Somerset Regal L4-151 2.5L (1985)
PROM - Programmable Read Only Memory: Customer Interest
Torque Converter Clutch (TCC) - Chuggle or Surge
Bulletin 86-6E-14
Date
July, '86
Ref. No. 86-147-6E
SUBJECT:
TORQUE CONVERTER CLUTCH (TCC) "CHUGGLE" OR "SURGE
MODELS AFFECTED: 1985 & 1986 CENTURYS, SOMERSETS AND SKYLARKS EQUIPPED WITH 2.5L ENGINES (VIN CODES R & U) AND
AUTOMATIC TRANSMISSIONS
Some 1985 and 1986 Centurys, Somersets and Skylarks equipped with 2.5L engines (VIN Codes R and U) may experience a condition described as
"chuggle" or "Surge".
If this condition is encountered and cannot be repaired using currently published diagnostic and service information, it may be caused by the torque
converter clutch engaging at too low of vehicle speed. This condition will be improved by the installation of a new Service PROM, which contains
calibration changes designed to enhance vehicle cold driveability and increase TCC engagement speed to approximately 49 mph.
Refer to the chart below for proper application and Service PROM part number:
SALES
PROM
ENGINE
AXLE
OPTION
PART
APPLICATION
CODE
RATIO
CODE
NUMBER
1985 Century and Skylark
R
2.84
F17
1228020
1985 Century and Skylark
R
2.39
STD.
1227924
1985 Somerset Regal
U
2.84
Only
1228021
1986 Century
R
2.84
STD.
1228019
1986 Century
R
2.39
F62
1228018
1986 Somerset and Skylark
U
2.84
Only
1228017
Use Applicable Labor Time and Labor Operation Number.