Ignition Timing: Adjustments

NOTE: Timing specifications are listed on the Vehicle Emissions Control Information label under the hood. Always follow the Vehicle Emissions Control Information label procedures first before using the following procedure.

Timing Mark Standard Location:

ALDL Connector (Located Underdash):

PROCEDURE
Set timing under the following conditions:
- Normal operating temperature.
- Air cleaner installed.
- A/C "OFF".
- Transmission in neutral.
- Put electronic spark timing (EST) in by pass mode. Connect a jumper lead between terminals A and B of the ALDL connector under the dash.
- Connect timing light and adjust as necessary by loosening hold down bolt and rotating distributor.
- Tighten hold down and recheck the timing.
- With ignition "OFF", clear ECM trouble code by disconnecting ECM power source.
- With engine at operating temperature, drive vehicle at part throttle with moderate acceleration and decelerate to idle condition. This will "teach" the ECM/VCM and return the engine to normal performance.