Auxiliary Air Valve (Idle Speed): Testing and Inspection

1. Remove the air intake hose to the throttle body.
2. Start the engine and note engine rpm.
3. Put your finger over the air bypass hole to the Auxiliary Air Valve.

Checking Auxiliary Air Valve Operation:

4. With coolant temperature below 176° F (80° C), the engine rpm should drop noticeably.
5. With coolant temperature above 176° F (80° C), the engine rpm should not drop more than 100 rpm, if at all.
6. If a problem is found, replace the Auxiliary Air Valve. Refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES for proper procedure.
7. Reinstall the air intake hose to the throttle body.