Ignition Timing: Adjustments

The ignition timing marks are located on the engine front cover. A saw slot on the balancer indicates No. 1 piston position.

PROCEDURE:

1. With the engine running at normal operating temperature, turn OFF all accessories and disconnect the EST By-Pass connector located at the harness "Y" near the firewall.
^ An ECM code will be set when the EST By-Pass connector is disconnected.
2. Use a timing light and tachometer to set the timing at the specified RPM by loosening the distributor clamp bolt and rotating the distributor until the specified timing is obtained.
^ Base Timing 10° BTDC at 675 RPM
3. Tighten the distributor clamp bolt and recheck the timing to make sure the distributor was not moved when the clamp was tightened.
4. Turn the engine OFF and connect the EST By-Pass connector.
5. Clear the ECM Code by disconnecting the negative battery cable for at least 30 seconds.