Auxiliary Air Valve (Idle Speed): Testing and Inspection

INSPECTION
1. Remove intake air duct from throttle body, Start the engine.

Fast Idle Thermo Valve Testing:

2. With cold engine (engine coolant temperature below 30° C, 86° F). Use your finger and cover lower port in throttle body making sure there is air flow or suction with the engine cold. If there is no air flow or suction replace the Fast Idle thermo Valve and retest.
3. Warm the engine up to normal operating temperature (the cooling fan comes on).
4. Again using your finger at the lower port in the throttle body check that the Fast Idle Thermo valve is completely closed. If any air flow or suction can be felt the valve is leaking. Replace the Fast Idle Thermo Valve and retest.

NOTE: Do not attempt to disassemble the Fast Idle thermo Valve, it is factory adjusted.