Idle Air Control (IAC) Valve

Tools Required:

• Rotunda Air Bypass Actuator 113-00009
• Rotunda Injector Tester/Cleaner 113-00001

Recommended Cleaning Procedure

 CAUTION: Do not clean black plastic idle air control (IAC) valves. Use only specified cleaner. Do not spray directly on throttle plate or use any type of scrubbing method. Do not run engines of vehicles with airflow meters during cleaning.

1. Ensure bypass actuator is operating properly. Refer to Powertrain Control/Emissions Diagnosis Manual.

2. Remove throttle inlet air tube.

3. Disconnect idle air control (IAC) valve connector.

4. Connect Rotunda Air Bypass Actuator 113-00009 and Injector Tester/Cleaner 113-00001 or equivalent.

5. Start the actuator and then start the engine on vehicles that do not have airflow meters. Do not start engines of vehicles equipped with airflow meters.

6. Spray Carburetor Tune-Up Cleaner D9AZ-19579-BA (ESR-M14P9-A) or equivalent into idle air control (IAC) valve for five seconds while actuator is operating.

7. Turn off the actuator and stop engine. Allow solvent to soak for 15 minutes.

    CAUTION: Do not start engines on vehicles equipped with an airflow meter.

8. Turn on actuator and start engine.

9. On vehicles with airflow meters, spray carburetor cleaner into idle air control (IAC) passage for no more than six seconds. On other vehicles, spray for up to one minute.

10. Turn off actuator and stop engine if running.

11. Install intake air tube. Start actuator and engine and run engine for one minute.

12. Disconnect actuator from idle air control (IAC) valve. Connect idle air bypass valve electrical connector.

13. Start engine and check for proper operation.

Alternate Cleaning Method

Remove the idle air control (IAC) valve from the throttle body assembly. Remove the electrical solenoid assembly from the mechanical portion of the idle air control (IAC) valve by removing the two screws, then sliding the mechanical portion away from the solenoid.

 CAUTION: Do not exceed three minutes soak time, and do not use choke cleaner as an internal O-ring may begin to deteriorate.

Soak the mechanical portion in Carburetor Tune-Up Cleaner D9AZ-19579-BA (ESR-M14P9-A) or equivalent for two to three minutes maximum.

With the mechanical portion completely submerged, shake in all directions; up, down, right and left. Then push in on the rod that mates with the solenoid assembly, and again shake in all directions with the unit submerged and the rod held in as far as possible.

Remove the unit from the cleaning fluid and dry out thoroughly using shop air.