DETONATION/ENGINE TIMING TIMING SPECIFICATIONS

Some 1983 6000 vehicles equipped with 2.8L V-6 engines may exhibit engine detonation. On vehicles not repaired to the procedure outlined in the Shop Manual, retarding the base engine timing 4 degrees is permissible. Base engine timing is now 10 degrees BTDC, recommended base timing for cars with detonation is 6 degrees BTDC. This change will alleviate the detonation problem.

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.