GM Service Manual Online
For 1990-2009 cars only

LATE PRODUCTION USING ESC SPARK KNOCK AND/OR CODE 43

MODELS AFFECTED: 1983 3.8L, V-6 Engine

Late production, 1983 Regals and LeSabre models with a 3.81- V-6 engine are equipped with ESC (Electrical Spark Control). The ESC is located on top of the right wheel house panel. An inoperative ESC controller may cause engine spark knock and/or a Code 43. Early production 1983 models were not produced with ESC.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.