Idle Problem
Thread Starter
Safety Car
Joined: Feb 2003
Posts: 4,575
Likes: 369
From: Ozark, MO
C5 of the Month 6/13
Idle Problem
I'm having an idle problem with my 92. On occassions, while sitting at stoplights, the car will automatically rev up and down. I really have to hold the brake to keep the car from moving forward. I believe the highest it has rev to was around 1200rpms, which is pretty loud with the flowmasters. The symptom seems to get worse when the engine temp rises. It may be a faulty IAC value or a dirty throttle body, but I'm not sure. Any ideas?
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
A/c on or off? If the a/c is on, PCM may not be getting the a/c request signal. IAC tries to compensate for the load, but doesn't really know what to do, so the idle surges. Hooking up a scanner will take the guess work out of it.
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Originally Posted by Johnson 92
I really have to hold the brake to keep the car from moving forward. ?
That's one of the symptons listed in Helms I believe...
anyway mine did that, when the IAC was replaced, it went away. You could also try cleaning it instead of replacing it...
Advanced
Joined: May 2002
Posts: 65
Likes: 0
From: Vinemont Al
If your car has lot's of miles you might want to check the throttle body shaft and see if it had much wear. A lot of wear will tend to keep the throttle from returning to the fully closed and may also leak. I have read several articles on this matter.
If I can find them I will come back and post the link.
If I can find them I will come back and post the link.
Advanced
Joined: May 2002
Posts: 65
Likes: 0
From: Vinemont Al
Originally Posted by Johnson 92
I'm having an idle problem with my 92. On occassions, while sitting at stoplights, the car will automatically rev up and down. I really have to hold the brake to keep the car from moving forward. I believe the highest it has rev to was around 1200rpms, which is pretty loud with the flowmasters. The symptom seems to get worse when the engine temp rises. It may be a faulty IAC value or a dirty throttle body, but I'm not sure. Any ideas?
http://www.dvcorvettes.com/clean_air_passage.htm
