Emission Control Systems: Adjustments

Before adjusting the idle speed, make sure: Ignition timing is correct and all electrical accessories are OFF while making actual adjustments.

1. Apply the parking brake and make sure that the vehicle is in PARK (A/T), or NEUTRAL (M/T).
2. START and idle the engine until operating temperatures have been reached.
3. Turn OFF the engine. Disable the radiator cooling fan.
4. Connect a jumper wire between the green STI single pin connector and ground.

Diagnostic Connector (STO/STI):

5. Verify the idle speed is within:

Manual Transaxle 700-800 rpm

Automatic Transaxle 700-800 rpm

6. If the idle speed is NOT within range, turn the idle air adjust screw to obtain the correct idle speed.

Idle Air Adjustment Screw:

7. After adjustments are complete, remove the jumper wire and the tachometer. Reconnect cooling fan.