91 GMC C3500 454 350 TBI TPS Idle Adjustment
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- เผยแพร่เมื่อ 16 ต.ค. 2017
- Checking and adjusting the TPS (throttle position sensor) on the 91 GMC C3500 dually with a 454 big block V8 7.4 engine. Mine was out of adjustment.
Things that might help with a project like this:
Multimeter: amzn.to/2FYOXon
AC Delco TPS: amzn.to/2RWRu91
This video contains affiliate links, which means that if you click on one of the product links and buy, I'll receive a small commission. - ยานยนต์และพาหนะ
Things that might help with a project like this:
Multimeter: amzn.to/2FYOXon
AC Delco TPS: amzn.to/2RWRu91
This video contains affiliate links, which means that if you click on one of the product links and buy, I'll receive a small commission.
Great informative video moss. I am very pleased to see this helped your OBS rig out. Keep up with that great content friend.
Thanks, this worked out great for me.
mossman381, you did a really good job.
Quite ingenius , thanks a bunch for the info
WOW that makes a lot of sense my 94 Silverado Idols at 1800 after warming up it drops down to 1200 yeah I’m firing my mechanic thanks for the info and I’m going to give that a shot 🤞🏼
Did you find your high idle yet?
hey, we are a new generation of folks who are learning these trucks, thanks for sharing. these tbi system drove many a man to drinking in the 90s.. ha
We are at our end here with a 93 GMC Sierra check engine light keeps coming on transmission goes into emergency mode
thomas g you fixed it or just abandon it?
My 94 suburban Silverado edition TBI idle is very low ? How can I fix it
@@worstnightmare9772 CLEAN TPS? check fuel pressure, check fuel pressure regulator
check IAC motor and clean pintle
Good fix
I did this awhile ago and it's working great.
mine reads .49 volts and it idles about 600 to 700 rpm hope that helps
Had an 89 suburban 2500 4x4 high idle, turned out to be the tb gasket had a wrinkle causing a vacuum leak. The computer would eventually adjust it down.
Anyway to dial back the sensitivity on the TBI off idle? I need more pedal travel before the truck takes off.
I put a new throttle cable on my 94. Can also try cleaning the TB blades with TB spray cleaner
I bought the SMP ""standard" quality sensor amd mine read 0.72
Before you go hollowing out screw holes in the TPS sensor there is a mechanical idle adjustment on the driver side front of the throttle body you can adjust while looking at your meter and get your.58V. It may be behind a block off plate. The screw is a torx head. Just my 2 cents.
-Jon
Pretty sure you can't adjust the idle on these TBI trucks. Just my 2 cents.
@@mossman381 Well there is a mechanical idle adjustment on my '88 Chevy TBI. You'd have to pull the block off plug out to access it. Ask your source for the other information you got. It's there.
@@mossman381 100% you can just take the metal plug off the front drivers side of the tbi and there it is a torx screw
@@lucianorodriguez1791 Isn't it blocked off for a reason? They don't want you to mess with it. I would rather adjust the sensor than mess with the throttle body adjustment that they don't want you to mess with.
it is extremely difficult to get that plug out. i wish i would have messed with this sensor to begin with.
hi mossman381 great video there my friend by the way I'm just wondering are they any good chrome bumpers order to fit my truck I got a 95 GMC K 1500 Sierra I'm just trying to find a good second-hand one rear one
Finding a good used one will be pretty hard. They are getting older and the bumper usually takes the most abuse. My rear bumper is rusted. I am going to just order some new aftermarket bumpers on Ebay. I have gotten good aftermarket bumpers for my 2000 and 2002 in the past. I will do a video when I do order them.
.45 👍
Quick question, I have a 92 Chevy C1500 with the 5.7L. I’m currently experiencing issues of it wanting to stall out when I come to a stop after driving it for 35+ minutes. I’ve changed the idle air control motor, I rebuilt the throttle body, I’ve changed out the fuel filter. I’m wondering can it be the TPS? Is it also possible that my fuel filter is plugged up? I just changed it less than 2 months ago but when I bought the truck I know it was sitting for a few months.
I would check the TPS like I do in the video. Have you changed your O2 sensor?
@@mossman381 no I haven’t yet, could that be my issue? I’m just trying to figure out what could be wrong as it’s not throwing any codes
I wouldn't trust the codes on these early trucks anyway. I would check to make sure your TPS is giving the right signal and then change the O2 sensor so you know it's good. Even if the O2 sensor isn't bad your truck will run so much better with a fresh one. I think if the fuel filter was plugged it would run bad all the time. Also get a new PCV valve. Have you done a major tuneup? Plugs, wires, air filter. rotor, distributor cap.
@@mossman381 yes I have replaced the cap and rotor, plugs and wires, PCV valve and air filter. I originally started with the cap and rotor because I noticed that there was ?rust inside the cap and I’ve been replacing basically everything from that point on because I’m not sure when any of it was changed out last. But I’ll definitely check the TPS and see what it says.
@@mossman381 I just tested it and it starts with a reading of 0.53-0.54 (it jumps back and forth) and when I move the throttle it does climb up to 4.43
My truck idles around 1200 and stutters a bunch when I first get on it. I'm guessing it's the TPS but I'm not sure. Any thoughts?
When working with these older trucks start with the basics. The pcv valve is probably a good start. You can check your tps before buying a new one. Vacuum leaks can cause these problems. If you just bought the truck or it hasn't been worked on for a long time I would recommend doing what they call a major tune up. That would be spark plugs, wires, distributor cap, rotor, fuel filter, air filter, oil change. A lot of times that will not only fix problems but make the truck run much better and make it more reliable. O2 sensor would be another good thing to change if it's never been done. Good luck.
mossman381 many thanks, I have done the major tune up so that’s why I turned to the TPS. Looking at it now it’s all wire nutted and messed with.
You want to clean the rats nest wiring up. Check your engine ground or make a new one.
is your oil pressure really 50 at idle, I replaced my oil pressure sensor and its abt 20 to 25 after warm up
That is what the gauge reads. I have seen a few 454as trucks with the same oil pressure reading. Seems high but have had no issues.
Chevy's from that era read all over the place. Gauge really only good to let you know that you have pressure.
I think the computer gets confused when it sees the wrong voltage and starts defaulting back to base idle , then it tries again, cuts back on fuel, then just keeps looping in a surge.
This truck has been running pretty good since the adjustment and some new parts.
@@mossman381 my tps reading at idle position is .78 so im drilling the holes longer to try and get it to .50 . I will try that today and see if it works. my truck starts fine, and will do a surging idle sometimes for a few minutes, then levels out, then sometimes high idles, the when truck is warm good, it idles ok.. it seems like when in open loop, it cannot find happy.
@@mossman381 was your truck surging or only high idle all the time?
@@randy1ization No surging, just a high idle.
@@randy1ization I replaced a few parts on this truck. Check the playlist to see those.
"a guy told me..." Maybe find the spec for it eh ?
here is how to lower the idle hope this helps
th-cam.com/video/nJkPgkMpTFs/w-d-xo.html
Still too high though
That’s not a tpi motor
Slow down and read the descriptions. TBI
What video, why make a video if you're not gonna instruct anything or show us something. What a joke ...lol
Kiss...…..My...…...A$$
mossman381 no thanks I wouldn't kiss your ugly stankn ass, so kiss your own stankn ass!!!
And you look like you model on the side...............….NOT. Those 5 verses change you life yet. And you say my video is a joke.
I am guessing you need stronger knees because you are a fat a$$.
mossman381 your funny, but I don't have the time to be entertained ok dud