SPARK PLUG FOULING SPARK PLUG RECOMMENDATIONS

MODEL AND YEAR: 1987 PASSENGER CARS EQUIPPED WITH 4.3L V-6 (VIN CODE Z), 5.0L V-8 (VIN CODE H OR G) AND 5.7L V-8 (VIN CODE 6)

TO: ALL CHEVROLET DEALERS

Incidents of spark plug fouling on early 1987 passenger vehicles equipped with 90 degree V6 and V8 engines and R43TS,spark plugs can be corrected by the installation of a higher heat range spark plug. The new plug is a type R45TS equipped with a copper core, P/N 5613957.

A copper core spark plug can be identified by a "dot" after the "AC" logo on the porcelain portion of the plug. (Example: AC.R45TS). Every effort should be made to insure that the plugs to be installed are copper core type.

The following carline/engine combinations are affected:

CARLINE ENGINE

Caprice/Monte Carlo LB4 4.3L EFI LG4 5.OL Carb. L69 5.OL Carb. LM1 5.7L Carb.

Camaro LG4 5.OL Carb.

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.