Please help :(
Thread Starter
Intermediate
Joined: Sep 2025
Posts: 25
Likes: 1
Please help :(
Hi all, I am having an issue with my 86 vette that I just can’t figure out at all. My car is stalling, and also fluctuations in rpm between 300 and 1200(sometimes results in below 300 then it stalls). I have a new MAF, new IAC, new TPS, and tested for vacuum leaks and absolutely nothing. The only thing I know is the tps sensor wire has a little fray in it (some copper strands are hanging off) could this be the problem? Thanks so much.
Thread Starter
Intermediate
Joined: Sep 2025
Posts: 25
Likes: 1
Voltage on the TPs is low, it’s .45. I wasn’t able to get it higher because the actual TPS wouldn’t rotate enough. Is .45 an issue? I know it’s supposed to be around .54 but I’m not sure. Also, the wires are a little frayed which may be an issue
Racer
Joined: Mar 2025
Posts: 485
Likes: 230
You should be able to get it way past that. Are you sure its positioned properly?
Thread Starter
Intermediate
Joined: Sep 2025
Posts: 25
Likes: 1
I think so, brought it to the shop because I was completely lost and had no idea. They brought it back and it was still the same. It won’t rotate more. I’ve tried to get it to, but it doesn’t want to go past .45v
Team Owner
Joined: Jan 2003
Posts: 20,290
Likes: 239
From: Summerland B.C. Canada
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Burning Brakes
Joined: Aug 2008
Posts: 823
Likes: 215
From: Tampa, FL
This video might help. It's for the TPS that's the one on the 84 Corvette... so while this won't look like yours, it's still relevant and still applies. Remember, it's not just what it says at rest, but what it says at wide open throttle too. It doesn't have to be perfect, but you need a decent range. If the TPS isn't providing a decent sweep, you're going to get stalling and performance issues. This video goes over all of that:
I also think it could be a problem with your Idle Air Control valve, which this video can also help with as well. The IAC valve will basically be identical to yours, just in a different GM car, but the video still applies:
I also think it could be a problem with your Idle Air Control valve, which this video can also help with as well. The IAC valve will basically be identical to yours, just in a different GM car, but the video still applies: