Express 2500 V6-4.3L VIN X (2005)
Idle Speed/Throttle Actuator - Electronic: Service and Repair
IDLE AIR CONTROL (IAC) VALVE REPLACEMENT
REMOVAL PROCEDURE
1. Turn OFF the ignition.
2. Remove the engine cover.
3. Disconnect the harness connector from the idle air control (IAC) valve.
4. Remove the IAC valve attaching fasteners.
5. Remove the IAC valve assembly.
NOTE: If the IAC valve has been in service: DO NOT push or pull on the IAC valve pintle. The force required to move the pintle may damage the
threads on the worm drive. Also, DO NOT soak the IAC valve in any liquid cleaner or solvent, as damage may result.
6. Remove the O-ring.
CLEANING AND INSPECTION PROCEDURE
1. Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.
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Use a carburetor cleaner and a parts cleaning brush in order to remove any carbon deposits. Follow the instructions on the container.
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Do not use a cleaner that contains methyl ethyl ketone (MEK). MEK is an extremely strong solvent and not necessary for this type of deposit.
