A/C Signal: Adjustments

NOTE: This series of adjustments should be performed in the order given.

IGNITION TIMING

Diagnostic Connectors:

1. Warm up engine, then connect green test mode connector.
2. Connect timing light to #1 plug wire and aim at timing mark on crank pulley. Timing should be 5° BTDC.
3. If adjustment is needed, loosen distributor. Turn clockwise to advance timing and counterclockwise to retard timing.
4. Tighten distributor and disconnect test mode connector.

ENGINE IDLE SPEED

Idle Speed Adjustment (MPFI):

1. First check and adjust timing as needed.
2. Then connect black read memory connector and check idle speed. It should be 700 ± 50 rpm.

NOTE: Light, blower fan, and rear defogger switches must be OFF. Radiator fan should not be running.

3. Turn adjusting screw clockwise to lower rpm, or counterclockwise to raise rpm.
4. Disconnect test mode and read memory connectors.


A/C FAST IDLE

Idle Speed Adjustment (MPFI With A/C):

1. First check idle speed.
2. With test mode and read memory connectors still hooked up, turn A/C on and set blower switch to medium position.
3. Fast idle should be set at 800 ± 50 rpm.

NOTE: Light and rear defogger switches must both be OFF.

4. If adjustment is needed, turn adjusting screw clockwise to lower rpm or counterclockwise to raise rpm. Disconnect test mode and read memory connectors.
5. Confirm adjustment. With A/C OFF, idle speed should be 800 ± 50 rpm. With A/C ON, idle speed should be 900 ± 50 rpm.