Computer Command Control - Port Fuel Injection

To reset the Idle Air Control (IAC) valve pintle position, proceed with the following:

1. Block the drive wheels, and apply the parking brake.
2. Start the engine, and hold the engine speed above 2000 rpm. Ground the diagnostic test terminal (ALDL) for ten seconds, then remove the ground.
3. Turn the ignition "OFF," then restart the engine and check for the proper idle operation.

The Idle Air Control (IAC) valve may also be reset by the ECM when the vehicle is driven at a speed above 40 mph. Ignition may have to be cycled "OFF" and "ON" a few times before proper idle can be obtained.