Throttle Body: Adjustments

THROTTLE BODY ADJUSTMENT





Checking Adjustment
^ Warm up the engine.
^ Connect an accurate tachometer.
^ Engine IDLING.
^ Gear selector in the P position.
^ A/C OFF.
^ Pinch the Idle Air Control (IAC) Valve hose with a hose clip.

Engine speed should be below 500 rpm.
It is not a fault if the engine stops.

If this value is OK:
- Remove the hose clip.
- Return to fault tracing where it was interrupted.
If the reading is incorrect:
- Adjust idle speed.





Adjusting Idle Speed
^ Loosen the throttle spindle adjustment screw lock nut.
^ If not running, START engine.
^ Turn the adjustment screw until idle speed is 480 - 520 rpm.
^ Switch OFF the engine.
^ Tighten the lock nut. Hold the adjustment screw so that it does not turn.
^ Continue with Checking.