KNOCKING NOISE IN ENGINE COMPARTMENT LOOSE FLYWHEEL

MODELS AFFECTED: ALL ENGINES

Loose torque converter bolts sound much like a bearing knock and will give several raps on a quick acceleration (engine running free). With the transmission in gear, the noise may or may not appear at idle depending on the idle smoothness.

Check torque converter to flywheel mounting bolts before attempting to repair any engine for bearing-type knock.

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.