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Fast Idle Thermo Valve

  1. Disconnect air intake duct from throttle body. Start engine. Place finger over lower port on throttle body. Check for airflow with engine cold and idling. If airflow does not exist, replace fast idle valve. Fast idle valve is located near throttle body.
  2. Warm engine to full operating temperature (cooling fan comes on). Verify valve is completely closed. Valve is leaking if suction can be felt in lower port on throttle body. Replace fast idle valve if operation is not as specified.
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