Ignition Timing: Adjustments

ADJUSTMENT CONDITIONS:

Coolant temperature at 176°F-205°F.
All accessories turned OFF.
Transmission in N (Neutral).
Parking Brake, ON.

PROCEDURE:

Tachometer Hookup:

1. Install a paper clip into the tachometer check connector.
2. Connect a tachometer to the clip.

Ignition Timing Adjustment Connector:

3. With the engine OFF, ground the ignition timing adjustment terminal with a jumper lead.
4. Start the engine and allow it to run at curb idle speed.
5. Connect a timing light to the #1 spark plug wire and check the timing.

Basic Ignition Timing

5° ±2° BTDC.


6. If necessary loosen the distributor mounting nut and adjust timing by rotating the distributor.
7. Stop the engine.
8. Disconnect the ignition timing jumper wire and RE-START the engine.
9. Recheck the timing.


Actual Ignition Timing

15° BTDC.


NOTE: Actual ignition timing may vary slightly under the direction of the MPI controller. If necessary re-check Basic Ignition Timing. If it is still correct no further action is required.