todays problem...
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
todays problem...
Weird thing has been happening lately. Any thoughts???
91 vette, L98 6 spd...
Start the car, service engine soon lights up, car idles very fast (2000rpm), studders and sputters from takeoff, sometimes stalling.
Turn car off, wait a few seconds, restart car, no ses light, car idles normally and runs fine. WTF???
91 vette, L98 6 spd...
Start the car, service engine soon lights up, car idles very fast (2000rpm), studders and sputters from takeoff, sometimes stalling.
Turn car off, wait a few seconds, restart car, no ses light, car idles normally and runs fine. WTF???
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Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
I'd go with the IAC and a dirty throttle body. Everytime you turn it off, pintle is retracted to allow plenty of air for a quick restart. Sounds like yours is doing that - fast idle after it's started - but the pintle doesn't extend to commanded idle and there's too much air when you drive off which makes it lean. It does however work once you turn it off and restart it. There are no codes because it's in Open Loop and the O2 isn't warm enough to show the Lean condition. Get some throttle body cleaner and spray it inside the throttle body or take it apart for a more thorough cleaning.
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
I'd go with the IAC and a dirty throttle body. Everytime you turn it off, pintle is retracted to allow plenty of air for a quick restart. Sounds like yours is doing that - fast idle after it's started - but the pintle doesn't extend to commanded idle and there's too much air when you drive off which makes it lean. It does however work once you turn it off and restart it. There are no codes because it's in Open Loop and the O2 isn't warm enough to show the Lean condition. Get some throttle body cleaner and spray it inside the throttle body or take it apart for a more thorough cleaning.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The ECM recalibrates the IAC every time you cycle the ignition on and off.
No adjustment needed to a new one. Just push/screw the pintle all the way in before installation and cycle the ignition to recalibrate.
No adjustment needed to a new one. Just push/screw the pintle all the way in before installation and cycle the ignition to recalibrate.