Ignition Timing: Testing and Inspection

NOTE:
- Base (initial) ignition timing is NOT adjustable on any 2.5L 4-cylinder or 4.0L 6-cylinder engine. Do not attempt to adjust ignition timing by rotating the distributor.
- Do not attempt to modity the distributor housing to get distributor rotation. Distributor position will have no effect on ignition timing.

All ignition timing functions are controlled by the Powertrain control module (PCM). For additional information, refer to the Powertrain Management/Computer and Control Systems/appropriate Powertrain Diagnostics Procedures service for operation of the DRB Scan Tool.