Corsica L4-134 2.2L (1991)
Governor: All Technical Service Bulletins
A/T - Engine Surge On Deceleration/No Upshift
Number:
91-256-7A
Section:
7A
Date:
MARCH 1991
Corp. Bulletin No.: 177109
Subject:
ENGINE SURGE ON DECELERATION, VEHICLE SPEED ERRATIC WITH CRUISE ON -
RANGE OF 1-5 MPH, NO UPSHIFT
Model and Year:
1991 CAVALIER, CORSICA, BERETTA, LUMINA
WITH 3T40 AUTOMATIC TRANSMISSION
BULLETIN COVERS:
A new governor assembly (4) which contains a high glass content driven gear. Some owners of 1991 vehicles equipped with HYDRA-MATIC 3T40
transaxles may comment on one or more of the following conditions:
-
Engine Surge on Deceleration, Surge with Cruise Control Engaged or Vehicle Speed Erratic (range of 1 to 5 MPH). These may be caused by worn
teeth (thin) on the governor driven gear.
-
No Upshift and Stuck in First Gear. These conditions are caused by an applecored governor driven gear.
SERVICE PROCEDURE:
If any of the above mentioned conditions exist, replace the entire governor assembly with a new high glass content governor, transaxle fluid strainer (33)
and seal (32) assembly. This new high glass content governor may be used on transaxles built prior to December 14, 1990 (Julian Date 348). This new
high glass content governor driven gear may cause a polished look on the governor drive gear located on the Final Drive (679) but will not affect
transaxle durability.
SERVICE PARTS INFORMATION:
Whenever ordering the new high glass content governor, refer to the following part numbers:
Description
Model
Part Number
Governor Assembly
AYC
8682985
" "
KDC
8682987
" "
KXC
8682989
" "
LYC
8682991
" "
PNC
8682993
" "
TRC
8682995
* Each governor package also contains a filter, multi-lip seal and bottom pan gasket.
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE:
Refer to the On-Vehicle Service Section of your Service Manual whenever replacement of a governor assembly is necessary.