Ignition Timing: Adjustments

***UPDATED BY TSB # 91-16-001, FEBRUARY 1991.


1. Precondition the engine as follows:
a. Engine coolant temperature greater than 185 degrees F.
b. Lights, electric cooling fan, and all electrical accessories off.
c. Transaxle in neutral or park.
d. Steering wheel in the neutral position.
e. Ignition timing verified correct.
2. Connect a timing light.

Connecting Tachometer:

3. Insert a paper clip into the CRC filter connector and connect a tachometer to the inserted clip.
4. Verify curb idle speed.

Curb Idle Speed:
750 +/- 100 rpm

Ignition Timing Adjustment Connector:

NOTE: MAKE SURE THE MITSUBISHI MULTI-USE TESTER OR GROUND WIRE HAS BEEN DISCONNECTED FROM THE DIAGNOSTIC CONNECTOR.
5. With the engine off ground the ignition timing adjustment terminal with a jumper lead.
6. Start the engine and allow it to run at curb idle speed.

Measuring Ignition Timing:

7. Verify basic ignition timing.

Basic Ignition Timing:
5 degrees BTDC

Adjusting Ignition Timing:

8. If necessary loosen the distributor mounting nut and adjust timing by rotating the crank angle sensor.
9. Stop the engine and disconnect the grounding jumper.
10. Start the engine and allow it to operate at curb idle speed.
11. Verify actual ignition timing. (Actual ignition timing may vary slightly under the direction of the ECU. If necessary re-check Basic Ignition Timing. If it is still correct no further action is required.

Actual Ignition Timing:
8 degrees BTDC