Ignition System - Electronic: Description

The electronic ignition system consists of a magnetic pick-up coil, pole piece and electronic module inside the distributor. The ignition coil is externally mounted.

The spark advance curve is totally controlled by the Electronic Spark Timing (EST) circuitry of the Electronic Control Module (ECM). No vacuum or centrifugal advance mechanisms are used in this system. The ECM monitors crankshaft position, engine RPM, engine load, engine detonation, engine temperature and transmission gear position. The ECM uses this data to compute the desired spark advance. The Electronic Spark Control (ESC) circuitry of the ECM will retard ignition timing when it senses engine detonation.