MOTORCRAFT DURA-Spark II Electronic Ignition System: Operation: Notes

The Dura-Spark II system contains a distributor, electronic control module and ignition coil. See Figure. An armature (reluctor) with 4 teeth (one for each cylinder) rotates with the distributor shaft past a stator (pick-up coil). As the teeth pass the pick-up coil, a signal is sent to the electronic control module.

The module then determines when to turn current off and on in the primary windings of the ignition coil. This current collapse in the primary causes a high voltage surge in the secondary, firing the spark plugs. System components include the following: