Ignition Timing: Adjustments

NOTE: Check curb idle speed and adjust if necessary before proceding to the following procedures.

1. Place transmission in neutral and turn OFF all lights and accessories.
2. Connect timing light to number 1 cylinder. Refer to timing light manufacturer's instructions for proper connecting procedures.
3. START engine and allow to warm up to normal operating temperature.

Coolant Temperature Sensor:

4. Disconnect coolant temperature sensor electrical connector. The CHECK ENGINE lamp on the instrument panel should illuminate once this sensor has been disconnected.

Distributor Hold-Down:

Timing Scale and Magnetic Timing Probe Receptacle:

5. Check timing by pointing timing light at the front crankshaft pulley. If timing is within 2° of specifications do not adjust. If timing is incorrect, loosen distributor hold-down bolt and rotate distributor housing until correct timing specification is obtained. Refer to Powertrain Management/Ignition System/Specifications.
6. Tighten distributor hold-down bolt, and recheck timing. Reconnect coolant temperature sensor electrical connector, and erase any fault codes that may have been set. For clearing fault codes refer to COMPUTERIZED ENGINE CONTROLS.
7. Recheck idle RPM.
NOTE: There is an additional socket next to the timing scale, it is a socket for a magnetic timing probe. Do not set the timing through this socket with a standard timing light. This socket is positioned 10 degrees ATDC and will yield inaccurate timing specifications if used with a standard timing light.