For 1990-2009 cars

# SHUDDER/VIBRATION ON ACCEL. (INSTALL NEW CRANK PULLEY)

#### SUBJECT: SHUDDER AND/OR VIBRATION ON ACCELERATION FROM A STANDING START (INSTALL NEW CRANKSHAFT PULLEY)

#### MODELS/YEARS: 1992 ACHIEVA WITH 3300 (VIN N) ENGINE

#### CONDITION:

---------- Some early production 1992 Achieva's with 3300 (VIN N) engine may exhibit a shudder and/or vibration from a standing start.

#### CORRECTION:

----------- This condition may be corrected by changing the engine balance characteristic with the installation of a new crankshaft pulley, P/N 24501985 which is currently available from GMSPO. This new pulley was introduced into production on November 12, 1991 beginning with vehicle number NM400215.

The new crankshaft pulley can significantly reduce shudder and vibration on acceleration from a standing start.

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.