Throttle at idle issue
Thread Starter
Racer
Joined: Jul 2013
Posts: 275
Likes: 1
From: Colorado Springs
Throttle at idle issue
I was having a problem with stumbling when cold and high idle when cold, did a little investigating and found a vacuum leak, repaired the leak.
The car runs 100x better, no stumbling but at idle the car idles at 1200 RPM - once you hit the throttle the car returns to 900 RPM every single time.
Great example is, pull up to a stop sign, hold the clutch in and the car sits at 1200 RPM then if you hit the gas real quick the car returns to 900 RPM.
I have not unplugged the battery since finding and repairing the leak, could the ECM need a reset (hate losing my radio stations), or do you think it's a Throttle Position or Idle Air Sensor issue?
The car runs 100x better, no stumbling but at idle the car idles at 1200 RPM - once you hit the throttle the car returns to 900 RPM every single time.
Great example is, pull up to a stop sign, hold the clutch in and the car sits at 1200 RPM then if you hit the gas real quick the car returns to 900 RPM.
I have not unplugged the battery since finding and repairing the leak, could the ECM need a reset (hate losing my radio stations), or do you think it's a Throttle Position or Idle Air Sensor issue?
Team Owner
Joined: Jul 2004
Posts: 28,353
Likes: 3,253
From: Hartford WI
Have you cleaned the TB and the IAC housing and all the passages? Set the timing and/or make sure it is right. After which you can use a scanner to see exactly what the idle speed is. Also check the IAC counts, should be around 20 counts give or take. Then set the TPS.
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
Lengthy thread, but first post may help ( may not be applicable to your '88 ):
http://forums.corvetteforum.com/c4-t...dle-speed.html
http://forums.corvetteforum.com/c4-t...dle-speed.html
Last edited by don hall; Sep 15, 2013 at 11:20 PM.
Thread Starter
Racer
Joined: Jul 2013
Posts: 275
Likes: 1
From: Colorado Springs
Lengthy thread, but first post may help ( may not be applicable to your '88 ):
http://forums.corvetteforum.com/c4-t...dle-speed.html
http://forums.corvetteforum.com/c4-t...dle-speed.html
