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





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 retest.
4. Warm up the engine (cooling fan comes on).
5. Check that the valve is completely closed. If not, air suction can be felt in the valve seat area.
- If any suction is felt, the valve is leaking. Replace the fast idle valve and recheck.