worse as they age.

[@JameyCampbell_54]

LuisManuelHdez I also have a 2006 that I lowered on H&R lowering springs and built 6.1L out of a wrecked 2007 srt8 wk1 , also removed the roof rack and that 4.7L wk1 got 16.5 mpg Roof rack probably didn't make any difference in mileage but it looks cleaner without it

[@LuisManuelHdez]

Jamey Campbell.. it would be great to get 16 mpg on the st again. Working on it. Those are nice upgrades.

[@solluna2155]

Thanks for the teaching , question the you have any videos of how to replace the valve cover gasket on a V6 3.7l ?? I am going to replace my next week a instructional video like yours . .. 🙂

[@martinbuilt]

This video will help kzbin.info/www/bejne/i4PVgmypgsx_gNU

[@solluna2155]

@@martinbuilt thanks , very detailing !! Keep the good work . ..

[@albertogonzalez5564]

Did you ever have any issues with removing the connectors from the injectors? I keep pushing the clip but they wont come out

[@martinbuilt]

Alberto Gonzalez unfortunately yes what happens is they get brittle and they break. You can still get it off but what you'll need to do is get it pic and come from the back side of the connector and lift the Locking tab. You'll need to replace the connector. Her is a link kzbin.info/www/bejne/p3_Je6qNgbt2l9U

[@albertogonzalez5564]

Thank you sir!

[@smithFam1205]

Great video Martin! Your videos have been very helpful to me while rebuilding my 4.7 - How well did these workout for you now that they've been in for a while?

[@martinbuilt]

Thank you, yeah they've been working out great for me. And are a great choice for a modified 4.7

[@richwilson7017]

If anyone else could shed some light on this I would appreciate it at idle I am at -17 short term fuel trim both banks and when I let off the gas after cruising it shoots up to like -34 I do know on the 2004 and up models the fuel pressure is 58 psi if you have the 4 connector ECM if you have the three connector ECM it’s like 40 something psi on fuel pressure. This might be the difference my truck runs great with these injectors though if I could just keep my eyes from looking at the long-term fuel trims I’d probably be just fine. Lol.

[@Trailer4904]

I just did this upgrade. I haven't driven it enough yet to get a good average mpg, but my instant mpg went from 21-22 @ 50 mph to 32-36 @ 50 mph. Thank you Martin, you videos are in formative and knowledgeable. I've learned so much from your videos and I plan on doing quite a few more of you mods.

[@martinbuilt]

That is awesome, great results, thanks for sharing 👍

[@phillipmcmullen7163]

Lol false

[@PNW_Hillbillys]

Where did u get the denso injectors cant seem to find them online

[@martinbuilt]

I got them from my local salvage yard from a Saturn with a 2.4L. I prefer those from brand new so-called Denso injectors many of them are counterfeit and do not perform anywhere near like the originals. Thank you for watching.

[@kraken8159]

👍👍👍👍👍love you videos. Question??? I have a 08 Durango 4.7. I’m gonna replace my lifters on the passenger side. Getting a tick now and then. But I see that my fuel rail is right above the valve cover. Will I have to disconnect it to service the lifters? Or can I get to them with out it?

[@TYVIDIPS]

Hey Martin! Is that breather holes just a vacuum holes? I broke mines and I’m looking for a replacement just wondering if it’s actually a holes for the oil or I can just use the vacuum one. Thank you in advance!