Engine - Surge Under Moderate Acceleration

91cadillac06

Bulletin No.: T-91-103
File in Group: 6E
Number: 89
Corp. Ref. No.: 116003
Date: July, 1991


SUBJECT:
SURGE OR CHUGGLE UNDER MODERATE ACCELERATION

MODELS AFFECTED:
1988-1990 BROUGHAMS WITH 5.0L ENGINE


Some 1988-1990 Broughams with the 5.0L engine may experience a 40-50 mph surge or chuggle under moderate acceleration with the torque converter clutch engaged.

A service PROM is available through GMSPO that will address this condition. These service PROM's should only be utilized in cases where it has been determined that the condition is not caused by engine mechanical or ignition systems.

Refer to the chart below for the appropriate PROM application:

Service Service Service
Emission PROM PROM Broadcast
Model Year System P/N I.D. * Code +

1988 Cal. 16156504 6483 AWPK
1989-1990 Cal. 16156639 6493 AWPL
1988-1990 Fed. 16156673 6653 AWRD


* PROM I.D. can be read with a scan tool connected to the ALDL connector.

+ Broadcast code can be seen through the access hole on the top side of the PROM.