Ignition Timing: Adjustments

Firing Order:

Duty Check DLC 93-94 Metro:

Checking Ignition Timing:

PROCEDURE
1. Start and run engine until normal operating temperature is attained.
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 transaxle models) or manual selector lever is in "P" (automatic transaxle models).
^ Parking brake is fully engaged.

3. Check to be sure that idle speed is within specification. Refer to Fuel Delivery and Air Induction / Specifications / Mechanical. Specifications
4. Connect a timing light to No. 1 secondary (spark plug) wire.
5. Remove cap from Duty Check Data Link Connector (DLC); located next to the left strut tower.
6. Connect a fused jumper from Duty Check DLC cavity "4" to cavity "5" so that ignition timing is fixed.

NOTICE: In this state, ignition timing is fixed.

7. Check timing. It should be 5 degrees +/- 1 degree at specified idle. Refer to underhood "Vehicle Emission Control Information Label."
8. If not within specification, loosen distributor flange bolts and rotate distributor and repeat until timing is within specifications.
9. Remove jumper from Duty Check DLC and make sure that the timing advances according to engine speed.