TBI Rebuild - GM 5.7 liter

[@jrtan8613]

The two long silver colored screws are to hold the fuel pressure regulator cover in place while installing the spring. Place the red diaphragm in place and put the long screws through the regulator cover (without the spring) and start the screws into the housing. Compress the spring and slip it under the cover and the long screws will keep it in place while you start two original screws. Remove the long screws and install the other two hold-down screws and that’ it. Keep the long screws for the next TBI rebuild, because some repair kits don’t include the long screws.

[@dougolson1753]

U were wondering what that little blk plug was there is actually 2 of them in the kit and they r small screens that go in the sides of ur injectors ..they look like tiny plugs but there screen...

[@jeffpatterson3676]

And only go in, in one direction.

[@charlesparr1611]

By far the most useful video on youtube for this particular subject. I dont know what the tiny tiny screens are for either, but they must put them in there for some reason as theyve been in qll the kits i have seen and everyone else wonders what they are for. I rebuilt mine as part of installing an upgrade called ‘TBI power up kit’ qit includes a 14lb regulator spring and a larger spacer between the injector and reg chassis and the main body with the throats. Took me 40 minutes to install as its just replacing parts already in the rebuild, and the results were dramatic. Stock engine was smoother, more torque low, fatter horsepower curve and noticeably easier running at 150kph. I have my engine in a shag wagon that weighs almost *4.5 tons, and it improved mixture delivery enough to make that mass jump. I also tried an 18lb spring, but my fuel pump ran iut of gas (heh) and not much improvement. The little kit was about 40$ and it is hands down the most hp per dollar ive seen. They claim it puts 14hp into a stock engine and i think its more. Anybody doing this rebuild, you would be insane not to add this kit when you do. *7000lbs machine, 1600lbs of glitter, shag and wood grain.

[@johnhare513]

Stuff like this I take a pic and print it out actual size or bigger and poke the screws in the same place on the pic.

[@logan9305]

John Hare that's a really good idea. Really ingenious too

[@tonyc9505]

John Hare Wow great idea. Thanks.

[@MrLiquidscar]

Most excellent my friend, with your video as a guide, I rebuilt my TBI on my 95 suburban k1500, solved all my issues, no more backfiring, no more bogging down under load, AND a little extra pep. Not a lot... but like driving grandma's car, just a touch more responsive from not being beat on. lol Thanks again!!

[@juanmarshall4083]

Outstanding video, you were there with me the whole time. The only problem, i don't think you mentioned the orientation of the fuel injectors the fact that the lil piece at the bottom has to line up with the notch inside the bowl. Had to pull top back off after fuel was squirting everywhere. 3rd gen had an injector video where he explained how they're oriented.

[@ulis_garage]

Thanks! I just finished rebuilding mine and I referred to your video several times. Great video!

[@chadwade1703]

Attempting my first full rebuild on my 89 Chevy Stepside. Thanks this helped.

[@jf4872]

The (2) very small ones are screens. They're in the side of each injector. Most do not replace them unless the ones are missing or damaged. Always a good idea to coat all paper gaskets with Chapstick. This will prevent them from sticking.

[@Kyckrockz-m9c]

The tiny piece (that you couldn't figure out where it went) goes on the side of the injector. you have to take the other one out, i used a took pick to get it out

[@davidwostrel]

hopefully it will keep working without it :)

[@Kyckrockz-m9c]

Lol

[@Gabriel.4190]

@@davidwostrel you happen to remember what size stars/torx you used to disassemble.

[@Codycommanderr]

Just watched this video to help make sure I got mine back together right as I was lubing injectors up noticed the little screens in the side and changed them should have look in comments I would have know

[@bobbygomez2365]

Sendpicture where it goes

[@gregorysmith9039]

This helped me a ton! Thank you! I made my own video to help others I hope. I made a few mistakes along the way but perseverance paid off. I love working on my k1500!

[@lousmith5264]

Excellent video. Love the double speed. Those two long screws in the kit are to align the pressure regulator cover while you push down the spring. Helps keep the diaphragm from moving.

[@davidwostrel]

That is super useful to know! someone else in the comments was saying that they struggled with the diaphragm. I feel like i got lucky with it, but the clamp was a super handy way of doing it. Thanks for watching!

[@yashuwasaves4851]

Pops u up on my feed I was thinking about theses and didn't even look for it at all

[@linesatmc]

Great Video, thanks so much. Been putting this off for a min because I haven't been able to find a decent tutorial until now. Love the uncut errors as well, nice to see what can go wrong.

[@davidwostrel]

I am glad that it helped get you motivated, the tbi was much simpler than a mech carb. good luck on your project!

[@CB71SS]

Have a 90 GMC 5.7 fixing to give this a try and it along with most of the comments are really going to help. thanks

[@baltod4978]

Thanks David. Doing mine RIGHT NOW as I type. lol. My kit (which is the same as yours) is missing the transparent plastic washers that go on the fuel fittings. They only gave me one. Go figure. Probably end up using the old one. I've got a 92 Olds Custom Cruiser and I was getting a real high idle in park and neutral, drove perfectly fine. Maybe a little higher RPMs than usual. Replaced the ICV and that did not solve the issue. (It was under warranty anyway). Checked for vacuum leaks and didn't find any breaks in the line, however I did see a large chunk of the gasket that seals the TBI onto the intake mani blown out of the side. So I figured I'd just do it all in one swoop. Thanks for the video friend.

[@javierrodriguez2919]

Does anyone know if the 4.3 tbi is the Dame as the 5.7?

[@davidmummert5066]

Intake Manifold Gasket had small chunk missing also on my 87 Silverado 5.7.had same idle issues

[@jamest4363]

The tiny screens go in the side of the injector itself ..close to the mounting surface of the top oring seat.

[@allenmckinney9533]

The box idea is a good idea. When i replaced the heater core on my s10 i used a cardboard sheet and labeled rows of bolts from what area they came from.

[@ashleyevans6501]

cars 3 pod

[@Swoledier90]

The tiny little piece at the end looked like the fuel injector filter that's located on the side of it

[@linesatmc]

Great Vid! Really gave me the confidence to tackle this myself. Thank you very much. That little black washer was for my smaller fuel line.

[@doncox2146]

The seal/gasket that you said was doubled and in fact there was two. It's not a gasket or seal it is a thermal barrier between the fuel passages and the actual throttle body. So two actually can't hurt but can also act as a better thermal barrier. Good job nice video

[@StephenEllis-gy8be]

Those little round screens go on the big side of the injectors 3/4 up from the bottom. Look at your recording from 18:58 - 19:04, the injector that you put down with the metal and rubber O-Ring, hos the small round screen upward facing you.

[@etmesi]

The injectors have to seat and the rubber O'rings got to stay seated and you press the injectors in 24:13. I did one just like this with two torn retinas and macular eye pucker, it looked like the injectors were down but I guess not quite. I tittened all screws then another guy put it back in the truck. The stress on the metal that surrounds the injectors busted looked like a dog took a bight out of it. Lucky I had a whole another Throttle Body to put in. Thought I would say this to watch for that O'Ring needs to stay in and the injectors make sure need to be all the way down.

[@gaminredneck5216]

Great video man! To help you out next time, use a little motor oil on the screens and O rings for the injectors, it will make your life a lot easier with sliding everything back together, fortunatley I got new injectors which had the screens already on

[@bhabigbig2391]

I always use a socket and never had any problems .

[@lousmith5264]

TIP: before bolting TBI to manifold, finger start the fuel lines while you can still wiggle the TBI.

[@ronaldhudson3]

Lou Smith t

[@Codycommanderr]

Listen to this man makes it a little easier

[@williamgoring7605]

You've got a very good rebuilt it's the best rebuilt I've seen yet on a throttle body at home good job

[@williamgoring7605]

Instead of a screwdriver on that screen that slips over the injector I use a socket a deep well socket this way to the edge of the screwdriver you did a good job you didn't mess it up but some guys are split the break it with the edge of the screwdriver so a deep well socket Works a little better anyway good job

[@williamgoring7605]

Again I used a big socket and put it down over my injector and pressed it with a C-clamp to press the injector into the housing which gave it a nice even press all the way around the edges

[@alainapullock81]

thanks this video is awesome. ive been having a hard time with my rebuild. great vid

[@bowtie-man]

Hey David, thanks for posting your video. I watched it a couple of times and did mine this weekend. Thanks for the heads up of what to expect. ✌✌

[@kiakamgar]

I'm late to the party, but this has helped me no end! Thanks for the upload David 🤓👍

[@bhabigbig2391]

If you look on the side of the injectors you see the small screen there should have been 2. 1 for each injector .

[@calebremsberg1718]

Also injectors have a notch on each one that lines up in the injector pod.

[@jamesdeeton4299]

Throttle position sensor gasket was in the box left over. 2 tiny screens look like they go on nipple at bottom of Injector.

[@juanmarshall4083]

outstanding motivational video we still want to know what your problem ended up being a lot of us are at sea.

[@LOWEFERRARI]

David...I guess that little screen goes in the little hole at side the injector. In my case the injector has. It is a 4,3L, I don't know if the 5,7L, Your case, has it too.

[@davidwostrel]

LOWEFERRARI very cool! thanks I will see if it fits there the next time I need to rebuild :) good luck with your projects!

[@waylonj4078]

I believe the tiny little screens go in the Side of the Injectors.

[@williamgoring7605]

Really good video you did a really good job with that camera wasn't too close you could really see what you're doing I also have a suggestion if you're into this type of video check out motor man how he puts the injectors through spray test it's really cool anyway great job

[@gregrobinson9827]

the little tiny screen you were talking about goes in the side of the fuel injectors there should be 2 of them they are kinda of a pain to get in straight and flat!

[@steveandamandacarter2683]

The little peace is for the injectors should have came with two one for each . There will be a little hole on side of injectors it has to be popped into place but take out old one first

[@e.j.thompson2633]

Nice video, thanks for sharing. Big help.

[@92silverado32]

this video helped me out a lot thank you

[@matthewdingus1953]

Dude good video for sure better than the bullshit most people post

[@watershedwonders1744]

Thanks

[@MrLiquidscar]

as for removing the fuel injectors, I plucked the O-Rings out with a razor blade and could then pull them out with my fingers.

[@premixpeter1972]

Same here! razor blade did the trick. Mine didn't have washers coming out, why does the kit have them going back in?

[@MrLiquidscar]

@@premixpeter1972 Mine had no washers coming out either, from what i understand they are "retaining rings", I suppose to keep the washers in place should they expand? Not quite sure on that, but it all went back together with the metal rings on it so.... ::shrug:: * I should have taken note of the positioning of the fuel injectors before I put them in with the washers, went to plug them in, had to loosen everything back up and rotate the injectors 180.

[@premixpeter1972]

@@MrLiquidscar You had to rotate them 90 or 180?

[@MrLiquidscar]

@@premixpeter1972 apologies, had to rotate 90 or so, they were in tandem when I bolted it back on, should have been side by side. Rookie mistake. Lol

[@ultraaa3k902]

Ahh man I’m in the process of rebuilding right now, and let me tell you, trying to get that spring on the diaphragm is really pissing me off

[@timmymonte9813]

I'm doing that right now and had a whole bunch of fuel rush out of the regulator area after my first attempt. I'm giving it another shot in the morning.

[@mickgrammifications9293]

That's what the two screws that come in the rebuild kit are for...to make that alot easier

[@NathanWostrel]

Screwdriver hammer!!! Nice.... BTW, glad to see a new video! :)

[@russchamberlain8755]

Poor quality vs poor experience? Well Thanks for your time here. The long rods are a alignment tools for the pressure regulation body. And the tps would help with to much fule or wide open injectors. And the little black extra parts are filter screens they go in the little holes on the side of the injectors ; the little black spots there is one per, use a o- pick or small needle nose pliers.

[@alainapullock81]

If we wanted poor expeience and quality, we'd watch one of your videos. ;)

[@RyanRaybon]

I just did mine and now when I start my truck it shoots gas out of the tbi gasket I went back and checked all my screws there tight and it sounds like I got a cam

[@TheDudeDevil]

Just a heads up when you put the screen on injector make sure you position it so it doesn't cover the holes for fuel inlet. Otherwise great video.Good job.

[@davidwostrel]

Gordon Simmons might have to look into that :) thanks!!

[@TheDudeDevil]

You're welcome.I've done that and had fuel restriction is how i know.

[@thegreener196]

mine has a big type of Oring that does not come in the kit and mine as bad any idea's what i can do about it?

[@gera2396]

Is there a gasket on those fuel line nuts? Nevermind, I see that it does.

[@juanmarshall4083]

my 92 Z71 runs like a champ but when I rev the gas up sometimes and come off the throttle it goes all the way down to a choke and then evens out. I bought it like that for years ago and I have worked it every day since it just does it

[@michaelferrier8521]

I bought a 94 that had the same issue. I drove it like that for almost 2 years until I finally replaced the egr module and egr valve. It runs great now.

[@000piper000]

the little tiny screen installs on the side of the injector, one on each injector

[@maadalmozani3036]

Please, I have a 1993 Caprice that has black smoke, incorrect fuel combustion, the engine sounds loud and low at times, and the engine is unstable and when driving the car it turns off

[@craigmincey2807]

Is it possible to change pigtails on car new TBI has been painted and has circle TPS while in fact I needed the flat TPS

[@williamgoring7605]

Where can beat you gaskets are that doesn't really matter that gasket really doesn't do anything but keep the throttle body up off the base they actually make a high-performance gasket that list a throttle body up off the base of that I think Summit Racing has I bought a spacer for mine between the manifold and the throttle body

[@azeissler1987]

Dis you ever figure out the small filter that goes into the side of your injectors?

[@davidwostrel]

Mine doesnt have those becuase there is two different versions.

[@azeissler1987]

@@davidwostrel You can see your injectors have the filter on the side in your video at 16:28 right above your thumb. I just rebuilt my TBI today. That's how I stumbled upon your video. It's a good video and I doubt not replacing the filters will effect much.

[@azeissler1987]

@@davidwostrel 16:13 is even a better view

[@bser3973]

I rebuilt my tbi about 3 or4 years ago. After I got done I found 2 little seals left over, what did I miss. They were about 1/8 of an inch in diameter. Thanks for any help, the truck seams to run fine.

[@davidmummert5066]

bser3973 fuel filters that go in the side of injector before reassembling

[@AllAmericanDreamChaser]

Very good video! Thanks!👍

[@MrBigmikeinaz]

little black screen was on side of injector body, should have been 2.

[@davidwostrel]

michael cabrera maybe it turned out that the distributor was fried

[@williamgoring7605]

There is a specific tool to scrape those gaskets is called a flat razor

[@cj8172]

Hi, great vid. I'm about to do this job. Has anyone tried the fuel pressure regulator spring upgrade? It bumps up the pressure from 11-12 psi to 14-15 psi. Just curious if anyones tried it and what they think after doing it.

[@lianna7217]

thanks!!! this helped a lot! make more vids!

[@robertcarlos78]

The small screens that you where trying to put somewhere else goes to the side of your injectors.

[@marcomarabel1328]

Did it fix your problem and what was the problem. I'm having problems when getting on to the freeway I get on it and it stumbles not all the time just some times idles good drives good starts good I changed vacuum lines and all sensor and EGR valve on intake manifold even thermostat and temp sensor still stumbling

[@davidwostrel]

Not what is was having issues with, the hall effect sensor in my distributor had shattered. Mine was barely running. I would make sure your timing is advancing. Is the brown wire connected?

[@markflo8412]

Did it run any better?

[@jesussoto2760]

Is there a Rebuil Kit Available ? An how much does it Co$t ?

[@The_Crasher-xj4el]

Do you think that me (with some decent engine knowledge) could rebuild the throttle body on my 5.7 on a weekend? Like would it take that long?

[@calebremsberg1718]

Takes a couple minutes... ive done 3 of em in an hr before....

[@charlesdouglas3179]

The tiny small screen goes into the side of fuel injections.

[@mxr20000000000]

Thanks did mine side by side your.

[@oIAEGIRIo]

Ive got an 85 Monte Carlo 4.3 CL and was concerned about the injectors and if there was a particular way to plug them up at the end

[@vciouus]

So the seals for the fuel injector go on the top of it ? Not the bottom ?

[@hidromecanicayconstruccion2599]

I do not put the microfilters of the injectors

[@alainapullock81]

great idea!!

[@CB71SS]

Just watched Maintenance Barn's video and the real little "O" rings go in the side of the injectors.

[@oIAEGIRIo]

I was wondering if there was a particular way you had to place the injectors. especially when you go to plug up the injectors at the end. I didnt know if there was a positive or negative layout.

[@davidwostrel]

jacob truitt there is a pin in the bottom of the injector that will prevent you from putting the injector 180 out of place, and the plug itself is coming from the front housing. so it should plug in right, there is another comment on the video about putting the screen on the right way. I have a feeling I didn't do that and haven't checked if they are straight.

[@oIAEGIRIo]

im pretty sure i put the screens on the right way im getting perfect spray out of my injectors. im about to drop my fuel tank and change the fuel pump because for some reason my car will randomly shut off especially when the temperature is high out side. but the fuel filter was dirty very dirty. any suggestions on the fuel pump or a reason why my car would be shutting off? it is all stock from 85.

[@davidwostrel]

jacob truitt only thing that I can think is that the pump coil might be over heating? how hot are we talking, also how long is it on before shutting down, because the pump is using the fuel for cooling... maybe causing pump to shut down till it cools or a vapor lock situation, not sure on that, I dont think a positive pressure system can even do that... so idk :)

[@oIAEGIRIo]

David Wostrel, it only does it after 20 minutes of driving even stop and go. and like I said it usually only happens when it's hot outside or I ha EA drove it on interstate

[@davidwostrel]

jacob truitt sounds like the pump is getting tired to me and is telling you it is on its way out :(

[@a.neuscheler5995]

great video! installing mine now, do the bolts or the fuel line nuts need to be at a specific torque poundage?

[@davidwostrel]

Oh I imagine... tight is how I put mine, about 30lbs, bone stock don't need to worry about the seal being sucked out or blown out.

[@jeromeromanski3196]

i'm really hoping somebody can help me, i have a 94 s10 pickup with a 4.3 1 of the tbi injectors weren't spraying i assume from sitting since last summer. now here's my problem i had my friend crank it over while i tapped on the bowl and it started to work the only problem is it's spraying too much fuel to the point its flooding the right side of the carb, the left one is pulsing normally but the right is a strong straight cone of fuel with no pulsing. any ides or help would be appreciated.

[@davidwostrel]

You running e85 in there? That shit will gum up after sitting you might need to replace the injectors. Check your tbi for greenish powder.

[@davidmummert5066]

Need injectors ultrasound cleaned.

[@nilknarf1596]

does anyone know the size of the torx bolts that hold on the fuel rail and injectors? I was replacing one of the injectors and gaskets and wouldn't you know it ... one of the longer screws went flying !!!! just one bolt is holding up this easy fix

[@davidwostrel]

Nilk Narf oh man that sucks! I would head to the junk yard to get the bolt or take the good one to a good hardware store and see what they have available

[@nilknarf1596]

yes sir, I took one ot the hardware store, I found a bolt that was the same diameter an thread, BUT the head stripped before I could torque it down. Im headed to a few junk yards this weekend,.crossing my fingers they don't make me buy a hole rail for one bolt

[@marshallbliss5275]

The small screens going on the side of the injector

[@jetzu93]

Hi men, what was the problem with your truck initialy so therefore decided to make this whole maintenance on your TBI system? I have the same 5.7 liter but I am not completely sure that this replacement of gaskets and o'rings it going to solve my idle problem. However some friends recommended me to do it. Thanks.

[@davidwostrel]

Jesus Zambrano turned out my distributor was completely screwed internally, there was no base signal for the injector pulses so it would not stay running when idling and would only run a little when reved past 20% throttle because the pulse management is controlled by the ecm at that point. It was pretty hard to find the issue because everyone kept saying "rebuild throttle body, replace fuel pump filter iac...."

[@robertbrading350]

I rebuilt my whole throttle body and yet my truck still runs high throttle any suggestions but when I pull back on the throttle cable it starts acting nomal

[@davidwostrel]

if it is not your idle screw or something interfering with the cable itself, I would look to see if your IAC is doing something incorrectly. Pull it out and see if the cone is dirty or the seat has some junk on it that would be allowing too much air into the throttle body

[@jimmyledford3047]

those tiny screens go in on the side of the injectors

[@jefferydaniels5650]

David, how do you replace the wires and clips for the injectors. Mine are cracked and look burnt. Actually I believe they just old. JD

[@davidwostrel]

something like this should work www.amazon.com/Fuel-Injector-Pigtail-Connector-12102568/dp/B0041IK318

[@jefferydaniels5650]

Thanks, didn't know what to call them. JD

[@josephgonzalez6329]

my kit says do not submerge tbi into water because it will mess up internal seals.

[@juanmarshall4083]

that's why he took it completely apart and take all the extra stuff off so he didn't have to worry about any internal seals

[@johnlonewolfe2325]

Can you soak parts stripped tbi in chem-dip?

[@davidwostrel]

Honestly couldn't see why not

[@javierrodriguez2919]

Anyone know if the 4.3 tbi the same as a 5.7 tbi?

[@charlescarey3575]

Yes, as far as I can tell they are the same I have both a 1992 Silverado 4.3 & 1992 Sierra 5.7 extended cabs and I recently put the fuel presser regulator and the fuel injectors from the 4.3 into the 5.7 the fuel regulators were adjust a little different between the two the tab thats part of the adjustment screw on the 4.3 was lower in the housing. with this one the GMC now starts better & runs a tad calmer, but it doesn't have the snap in the engine as it di with the original Pressure regulator with the tab quite as low as the 4.3 I could catch 2nd gear rubber with the original and now I cant even burn rubber in 1st gear I have an 4l60 atuo in the GMC And a 5 spd. standard in the Chevy. Also before i went thru gas bad, I'm hoeing now will be an improvement on gas guzzling. I hope this helped! I would be happy to hear any thoughts any of you have out there. thanks

[@michaelwheeler5238]

My rebuild kit came with two gaskets between the throttle body and intake manifold where it sits on the intake manifold. What gasket is correct?

[@davidwostrel]

michael wheeler if you watch you will see that i talk about the two gskets, it just depends if you have cross flow barrels or not ;)

[@michaelwheeler5238]

David Wostrel ok thank you so much. Awesome video! It helped me out a lot!!!

[@michaelwheeler5238]

What does cross flow barrels mean?

[@michaelwheeler5238]

My throttle body is exactly just lime you yours. Does that mean I use the one with the open in the middle of the gasket or the other one?

[@chuckchuckf.l.o.w4131]

What liquid do you clean it with

[@davidwostrel]

Dawn and hot water

[@justinhall8374]

the tiny pinhole on the side of the fule injector, closer to the middle- Thats where the screen goes

[@Joseph195357]

That little tiny round screen goes in the side of the injector

[@noahjefferynix1994]

helped alot

[@Clowe49444]

what are tool sizes used? wrenches etc:

[@davidwostrel]

Kurtis Lowe just basic tools, nothing crazy.

[@jeffreymcgee3905]

The little screen goes in the side of the injector

[@calebremsberg1718]

The small screen goes in the side of the injector...

[@rupertp.rutzki4868]

I like the speaking calmly over highspeed thing. Your volumen is mad lo tho.

[@vciouus]

How do I remove it from the engine ?

[@Lilmiket1000]

I had fun laughing at the really hard time you have holding that tiny little microscopic screen. lmao. It goes in the injector btw. Sure you already know by now.

[@davidwostrel]

Glad you got some joy our of it :D yeah it has been a few years.