Auxiliary Air Valve (Idle Speed): Testing and Inspection

AUXILIARY AIR VALVE

TEST





Remove left-hand air cleaner element. Remove auxiliary air valve.

Fully close idle speed adjustment screw. Immerse auxiliary air valve bulb in a container of boiling water and observe valve head through side port. Valve should move smoothly to closed position. Quickly blow through side port; no air should pass. Allow valve bulb to cool. Valve head should move smoothly back to open main air passage. If valve performance is satisfactory reset idle speed adjustment screw and refit valve.

If valve performance is not satisfactory, fit replacement component.