For 1990-2009 cars

# PEDAL BUZZ AT ZERO TO LIGHT THROTTLE IN FORWARD GEAR

#### SUBJECT: ACCELERATOR PEDAL BUZZ AT ZERO TO LIGHT THROTTLE IN FORWARD GEAR RANGES (NEW SPACER PLATE)

#### MODELS AFFECTED: 1990-91 SKYLARK WITH 2.3L ENGINE

#### BULLETIN COVERS:

A new Spacer Plate with a smaller 1-2 accumulator orifice which will reduce the potential for accelerator pedal buzz. This pedal buzz is noticeable at zero to light throttle in forward gear ranges caused by unstable operation of the 1-2 accumulator valve.

#### DATE OF PRODUCTION CHANGE:

This new Spacer Plate went into production on July 30, 1990 (Julian Date 211).

#### SERVICE PROCEDURE:

To service a Hydra-Matic 3T40 for a pedal buzz condition, replace the (existing) spacer plate with a new spacer plate which contains the smaller 1-2 accumulator orifice.

#### SERVICE PARTS INFORMATION:

Package Description Part Number and Transaxle Model

Spacer Plate 8678035 - KDC

Parts are currently available from GMSPO.

#### SERVICE MANUAL REFERENCE:

Whenever service to the Spacer Plate or valve body assembly is necessary, refer to the Hydra-Matic 3T40 Unit Repair Section of your service manual.

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.