Throttle body

5. Tighten the locknut. The cable deflection should now be 10 – 12 mm.

THROTTLE BODY

Inspection

CAUTION: Do not adjust the throttle stop screw. It is preset at the factory.

1. Start the engine and allow it to reach normal operating temperature (the radiator fan comes ON).

• A To vacuum pump/gauge

2. Disconnect the vacuum hose (to the EVAP control canister) from the top of the throttle body; connect a vacuum pump/gauge to the throttle body.
3. Allow the engine to idle and check that the gauge indicates no vacuum.
4. If there is vacuum, check the throttle cable.
5. Check that vacuum is indicated on the gauge when the throttle is opened slightly from idle.
6. If the gauge indicates no vacuum, check the throttle body port. If the throttle body port is clogged, clean it with carburettor cleaner.
7. Stop the engine and check that the throttle cable operates smoothly without binding or sticking.

• A Throttle lever
• B Throttle stop screw

8. If there are any abnormalities in the above steps, check for:

• Excessive wear or play in the throttle valve shaft.
• Sticky or binding throttle lever at the fully closed position.
• Clearance between throttle stop screw and throttle lever at the fully closed position. The clearance must be zero at the fully closed position.

9. Replace the throttle body if there is excessive play in the throttle valve shaft or if the shaft is binding or sticking.