Ignition Timing: Adjustments

IGNITION TIMING ADJUSTMENT
1. Start and warm engine to normal operating temperature.
2. Stop engine, but keep ignition switch in the "ON," position for 5 seconds and then start engine again.
3. Run engine at 2,000 RPM for 5 minutes so that it is fully warmed and then keep it running at idle speed.
4. Make sure that:
^ All electrical loads (wipers, radio, headlights, defogger and blower) are switched "OFF."
^ A/C is "OFF," if equipped.
^ Gearshift control lever is set in neutral (manual transmission) or manual selector lever is in "P" (automatic transmission).
^ Parking brake lever is engaged fully.

Idle Speed Settings:

5. Check to be sure that idle speed is within specification. Refer to the accompanying image for specifications.

Checking Ignition Timing:

6. Connect a timing light to the number 1 high tension spark plug wire.
7. Remove cap from Duty Check Data Link Connector (DLC) located next to the battery.

Duty Check DLC Pinout:

8. Connect a jumper from Duty Check DLC cavity "4" to cavity "5" as shown in accompanying image.

NOTICE: In this state, ignition timing is fixed.

9. Check timing, should be 5° +/- 1° BTDC at 800 RPM.

Adjusting Ignition Timing:

10. If not within specification, loosen distributor hold down bolt and rotate distributor and repeat until timing is within specifications.
11. Remove jumper from Duty Check DLC. Make sure that timing advances with engine speed.