ENGINE VIBRATION/IDLE SHAKE 40 DEGREES F AND BELOW INFO

A cold weather related engine vibration/idle shake may be the result of the front engine mounts. The condition may disappear after the vehicle has warmed at moderately cold temperatures (25-40 DEG F) but at very cold temperatures may never disappear.

This condition may be corrected by replacing both front engine mounts. Part numbers 10029901 (right side) and 10029902 (left side).

1983 vehicles built after the following VIN breakpoints are not affected:

Norwood 134004

Van Nuys 118973

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.