Express 3/4 Ton Van V8-5.7L VIN R (1998)
Idle Air Control (IAC) Valve: Service and Repair
Idle Air Control (IAC) Valve Replacement
Throttle Position Sensor Electrical Connector
REMOVAL PROCEDURE
1. Remove the electrical connector from the Idle Air Control (IAC) valve
2. Remove the IAC valve attaching screws.
CAUTION: 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.
3. Remove the IAC valve assembly.
4. Remove the O-ring.
CLEANING AND INSPECTION PROCEDURE
1. Clean the IAC valve O-ring sealing surface, pintle valve seat, and air passage.
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Use the carburetor cleaner and a parts cleaning brush in order to remove carbon deposits. Follow instructions on the container.