ENGINE DETONATION/CHUGGLE MAY NEED SERVICE PROM

MODEL AND YEAR: 1983-85 CITATION WITH 2.8L V-6 (VIN CODE X) 3 SPEED AUTOMATIC TRANSMISSION AND FEDERAL EMISSIONS 1983-86 CELEBRITY WITH 2.8L V-6 (VIN CODE X) 3 SPEED AUTOMATIC TRANSMISSION AND FEDERAL EMISSIONS TO: ALL CHEVROLET DEALERS

Some Celebrity and Citations equipped with 2.8L V6 carbureted engines may exhibit engine detonation or chuggle. If normal service procedures in the Service Manual (Section 6El, Section B) do not correct the condition, new service PROMS with revised calibrations are now available.

The model applications are:

MODEL EMISSIONS SERVICE YEAR MODELS TRANS. CALIBRATION PROM ---- ------ ------ ----------- ---- 1983 Celebrity, Citation 3 spd Auto Federal 1228323 1984 Celebrity, Citation 3 spd Auto Federal 1228325 1985 Celebrity, Citation 3 spd Auto Federal 1228326 1986 Celebrity 3 spd Auto Federal 1228326

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.