Ignition Timing: Adjustments

1. Precondition the engine as follows:
a. Engine coolant temperature greater than 185° F.
b. Lights, electric cooling fan, and all electrical accessories "OFF".
c. Transmission in "NEUTRAL" or "PARK".
d. Steering wheel in the neutral position.
2. Connect a timing light.

Tachometer Lead Connector Location:

3. Insert a paper clip into the idle speed connector (blue).

Tachometer Installed:

4. Connect a tachometer to the inserted clip.

NOTE: The tachometer should read at 1/3 of the actual engine speed. Multiply the reading by 3 to obtain the correct RPM.

Ignition Timing Adjustment Terminal Location:

5. With the ignition "OFF", remove the waterproof plug from the connector (brown) for ignition timing adjustment and ground the terminal using a jumper wire.
6. Start the engine and allow it to run at curb idle speed.
7. Verify that Curb Idle Speed = 700 ± 100 RPM.

Ignition Timing Inspection:

8. Verify that Basic Ignition Timing = 5 ± 2 degrees BTDC.
9. If timing is not within specification, check the operation of the Crankshaft Position Sensor and ignition control components.

Crankshaft Position Sensor
Ignition Control Module


10. Stop the engine and disconnect the grounding jumper.