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Home >> Oldsmobile >> 2003 >> Aurora V8-4.0L VIN C >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Idle Speed/Throttle Actuator - Electronic >> Service and Repair
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Idle Speed/Throttle Actuator - Electronic: Service and Repair

IDLE AIR CONTROL (IAC) VALVE REPLACEMENT

REMOVAL PROCEDURE




1. Remove the electrical connector (1) from the idle air control valve (4).




2. Remove the idle air control valve attaching screws (2) from the idle air control valve (1).




3. Remove the idle air control valve from the throttle body.
4. Remove the idle air control valve O-ring.

INSTALLATION PROCEDURE




1. Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.

NOTE: Refer to Handling IAC Valve Notice in Service Precautions.

- 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.
- If the air passage has heavy deposits, remove the throttle body for complete cleaning.
- Shiny spots on the pintle or seat are normal and do not indicate misalignment or a bent pintle shaft.

2. Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace the O-ring if the O-ring is damaged.
3. Install the new idle air control valve O-ring.




4. Install the idle air control valve (1) into the throttle body.

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

5. Install the idle air control valve attaching screws (2) into the IAC valve.

NOTE: Refer to Fastener Notice in Service Precautions.

Tighten
Tighten the idle air control valve attaching screws to 3 N.m (27 lb in).




6. Install the electrical connector (1) into the idle air control valve (4).

7. The powertrain control module (PCM) will reset the idle air control valve whenever the ignition switch is turned ON, then OFF.
8. Turn the ignition switch ON.
9. Turn the ignition switch OFF.
10. Perform the IAC Valve learn procedure.

IAC Valve Learn Procedure
10.1. Start and idle the engine for 15 seconds.
10.2. Turn the ignition switch to the LOCK/OFF position.
10.3. Wait 15 seconds.
10.4. Restart the engine and check for proper idle operation.
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