LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1996 >> Civic del Sol VTEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Idle Control System >> Fast Idle THERMO Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fast Idle THERMO Valve

  1. Remove intake air duct from throttle body. Start engine. Remove fast idle valve cover. Fast idle valve is located near throttle body. Place finger on valve seat area. Check for airflow with engine cold and idling. If airflow does not exist, replace fast idle valve.
  2. Warm engine to full operating temperature (cooling fan comes on). Verify valve is completely closed. Valve is leaking if engine speed decreases when lower port is covered and suction can be felt in valve seat area. Replace valve if valve operation is not as specified.
  3. 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.
  4. 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.
scientia non olet · About LEMON Manuals