Corsica V6-191 3.1L (1990)
Valve Body: Customer Interest
Pedals - Buzz At Light Throttle
Number: 91-225-7A
Section: 7A
Date: March 1991
Corporate Bulletin No.: 077126R
Subject:
PEDAL BUZZ AT ZERO TO LIGHT THROTTLE IN FORWARD GEAR RANGES
Model and Year:
1990-91 CAVALIER, CORSICA, BERETTA WITH 3.1L ENGINE AND 3T40 AUTOMATIC TRANSMISSION
THIS BULLETIN CANCELS AND SUPERCEDES DEALER SERVICE BULLETIN NO. 91-61-7A. SERIAL NUMBER INFORMATION UNDER
SECTION "DATE OF PRODUCTION CHANGE" HAS BEEN INCLUDED AND PART NUMBERS UPDATED. ALL COPIES OF 91- 61-7A
SHOULD BE DISCARDED.
BULLETIN COVERS:
A new Spacer Plate (20) with a smaller 1-2 accumulator orifice which will reduce the potential for 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 in all "K" and "L" model HYDRA-MATIC 3T40 transaxles for the 1991 model year on July 30, 1990
(Julian Date 211).
NOTE: 1991 KKC model transaxles with serial numbers built between 1011 - 1830 and built after July 30, 1990 (Julian Date 211) are also affected.
SERVICE PROCEDURE:
To service any 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:
Refer to the following part numbers whenever ordering this new spacer plate.
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.
