Integrated Electronic Ignition System: Notes
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Ignition timing is controlled by the Powertrain Control Module (PCM) and is not adjustable. DO NOT attempt to check base timing as false readings will result.