Ignition System: Description and Operation

Ignition System Wiring Diagram:

The High Energy Ignition (HEI) system consists of the ignition coil, ignition module, distributor assembly (cap, rotor, magnetic pick-up, distributor shaft etc..), secondary wires, spark plugs, and the Electronic Spark Timing (EST) portion of the ECM. This system controls fuel combustion by providing a spark to ignite the compressed air/fuel mixture at the correct time. To provide improved engine performance, fuel economy, and control of exhaust emissions, the ECM controls distributor spark advance (timing) with the Electronic Spark Timing (EST) system.