Fuel Delivery and Air Induction: Service and Repair

IDLE LEARN PROCEDURE: Any time the battery is disconnected, the programmed position of the Idle Air Control (IAC) valve pintle is lost, and replaced with a default value. To return the IAC valve pintle to the correct position, perform the following procedure:

1. Restore the battery power and place air conditioning controls (if equipped) in the "OFF" position.
2. Set parking brake, and block drive wheels.
3. Start the engine and shift the transmission to "Drive" for automatics, or "Neutral" for manuals.
4. Allow the engine to run until it reaches normal operating temperature, then an additional two minutes.
^ This procedure allows the Electronic Control Module (ECM) memory to be updated with the correct IAC valve pintle position, for the vehicle, and provide a stable idle speed.