K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Idle Speed/Throttle Actuator - Electronic: Service and Repair
IDLE AIR CONTROL (IAC) VALVE REPLACEMENT
REMOVAL PROCEDURE
1. Disconnect the idle air control (IAC) valve electrical connector
2. Remove the IAC valve attaching screws (4).
3. Remove the IAC valve (3).
4. Remove the IAC valve O-ring seal (2).
NOTE:
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Do Not push or pull on the IAC valve pintle on IAC valves that have been in service. The force required to move the pintle may damage the
threads on the worm drive.
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Do Not soak the IAC valve in any liquid cleaner or solvent, as damage may result.
5. Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.
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Clean the IAC valve using GM cleaner P/N 1052626 or GM X-66A. Use a shop towel or parts brush to remove heavy deposits.
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If the air passage has heavy deposits, remove the throttle body for complete cleaning.
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Shiny spots on the pintle or seat are normal and do not indicate misalignment or a bent pintle shaft.
6. Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace the O-ring if the O-ring is damaged.
INSTALLATION PROCEDURE
IMPORTANT: If installing a new IAC valve, be sure to replace the IAC valve with an identical part. The pintle shape of the IAC valve and the
diameter of the IAC valve are designed for the specific application.
