For 1990-2009 cars

# TIMING CHAIN DAMPNER REQUIREMENT INFORMATION

THE "STATIONARY" TIMING CHAIN DAMPNER WHICH WAS DISCONTINUED IN PRODUCTION IN 1981, ON THE ABOVE ENGINES, IS NO LONGER REQUIRED ON ANY ENGINE WITH THE ABOVE VIN CODES. THE DAMPNER IS, HOWEVER, STILL REQUIRED ON ENGINES WITH VIN CODE C (1977 AND PRIOR YEARS).

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.