Engine - Low Speed Chuggle

91buick01

Bulletin 90-6E-23


Date Feb. '91


Ref. No. 90-217-6E


Corp. Ref. No. 076503


SUBJECT: CHUGGLE AT LOW SPEED (28-37 MPH) - NEW MEM-CAL


MODELS AFFECTED: 1989-90 SKYLARKS WITH 2.3L QUAD 4 (VIN D)


Some 1989-90 Skylarks equipped with the 2.3L Quad 4 (VIN D) engine Gmay experience a condition of a chuggle between speeds of 28 - 37 mph.


If comments about chuggle between speeds of 28 - 37 mph are received and thorough diagnosis of the engine control systems does not resolve the concern, it may be necessary to install a revised Mem-Cal calibration.


The revised Mem-Cals raise the TCC engagement speed to 37 mph and reduce the throttle position crowd release of TCC. However, vehicle fuel economy may be affected. Be sure to advise the owner of this.


NOTICE: This Mem-Cal is intended to be used on an "as needed basis". The part number will be in GMSPO but as a field fix only. This will not be published in the GMSPO catalog.

PARTS INFORMATION:

Part Scan Broadcast
Model Transaxle Emissions Number I.D. Code

1989 Auto Federal 16156388 6353 AWNB
1989 Auto California 16156393 6363 AWNC

1990 Auto Federal 16156310 5993 AWLU
1990 Auto California 16156315 6003 AWLW


Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation Number: T0500
Labor Time: 0.4 hour
Trouble Code: 92