Ignition Timing: Adjustments

Timing Mark:

*** UPDATED BY TSB # 18-52-89 April 10, 1989

1. Set the parking brake. Ensure automatic transmission is in PARK and manual transmission is in NEUTRAL.
2. Ensure the engine is warmed to normal operating temperature and the A/C is turned Off.
3. With the engine turned OFF, connect an ignition timing light and a tachometer.
4. Disconnect the 4-in. and 10-in. Hg. vacuum switch assembly wire connector.
5. Disconnect and plug the distributor vacuum advance hose.
6. START the engine.
7. Increase the engine speed to 1600 RPM and check the ignition timing. If necessary, adjust the timing.
Refer to SPECIFICATIONS
8. Tighten the clamp and verify that the ignition timing is correct.
9. Turn the engine OFF and remove the timing light and tachometer
10. Connect the vacuum advance hose and the 4-in and 10-in. Hg. vacuum switch wire connector.