Idle Speed: Adjustments

***FOR UPDATED INFORMATION NOT INCLUDED HERE, REFER TO TSB #P93/19-001, DATED JUNE 17, 1993***

NOTE: Base idle speed is set at factory. It should not require further adjustment unless plenum chamber is changed. The adjustment screw is sealed with a plug to prevent unauthorized alteration. Check Ignition Timing before attempting following procedure, since this will affect idle speed.

Idle Screw:

ADJUSTING BASE IDLE SPEED
1. Drill tamper proof plug and insert a self tapping screw to enable plug to be extracted.
2. Start engine, adjust idle screw clockwise to decrease or counter-clockwise to increase idle speed.
3. Stop engine, remove blanking hoses. Reconnect hose to plenum.
4. Fit new tamper proof plug.
5. Check fault code display, and clear the ECM memory.