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IAC solenoid valves

Hitachi Idle Air Control Valve Recommended Cleaning Procedure
CAUTION: This cleaning procedure may be used with sludge tolerant bodies which are identified with a yellow/black "attention" label. No attempt should be made to clean the throttle body bore/plate area by directly spraying or scrubbing. Do not run engines with airflow meters during the cleaning procedure.

1. Plug the Rotunda Air Bypass Valve Actuator 113-00009 or equivalent into the Rotunda Fuel Injector Tester/Cleaner 113-00001 or equivalent.
2. Remove the air cleaner outlet tube (9B659) to the throttle body (9E926).
3. Disconnect the idle air control valve signal lead.
4. Attach the Rotunda Air Bypass Valve Actuator 113-00009 or equivalent plug to the idle air control valve (IAC valve) (9F715).
5. CAUTION: Do not start engines that have airflow meters. Start the actuator and then start the engine.
6. Spray Carburetor Tune-Up Cleaner D9AZ-19579-BA meeting Ford specification ESR-M14P9-A or equivalent for about five seconds into the inlet passage while the actuator is operating. Avoid direct spraying on throttle plate/bore area.
7. Stop the engine and actuator. Let everything soak for 15 minutes.
8. CAUTION: Do not start engines that have airflow meters. Start the actuator and then start the engine.
9. Spray Carburetor Tune-Up Cleaner D9AZ-19579-BA, meeting Ford specification ESR-M14P9-A or equivalent, into the idle air control valve passage leading to the inlet of the valve for up to one minute. Do not spray for longer than six continuous seconds on engines that have airflow meters and are not running.
10. Stop the actuator and stop the engine if running.
11. Reinstall the air cleaner outlet tube.
12. Start and run the engine for about one minute to dry out the solvent residue.
13. Operate the actuator to make sure the solvent is purged from the idle air control valve.
14. Disconnect the actuator from the idle air control valve.
15. Reattach the control signal lead to the idle air control valve.
16. Check the engine for normal operation.


Alternate Cleaning Procedure for Hitachi IACs
NOTE: Method to be used only when the Rotunda Fuel Injector Tester/Cleaner 113-00001 and Air Bypass Valve Actuator 113-00009 or equivalent for the recommended method are not available.

1. Remove the idle air control valve from the throttle body.
2. Remove the electrical solenoid assembly from the mechanical portion of the idle air control valve by removing the two screws, then sliding the mechanical portion away from the solenoid.
3. 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 meeting Ford specification ESR-M14P9-A or equivalent for two to three minutes maximum.
4. 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.
5. Remove the unit from the cleaning fluid and dry out thoroughly using shop air.

See also:
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