Engine - Chuggle At 35-45 MPH

9217buick08

Bulletin:
87-6E-30

Date:
Nov. '91

Ref. No.:
87-267-6E

Corp. Ref. No.:
106504


SUBJECT:
CHUGGLE AT 35-45 MPH WITH THE TORQUE CONVERTER CLUTCH ENGAGED (REVISED CALIBRATION PROM) 1986-87 MODELS WITH 3.8L ENGINE

MODELS AFFECTED:
1986/87 CENTURY WITH 2.84 AXLE RATIO 1986/87 LESABRE WITH 2.73 AXLE RATIO 1986 PARK AVENUE WITH 2.84 AXLE RATIO 1987 PARK AVENUE WITH 2.73 AXLE RATIO

Some owners of 1986 and 1987 Century, LeSabre, and Park Avenue models equipped with 3.8L (code B and 3) engine and standard axle ratio may experience a condition of chuggle at 35-45 MPH with the torque converter clutch engaged. If the condition cannot be repaired using currently published service and diagnostic procedures, it may be necessary to install a revised calibration prom.

The proms are currently available through GMSPO under the following numbers.

PROM PROM PROM
TRANSAXLE AXLE SERVICE SCANNER BROADCAST
YEAR SERIES RATIO PART NO. I.D. NO. CODE

1986 Century F17/2.84 16158376 8394 AWWY
(Fed. & Calif.)

1986 LeSabre FP3/2.73 16158375 8404 AWWZ
(Fed. & Calif.)

1986 Electra F17/2.84 16158377 8384 AWWX
(Non T-Type (Fed. & Calif.)
models only)

1987 LeSabre/ FP3/2.73 16158373 8414 AWXA
Electra (Fed. & Calif.)

1987 Century F17/2.84 16158372 8424 AWXB
(Fed. & Calif.)

WARRANTY INFORMATION:
Use applicable labor operation and time.