Throttle Body
CAUTION:
Do not adjust the throttle stop screw. It is set at the factory and should not be tampered with.
- Start the engine and allow to reach normal operating temperature (cooling fan comes on). Disconnect the vacuum hose (to the canister) from the top of the throttle body. Connect a vacuum gauge to the throttle body. Allow the engine to idle and check that the gauge indicates no vacuum. Check that vacuum is indicated on the gauge when the throttle is slightly off idle.
- If the gauge indicates no vacuum, check the canister port. If the canister port is clogged, clean it with carburetor cleaner. Stop the engine and check that the throttle cable operates smoothly without binding or sticking.
- If there are any abnormalities, check for excessive wear or play in the throttle valve shaft, sticky or binding throttle lever at fully closed position, or clearance between throttle stop screw and throttle lever at fully closed position. Replace the throttle body if there is excessive play in the throttle valve shaft or if the shaft is binding or sticking. To clean clogged ports, use a commercially available carburetor cleaner.