Ignition Timing: Adjustments

NOTE: Always check Vehicle Emissions Control Information label on hood when adjusting timing.

1. Set parking brake and start engine.
2. Place gear selector lever in NEUTRAL.
3. Confirm that "CHECK ENGINE" light is not on.

ALDL/DLC Connector:

4. Connect terminals on both ends of white ALDL connector with a jumper wire.
5. Connect an inductive timing light lead to No. 1 spark plug wire.

Timing Mark:

6. With timing light, check that center of fluctuation of white notched line on crank pulley against scale on timing cover, falls within standard value of:

9 - 11 BTDC

If confirmation is impossible due to large fluctuation, increase engine speed to 1500 to 2000 rpm. This should reduce fluctuation and allow confirmation.

Mounting Bolt And Electrical Connector:

7. If timing is out of standard, loosen mounting bolt on distributor and turn distributor to adjust timing.
8. Tighten distributor bolt to:

17 ft lb (24 Nm)

NOTE: When tighting bolt, be sure distributor does not turn with mounting bolt.

9. Remove jumper wire from ALDL connector.
10. Verify that "CHECK ENGINE" light does not come on.

NOTE: Idle speed adjust is not necessary. It is controlled by ECM.