Ignition Timing: Adjustments

PROCEDURE
1. Start and warm engine to normal operating temperature.
2. Make sure that:
^ All electrical loads (wipers, radio, headlights, defogger and blower) are "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 fully engaged.

3. Check to be sure that the idle speed is within specification. Refer to Idle Speed / Specifications / Mechanical.

Comp. Loc:

4. Connect a timing light to No. 1 cylinder high tension cord.
5. Remove cap from Duty Check Data Link Connector located next to the battery.

Comp. Loc:

6. Connect a jumper wire from Duty Check Data Link Connector cavity "4" to cavity "5."

NOTE: In this state, ignition timing is fixed.

Comp. Loc:

7. Check timing. It should be 5° + or - 1° BTDC at 800 RPM.

Comp. Loc:

8. If not within specification, loosen distributor hold down bolt and rotate distributor and repeat until timing is within specifications.
9. Remove jumper from Duty Check Data Link Connector. Make sure that timing is within specifications and that it advances with engine speed.