Idle Speed/Throttle Actuator - Electronic: Service and Repair

REMOVAL PROCEDURE

IMPORTANT: The hardware used to attach the Throttle Position (TP) sensor and Idle Air Control (IAC) valve is coated with thread-locking adhesive. If these parts are removed for service, inspect the attaching screw threads. There should be enough thread-locking material (adhesive or compound) on the threads to insure proper re-locking. If not, clean the threads and apply Loctite(R) 262, GM P/N 1052624, or equivalent, to the threads before re-assembly.




1. Remove the IAC electrical connector (1) from the IAC valve (8).




2. Remove the two IAC valve attaching screws (4) from the IAC valve (1).
3. Remove the IAC valve (1) from the throttle body.
4. Remove the IAC valve O-ring from the IAC valve.

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 pintle until the extension is less than 28 mm (1 - 1/8 in).

1. Install the new IAC O-ring.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the IAC valve (1) to the throttle body and tighten the screws (4).

Tighten
Tighten the screws to 2.3 N.m (20 lb in).




3. Connect the IAC valve electrical connector (1) to the IAC valve (8).