Removal and Installation

Removal Procedure

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.




1. Disconnect the negative battery cable.




2. Disconnect the IAT sensor harness connector.




3. Disconnect the breather tube from the air cleaner outlet duct.




4. Remove the wing nut retaining the air cleaner outlet duct.
5. Loosen the clamp on the outlet of the MAF sensor.




6. Lift the air cleaner outlet duct from the throttle body and remove the assembly from the MAF sensor.




7. Disconnect the IAC valve harness connector.




8. Remove the IAC valve mounting screws.
9. Remove the IAC valve and O-ring from the throttle body assembly.




Installation Procedure

NOTE: The IAC valve may be damaged if installed with the cone (pintle) extended more than 28 mm (1 - 1/8 in). Measure the distance that the valve is extended before installing a new valve. The distance from the idle air control valve motor housing to the end of the idle air control valve pintle should be less than 28 mm (1 - 1/8 in). Manually compressing the pin tie until the extension is less than 28 mm (1 - 1/8 in).

Important: Use an identical part when installing a new idle air control (IAC) valve. The IAC valve pintle shape and dimensions are
designed for specific applications.




1. On a new IAC valve, measure the distance between the IAC valve pintle and mounting flange. Use finger pressure to slowly retract the pintle if the distance is more than 28 mm (1 - 1/8 in).
2. Lubricate the IAC valve O-ring with clean engine oil.
3. Align the flange holes with the mounting holes on the throttle body assembly.




4. Insert the IAC valve through the O-ring into the throttle body assembly.

NOTE: Refer to Fastener Note in Service Precautions.

Important: The screws used to attach the IAC valve are coated with thread locking adhesive. Clean the attaching screw threads and apply thread locking material GM P/N 1052624 or equivalent.




5. Install the IAC valve mounting screws.

Tighten: Tighten the screws to 3 N.m (27 lb in).




6. Connect the IAC valve harness connector.




7. Install the air cleaner outlet duct.
8. Tighten the air cleaner outlet duct wing nut.




9. Secure the air cleaner outlet duct to the MAF sensor.

Tighten: Tighten the air cleaner outlet duct clamp to 4 N.m (35 lb in).




10. Connect the breather tube to the air cleaner outlet duct.
11. Connect the IAT sensor connector.
12. Connect the negative battery cable.
13. Reset the IAC valve pintle position.