Emission Control Systems: Adjustments

Idle Air Adjustment Screw:

1. Warm engine to operating temperature. Connect tachometer.

STI And STO Connectors:

2. Turn engine and all accessories OFF. Ground PCM Self-Test Input (STI) connector.
3. Start engine check idle speed. If not within specification, correct with idle speed adjustment screw.

IDLE SPEED: 700 - 800 rpm

4. Turn engine OFF, remove STI ground, and let engine cool.
5. Start cold engine; idle speed should be higher than when warm.