Tuned Port Injection Description and Tear Down in 15 Minutes
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- เผยแพร่เมื่อ 10 ก.ค. 2024
- #howto
#tunedportinjection
#firebirdformula
Basic description and bench tear down of the GM Tuned Port Injection system installed on C4 Corvettes and 3rd Gen Fbodies. Be sure to check out my other videos for more cool Corvette and vintage car parts -
Cars and Parts Tear Down Videos: • Corvette and Parts Tea...
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Thanks for watching!👍 - ยานยนต์และพาหนะ
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To see more of my vehicle/ parts tear down videos check out my playlist below -
Cars and Parts Tear Down Videos: th-cam.com/play/PLAM-V1w3acpg_B2sVlXEL7UPOGVwiKmtL.html
How much you want for that throttle body?
What specific year throttle body are you needing?
@@VetteSource 1987 IrocZ 305 TPI Vin=F
Ok, I should be able to take care of you. I can be reached by phone @ 832-654-7367 or email vettesource@hotmail.com 👍
@@VetteSource ok thanks I'll call in a week or so I'm a trucker and extremely busy right now
Thanks for posting! God bless people like yourself to take the time document and film this stuff to educate others. I just purchased a 91 Formula with 350 TPI and am enjoying getting under the hood and understanding how all this stuff works and such. Always wanted one of these back in the day, and now I have one.
That's awesome! Glad to do it. You didn't happen to buy the really nice red/black one that was on the East Coast, did you?
@@VetteSource I very may have! The Red Formula with 64,000 miles?
@@delfmeek that's the one! I was VERY close to pulling the trigger on it when I saw it listed for sale. I had to check myself because I knew I wouldn't be able to give it the attention it deserved. I am glad to see it found a good home. I am sure you will have a blast with it. Let me know if you ever decide to sell it😁
@@VetteSource Will Do! It's actually in transit on it's way here. I'm in Oklahoma and it's making quite the long voyage here. It should be here next week. I'll see if I can get a video posted when it arrives. I had a 1991 firebird (non-formula) equipped exactly like it back when I was younger, and always wanted a Formula version. I personally think these third gen Firebirds/Camaros are a bit undervalued
@@delfmeek that's for sure. They are incredible bargains compared to the IROC-Z's and look just a bit better in my opinion. You will have a blast with it. Looking forward to seeing some of the vids once you get it.👍
A few things: they are throttle de-icer hoses because in northern states the throttle plates would freeze and stick. The stock injectors on a 5.7 TPI were 24 lb injectors. The vacuum port on the throttle body is actually port vacuum used for the EGR valve. If you hook up the EGR valve to one of those rear manifold vacuum ports, as you stated, it will kill the engine at idle, because it is supposed to be opened by port vacuum not manifold vacuum. The lower runner bolts are always torn up because the valve covers are in the way when on the car, so the angle to reach them is sharp, a wobble extension usually helps to keep you from stripping them. FWIW
Good info, thanks for sharing👍
Awesome video Brother. Thanks from Honolulu Hawaii
(Team 1987 Pontiac Trans Am GTA)!
Hey buddy, thanks for the feedback, glad you enjoyed it👍
Excellent Footage and great explanation of parts. Just purchased my dream IROC which houses a 305 TPI. My service engine light is on and assume its the EGR mechanism. I now know where it is thanks to you
No problem, glad I could be of asistance👍.
Hey Jeff, I have a 90 vett. Darn near drove me nuts with EGR issues. Yeah, yours is a 305 TPI and mines a 350. But the EGR valve and vacuum lines run near the same. I went through 3 new EGR's that couldn't hold vacuum psi. Two of them Delco and one standard. If you're going to remove and replace, do yourself a favor and Check that it will hold 15 to 20 psi. before install. Save the old parts just in case. My vett has a solenoid Vacuum that runs to the EGR that attaches to the back bolt on the thermostat cover. Another new part that failed. It had a crack. Ended up reusing the old one to correct that. I also found that the plastic vac. line fittings, along with the hoses turn to rubbish after 30+ years. Had a cracked Y fitting that ran to that solenoid. had to smoke test to find that one. Runs like a champ now, but getting there was a pain. Good luck with yours. Hope this helps.
Thanks for the information. I have heard the problem goes deeper than a New EGR and you just confirmed that because new EGR did failed to eliminate the SERVICE ENGINE Light. I have a mechanic neighbor who has an OBD1 reader (who would of thought) and he loves my car as much as I do! He is assisting me in trying to find the issues. @@tonysteppan8495
I know this is an older video, however, it is full of great information on how to dissemble the TPI. You made it look easy, I like the fact that the top comes off exposing the EGR etc. without taking it all apart. The con of this video is the shaky camera, man if your prone to motion sickness you don't want to watch it to closely. You need a camera stand for us guys that suffer from motion sickness. Thanks form the great information.
Yep, a more secure camera stand is on the list for 2022. Have a Merry 🎄
@@VetteSource You too Merry Christmas..
Thank you for the info, this design was super ambitious for 1985!
Not a problem, glad to do it. It definitely was a design right out of the rocket ship playback. Still looks awesome today👍.
this'll definitely come in handy thanks for sharing!
Thanks for the feedback, glad it was helpful.👍
Thank you for the video. Very simple system.
no problem, glad you enjoyed it.
Lots of good information thank you for the video
No problem. Michael. Glad to do it👍
Great vid!
Great!, glad you enjoyed it. Be sure to watch out for the continuation of this tear down series as I do a top end intake job o the Yellow Gold Formula 350 -
th-cam.com/play/PLAM-V1w3acphkZJyLroCKcyLO9GzqR6q4.html
Thanks for watching!
Can't wait to get under the hood and see what's wrong with my vette, this video definitely will help
No problem, glad I could help out.👍
Nice work 👍
Glad you enjoyed it👍
Bless you brotha thank you
No problem, glad to hear it was helpful👍
Nice job!!
Thanks, glad it was helpful👍
Thanks so much for posting this video. It's very helpful since I have a 86 camaro z28 305 tpi motor that I don't know very much about.
Hey Harry, glad you enjoyed it, and I could be of assistance👍.
I did enjoy your video.
I used to be a Camaro person, but became a Foxbody person after being introduced to the 5.0.
I've always wondered how the TPFI system worked, I appreciate the info.
That said, man I absolutely am convinced the Foxbody Mustang is wayyyyy easier to work on and break down after watching this.
Glad you enjoyed it. I like the 5.0 too. I have a MKVII I gave to my son and it's very simple to work on. The TPI, while awesome to look at is like trying to put together a 5000 piece jigsaw puzzle.
@@VetteSource 😂 what I thought too (puzzle) 🤣👍
It's a good day when you come across an L98 TPI car. The F bodies didn't seem to make it this far compared to all the fox body Mustangs you still come across.
That's for sure. I feel fortunate to have 2 TPI cars that are mostly original. I think the complexity of the TPI intake is how many of them have been lost to time. Many owners just ditched the intake and put a carburetor on them when they began to experience problems.
Impressive one-hand operation!
thanks, i've gotten pretty good with that over the last several years of making videos
@@VetteSource just took apart my TPI on my 91 Z28 to change our the fuel injectors. Any tricks to stop the fuel lines from dripping in the meantime?
I disconnect the fuel lines at the sending unit to stop the eternal drip, but those lines are harder to access on the f-bodies . I would recommend removing the fuel cap, and disconnecting at the filter. That should do the trick.
@@VetteSource Ye olde golf tees wrok too!
@davidlubin7389 good idea, I'll have to try that👍.
Excellent, love it. Thanks!
Awesome! Glad you enjoyed it👍
man i want to thank yu for your videos i was like if i don't find anything like this ill make some videos, good info my 85 corvette has had a knocking noise for over two years and i think it may be in the lifters but i didn't want to tackle taking this aart until now i seen your stuff. now it looks fun lol other than that it run pretty good in limp mode but rough with no codes in closed loop i tell you went the car runs right its quick and fun so i want to keep it. changed the maf today still runs like a vacuum leak unless i unplug the maf or burn off module which either one will put it in limp mode
thanks man, glad to share the knowledge among my fellow gearheads. Sounds like your car just needs some top end work to start. You can also check to make sure you are not seeing low oil pressure at idle when hot. One other trick is a lower end knock will sound different depending on where the problem is. With rod bearings it will be a light tapping sound that accelerates with engine RPM. With a main bearing it will be a deeper heavier knock that is very distinctive. Thanks again for watching buddy, have a good one.
I guess I'll try it. Wish me luck
You'll get it. Just be patient and go slow. Let me know how it turns out👍.
Great video I have this engine I have white smoke coming from back and when cold starts my motor sounds like it wants to shut down? Then kicks back up. I know it's not normal for the engine to do that but don't know where to start fixing issue?
Glad you enjoyed it. My first thought would be a fuel injector that's hanging up on you. You can pull the plugs to see if they're wet or fouled. The fuel rail can also be pulled up to see what the injector spray pattern looks like, but that requires a bit of teardown and caution when opening the fuel system in that manner on a TPI. Let me know how it goes👍.
Hey Brian! Great video!!! To remove the Intake Air Temperature sensor, do you have to take the plenum off, or can it be removed with the plenum attached?
Hey buddy, unfortunately the plenum will have to be pulled in order to reach it.
Great explanation! Im getting into a small block 400 that has a Corvette TPI married to it. I didn't build the motor so i dont know what's been done to it but your explanation raises a question in my mind. This motor was built for a drag car. They would have had to put larger injectors in this thing to make it work with a 400 ci motor correct?
Possibly so, it depends on the cam/intake port/combustion chamber size. Even with heavily modified TPI topped motors, most of the time you can get away with 24lb/hr injectors. It is when you get into turbocharged/blown/nitrous motors that you need to begin looking at larger injectors. Thanks for watching!
More videos on the GM TPI Camaro and the AC
Will do👍
Thanks for reminding me what I forgot!
No problem, glad to help. Not the fastest but still one of the best looking fuel injection systems out there.👍
@@VetteSource C4 ZR1 LT5 is by far one of the most beautiful engines in automotive history.
Oh yea, it's a very impressive engine. One of my favorites as well. 👍
Hi Brian. Your more than helpful. But we have an issue with getting the last bolt out by the drivers side on the intake tube. The metal break vacuum hose is in the way. We can't get to the clamp to get that off. Any ideas.
@@BSmith-md9wi are you trying to get the rear bolt that faces inward, or the rear bolt that comes from the inside facing towards the outside of the engine.
I’m not a mechanic and have a question in regards to a tpi system. Car has a lot of miles don’t know if engine was ever rebuilt. However car is running very rich . Also having a lot of issues with idling . Would it make sense to take apart the tpi and give it a clean up new gaskets get valve and clean injectors . Please excuse my ignorance as I said I’m not a mechanic just thinking if things that I might do to help make it run better
Hi Shannon, before you tear into it, have you hooked the car up to a scanner to see if there are any trouble codes in the ECM? With a rich idle condition, the air/fuel ratio of 14.7 to 1 is not being met, and in many cases is being caused by one of the primary air intake sensors such as the Mass Air Flow or Idle Air Control. Also, the injector internal seals could also have failed and will dump too much fuel into the cylinders. Even a faulty ECM can cause the problem you are describing, so it's best to start there first. Let me know what you find out👍.
Do you know where I can get that egr vacuum line as well as the vacuum line for the fuel pressure regulator please? Mine where burnt due to sun damage and need to replace them
I think it's Dorman that makes a vacuum line repair kit for the 80's GM and Ford cars that used this style of tubing. I believe the brand name is Mighty Vac Line Repair Kit or something to that effect. I would check the HELP section of your local auto parts store to see if they stock it.
Does this engine have the Throttle Body Bypass Attached as shown? I have a 305 TPI and want to bypass mine.
No, I believe this one was still in stock configuration
I have wondered how to tell the f-body and the vette apart. The distributor cover is also different. Plastic on the f-body and magnesium on the Corvette.
Exactly. I have always wondered at the difference in materials between the two and how that decision was made. My guess is the heat produced under the hood of the Corvette might cause the plastic units to melt. Thanks for watching👍
@@VetteSource I agree but also think it's for protection as well. On a C4 there is a relief on underside of hood/ front clip that rests very close when shut
@@VetteSource I agree but also think it's for protection as well. On a C4 there is a relief on underside of hood/ front clip that rests very close when shut
@@hayleybmadiggunter6798 good point. There is definitely quite a bit of cowl shake on the early C4's so that may have been a way to protect the distributor from being damaged. Never thought of that before.
I have an 85 z28 with the 305 tpi engine. If i put a 350 in it can i use the same intake and just put bigger injectors in it?
Yep, everything on the intakes is the same with the exception of the fuel injectors. As long as you switch over to the 22 lb/hr injectors you should be fine. Thanks for watching👍
305 was same size physically only bore/stroke on 305 were different
do you have to re program the stock computer?
No, these computers are very simple, so other than installing a performance PROM, there wasn't anything else you could do to them.
Did the TPI come out of the car like this or did you have to take it apart to get it off the car?
It would be nice if it was that easy, but no it didn't. I have a another series of videos detailing the teardown of the TPI intake. Here is the link if you haven't seen it -
th-cam.com/play/PLAM-V1w3acpg9ThDD75FSzjNaemyMEJLl.html
@@VetteSource ok thank you!
@@fishwateraquatics no problem, buddy👍
My 350 TPI also has the TPS adjusted the way you have it. Is there a reason to set it like that and not to factory spec?
Not sure why it was like that. This was from an engine I had torn down many moons back. They may have been trying a custom setting to see how it would work.
@@VetteSource I'm interested because the previous owner had set mine like that as well and although mine runs well, it usually needs some throttle to start. You think it may have to do with the tps setting?
Yea, that usually the first thing you'll notice is throttle needed to start with it being set outside of the factory specified limits. I seem to remember people setting them like back in the day, but for the life of me I can't remember what the rational was for it.
@@VetteSource thanks for the help. I'll adjust it to spec and see how it does. Btw, your teardown videos are very educational, if you ever do a step by step on how to measure/adjust timing on a tpi, I think it would be really helpful to guys learning these engines.
That's a good idea and is on my video to do list. Once I find enough time to finish getting the top end of my Formula 350 reassembled I'll be going through the steps required to dial it in. Let me know how it turns out with your car👍.
Galvanized corossion...
It's not good to heat aluminum up as it changes the chemical structure, allows intergranular corossion to occur too.
TBI is not a half carburetor.
I would replace all of those torx bolts with hex bolts and use a teflon washer or switch to an al based bolt...
TPI is basically a tunnel ram that LS engines can have
Ok, thanks for your continued input. Seems like you have plenty of knowledge.
Do you happen to know how strong the block is? I have one its been bored 40 over cant find anything on this block just dont wanna spend the money if the block is weak
The 350 castings from this generation are still pretty stout. 40 over isn't bad, but I would inquire why they chose to go with that size overbore versus a 30 over which is usually the standard.
@@VetteSource he said it cleaned up good at 40 i iamine it was seting around for awhile before he slod it to me
Ok, if it cleaned up ok I wouldn't hesitate to use it for a build. Just don't expect it to hold up for long with twin turbos pushing 1000 HP😁
@@VetteSource ok thanks im realved now only going to run about 5 to 6 hundred max thanks for all the help
No problem. Glad to do it👍. Let me know how it turns out.
For some reason I’m getting “No stream Tap to retry” it won’t play for me.
Are you using an iPhone or Android? I had somebody in the last that had the same issue with his iPhone.
VetteSource iPhone
I’m able to view you other videos
@@wadecreighton4584 yea, it seems to be an iPhone compatibility issue. The exact same thing happened to user 750iV12 3 months ago, I never could figure out how to make it work for him. Sorry about that, man
VetteSource I just watched your TPI field strip what a great tutorial if you could do a vacuum line tutorial that would be great!!! Thanks for your help. I have a 1991 camaro 305 that I bought as a project and found that the previous owner did a lot of deleting.
Same as all new engine basics.
yep, just better looking in my opinion. Thanks for watching...
Mate your videos not playing?
That is odd. Never had that happen before. Any chance reloading page helps?
Yeah I been trying couple days now, all it says is “No stream Tap to retry”
@@750iV12 are you using an Android or iPhone?
VetteSource I’m using IPad, all your other videos work.
@@750iV12 definitely weird. Try clicking this direct link and see if it works that way -
th-cam.com/video/TjkGLb_DYPk/w-d-xo.html
TPI went to 95.
You're off by a few years. 92 was the last year for a factory installed Tuned Port Injection in GM cars. Thanks for watching👍.
@@VetteSource yes 92 then the lt1 came to play. A link to one of my little tpi projects this one's a 305 with twins.
th-cam.com/video/zN1FWpkNBmk/w-d-xo.html
Very 😎, I'll be sure to check it out more thoroughly later👍