IAC question? Help please
Thread Starter
Racer
Joined: Jul 2004
Posts: 279
Likes: 0
From: Jonesboro AR
IAC question? Help please
Can anyone give me a detailed description of how to reset the iac?
i have a 92 lt1 and it is running very rich. i had an exaust leak and it started running rich then. Now i have the leak fixed and it is running worse.
thx
i have a 92 lt1 and it is running very rich. i had an exaust leak and it started running rich then. Now i have the leak fixed and it is running worse.
thx
Melting Slicks
Joined: Apr 2004
Posts: 3,287
Likes: 7
From: n/a SC
Here you go
1. press slightly on gas pedal w/ key off, maybe 1/4" or so of pedal.
2. Turn key on to where you hear fuel pump activate and the display light up. You should hear a metallic "clack" sound come from the throttle body area of the engine compartment. That s the IAC pintle cycling.
3. Start engine while holding the pedal in as described in #1, let off as son as engine starts and runs.
4. Let engine run 5 seconds then shut down.
5. Wait 10 seconds and the start the engine normally with foot OFF the gas pedal. Engine may crank a couple seconds longer than usual for this start up, that is normal right after the reset.
6. reset procedure is complete.
1. press slightly on gas pedal w/ key off, maybe 1/4" or so of pedal.
2. Turn key on to where you hear fuel pump activate and the display light up. You should hear a metallic "clack" sound come from the throttle body area of the engine compartment. That s the IAC pintle cycling.
3. Start engine while holding the pedal in as described in #1, let off as son as engine starts and runs.
4. Let engine run 5 seconds then shut down.
5. Wait 10 seconds and the start the engine normally with foot OFF the gas pedal. Engine may crank a couple seconds longer than usual for this start up, that is normal right after the reset.
6. reset procedure is complete.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
By "running worse" is it still the running rich issue or is it an idle speed or stability problem?
If running rich with no air leaks you may have a problem with an O2 sensor or the ECM's coolant temp sensor.
If running rich with no air leaks you may have a problem with an O2 sensor or the ECM's coolant temp sensor.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by reed62783
every1 agree this is correct?
thx
thx
The procedure I've seen most often involves jumpering the ALDL. The step-by-step should be in the Tech Tips section.
Jake
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Why not reset as according to your manual?
Your manual says the procedure for resetting the IAC is to drive the car at or above 35 MPH...
I personally would not want to turn the engine on and off for 5 second shots
Your manual says the procedure for resetting the IAC is to drive the car at or above 35 MPH...
I personally would not want to turn the engine on and off for 5 second shots
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Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
The method posted for resetting the IAC is the only one I've ever seen (whether it be for an L98, LT1 or a GM V6 for that matter - it's always the same). The only reasons to reset are if you replace it, or on those cars with a minimum idle adjustment, after you complete that adjustment. Post more specifics about what's going on with your Vette. How do you know it's running rich? If you've captured some scan data - post those #'s.