Auxiliary Air Valve (Idle Speed): Testing and Inspection

Fast Idle Valve Inspection

NOTE: The fast idle valve is factory adjusted; it should not be disassembled.

1. Start the engine.
2. Remove the cover of the fast idle valve.





3. Put your finger on the valve seat area and make sure that there is air flow with the engine cold (coolant temperature below 30°C, 86°F) and idling.





- If not, replace the fast idle valve and re-test.
4. Warm up the engine (cooling fan comes on).
5. Check that the valve is completely closed.
- If not, an air suction sound can be heard in the valve seat area.
- If any suction is heard, the valve is leaking. Replace the fast idle valve and re-check.