Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
Memory Calibration Unit: All Technical Service Bulletins
Engine - Low Speed Chuggle
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 This will not be
published in the GMSPO catalog.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