Ignition Timing: Adjustments

NOTE: Check curb idle speed before proceding to the following procedures. If idle speed is not as in SPECIFICATIONS refer to COMPUTERIZED ENGINE CONTROLS for diagnosis of idle speed control system.

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.

Coolant Temperature Sensor:

3. START engine and allow to warm up to normal operating temperature.
4. Disconnect coolant temperature sensor electrical connector. The CHECK ENGINE lamp on the instrument panel should illuminate once this sensor has been disconnected. Coolant fan will come on and stay on throughout the procedure.

Distributor Hold-Down:

Timing Scale Above Crank Pulley--Viewed From Front Of Car:

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 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.
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.