Ignition Timing: Adjustments

NEW FOR 1991:
On Canadian models, the head lights, tail lights remain lit even after the headlight switch has been turned off. This is caused by the Daytime Running Light circuit, and does not indicate a problem.

Before checking or adjusting ignition timing, be sure:
Engine coolant is at operating temperature, 80-95°C (176 - 205°F)
Lights, electrical accessories, and cooling fan are OFF
Transmission is in Park or Neutral
Front wheels are pointing straight ahead
Parking brake is set

1. Connect a timing light to the number one cylinder according to manufacturers instructions.

Tachometer Connection Using A Paper Clip:

2. Connect a tachometer. If using a primary current pulse detection type tachometer, insert a paper clip at the wire side of the connector, then connect the tachometer to the paper clip.
DO NOT disconnect the electrical connector.

3. Start and run the engine at idle. Verify idle speed is at CURB Idle.
Refer to MECHANICAL SPECIFICATIONS.

NOTE: The tachometer will indicate 1/3 of the engine speed. For the actual engine rpm, multiply the tachometer reading by 3.

Ignition Timing Adjustment Terminal Grounded:

4. With the engine stopped, disconnect the ignition timing adjustment terminal, located in the engine compartment. Ground the terminal using a lead wire with alligator clips.

NEW FOR 1991:
When the ignition timing adjustment terminal is grounded the Malfunction Indicator light will come on and a Code 36 will be stored in the MPI Control Units memory.

5. Restart the engine.

Timing Mark:

6. Aim the timing light at the crankshaft pulley and check BASIC ignition timing.
Refer to ELECTRICAL SPECIFICATIONS.

Crank Angle Sensor (Left-Center On Engine):

7. If timing is not within specification, loosen the crank angle sensor mounting nut and adjust by turning the sensors housing, then tighten the nut being careful that the crank angle sensor does not move. Recheck ignition timing.

8. After adjustment, stop the engine, disconnect the lead wire from the ignition timing adjustment terminal and remove the tachometer and the paper clip.

9. Start and run the engine at idle.

10. Recheck ignition timing to ensure that it advances from BASIC to ACTUAL timing.
Refer to ELECTRICAL SPECIFICATIONS.

11. Remove the timing light.

NOTE: (a) Actual ignition timing may vary, depending on the control mode of the MPI Control Unit.

(B) At altitudes more than 700 meters (2,300 feet) above sea level, the MPI Control Unit may further advance the actual ignition timing.