Ignition System

The 1.8L turbocharged engines use a modified HEI system called Electronic Spark Control (ESC); 3.8L turbocharged engines use a Computer Controlled Coil Ignition (C(3)I) system incorporating the Hall Effect.

The ESC system is used to control engine detonation by automatically retarding timing during periods when detonation occurs. The 3 major components of system are ECM, ESC sensor, and HEI distributor. The ESC sensor is mounted at rear of intake manifold. It can be recognized by large diameter hex shape and single electrical connection on top. The ECM processes detonation information from ECS sensor and sends a signal to special HEI module. The ECM signal delays or advances spark timing in reference to the basic timing; therefore, setting of the base timing is critical.

The C(3)I system consists of ECM, ignition module, camshaft sensor, and connecting wires. A sealed 14-pin connector is used at the ignition module which goes straight to the ECM. Having 3 coils, the ignition system is distributor which uses a waste spark method of spark distribution. The system uses a magnetic camshaft sensor to provide a voltage signal to the ECM, when no. 1 cylinder is on the compression stroke, to properly time the fuel injection and spark.