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Base (Initial) Ignition timing is NOT adjustable on any engine. On this engines, do not attempt to adjust ignition timing by rotating the distributor.All ignition timing functions are controlled by the Powertrain Control Module (PCM). The DRB scan tool may be used to verify base timing and electronic timing advance. Refer to the appropriate Powertrain Diagnostics procedures for operation of the DRB Scan Tool.Fuel synchronization can be verified and set by rotating the distributor.
CHECKING DISTRIBUTOR POSITION To verify correct distributor rotational position, the DRB scan tool must be used.WARNING: WHEN PERFORMING THE FOLLOWING TEST, THE ENGINE WILL BE RUNNING. BE CAREFUL NOT TO STAND IN LINE WITH THE FAN BLADES OR FAN BELT. DO NOT WEAR LOOSE CLOTHING.
The degree scale on SET SYNC screen of DRB is referring to fuel synchronization only. It is not referring to ignition timing. Because of this, do not attempt to adjust ignition timing using this method. Rotating distributor will have no effect on ignition timing. All ignition timing values are controlled by powertrain control module (PCM).