Throttle Body: Testing and Inspection

THROTTLE BODY INSPECTION

1. Clean Throttle Body Before Inspection

a. Wash and clean the cast parts with a soft brush and carburetor cleaner.






b. Using compressed air, blow all passages and apertures in the throttle body.

NOTE: To prevent deterioration, do not clean the throttle position sensor and dash pot or throttle opener.

2. Inspect Throttle Valve

a. California only: Apply vacuum to the throttle opener.






b. Check that there is no clearance between the throttle stop screw and throttle lever when the throttle valve is fully closed.







3. Inspect Throttle Body






a. Check that the throttle linkage moves smoothly.






b. Check the vacuum at each port.

^ Start the engine.

^ Check the vacuum with your finger.

Port name At idling Other than idling

P No vacuum Vacuum

*E No vacuum Vacuum

*R No vacuum No vacuum

*California only