The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.
Removal & Installation
- Disconnect the negative battery cable.
- Detach the IAC solenoid connector.
- Remove the two retaining bolts and remove the IAC solenoid and gasket from the throttle body.
- Installation is the reverse of the removal procedure. Use a new gasket and tighten the retaining bolts to 71-97 inch lbs. (8-11 Nm).
- Turn the ignition switch to the OFF position.
- Disconnect the wiring harness from the IAC valve.
- Measure the resistance between the terminals of the valve.
- Resistance should be 7-13 ohms.
- If resistance is not within specification, the valve may be faulty.