1984 corvette idle problem
Thread Starter
2nd Gear
Joined: May 2026
Posts: 2
Likes: 1
1984 corvette idle problem
Hi there just wondering if anyone has had a similar issue before with an 84 crossfire corvette it started out to me with an ecu issue which has been fixed and since then the car has run however it has had an issue with idle from cold from cold the car really struggles to idle and usually has to have the throttle held slightly until it is warmed up its as if from cold the idle is too low to the point of stalling, however the main issue is that once warm the car then idles fine but one driving or even when revved stationary it revs up fine and back down as it should but its like it misses its point where it should idle falls too far and stalls out the same way as from cold, I should point out it has had new iac valves and had the wiring repaired to the tps along with a new tps, at the moment that is my main suspect as when I bought the car one of the tiny bolts for the tps had been snapped in the inlet I've tried to adjust it with 1 and it doesn't even seem to read the 0.525 volts properly im geussing because of too much movement without the 2nd bolt, so current plan is to retap the bolt hole and try to adjust again but if anyone thinks it could be something else or has experienced this please let me know i could do with a bit of advice 
Pro
Joined: Jul 2023
Posts: 546
Likes: 284
From: Marysville WA
In my case it was a faulty EGR valve and some vacuum leaks. You can read about my adventure here.
https://www.corvetteforum.com/forums...-stalling.html
Anyway still running great since then.
https://www.corvetteforum.com/forums...-stalling.html
Anyway still running great since then.
Thread Starter
2nd Gear
Joined: May 2026
Posts: 2
Likes: 1
In my case it was a faulty EGR valve and some vacuum leaks. You can read about my adventure here.
https://www.corvetteforum.com/forums...-stalling.html
Anyway still running great since then.
https://www.corvetteforum.com/forums...-stalling.html
Anyway still running great since then.
Thanks for the help its much appreciated only thing I should have said is the egr is blanked off and I have an ebl ecu with a map for no egr on it too however reading through your thread I wasn't aware there was a sequence when fitting new iac valves so I can also try that and then like you said go on a vaccum leak hunt
