GM Full-Size Trucks 1988-1998 Repair Information

General Information


The Distributor Ignition (DI) system consists of the distributor, hall effect switch (camshaft position sensor), ignition coil, secondary wires, spark plugs, knock sensor and the crankshaft position sensor. The system is controlled by the Vehicle Control Module (VCM). The VCM using information from various engine sensors, controls the spark timing, dwell, and the firing of the ignition coil. It is used on the 1993-98 models.