For 1990-2009 cars

# ENGINE DETONATION LIGHT THROT 1980-81 3.8L & 4.IL V6

1980-81 3.8L AND 4.1L V-6 ENGINES-DETONATION ON LIGHT THROTTLE ENGINE DETONATION ON LIGHT THROTTLE ON V-6 ENGINES MAY BE CAUSED BY THE EST HARNESS BEING ROUTED TOO CLOSE TO A SPARK PLUG WIRE. THE DETONATION CONDITION CAN BE CORRECTED BY MAKING SURE THERE IS AT LEAST 1" OF CLEARANCE BETWEEN THE EST HARNESS AND THE PLUG WIRES.

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.