DELCO-REMY Electronic Spark Timing Ignition System: Description

Electronic Spark Timing is used on California Buick, Chevrolet, Oldsmobile and Pontiac models with the 3.8L VIN A V6 engines (also Oldsmobile 4.3L V8 VIN F) that use the C4 emission system. It is also used on Federal Cadillac (Eldorado & Seville) models with the 6.0L V8 that uses the Digital Electronic Fuel Injection system. System consists of a modified HEI distributor (no vacuum or mechanical advance), a seven pin module in distributor, and a Electronic Control Module (ECM). Ignition timing is determined by the ECM which receives signals from the special 7 pin HEI module and various other engine sensors.