Fifth Avenue V8-318 5.2L VIN R 4-bbl (1986)
Powertrain Control Module: Customer Interest
ECM/Converter Clutch - Warm Surge Between 35-55 Mph
Models
1986-1988 "M" Body Equipped With 5.2 2BBL Engine
Subject
Warm Surge Between 35-55 MPH
Index
DRIVEABILITY
Date
November 9, 1987
No..
18-11-87 REVISION A
P-4072
This bulletin supersedes Technical Service Bulletin 18-11-87, which should be removed from your files.
This repair only applies to subject vehicles equipped with a Federal Emission Package. It does not apply to 5.2L 2BBL heavy duty engines (identified by
a "4" in the eighth [engine] character of the VIN), or 1988 "E" Price Class vehicles (identified with a "1" in the sixth (price class) character of the VIN.
SYMPTOM/CONDITION
Vehicle may exhibit a surge between steady speeds of 35 and 55 mph, with engine at full operating temperature.
DIAGNOSIS
Road test the vehicle at a steady speed between 35 and 55 mph to verify surge condition. Engine must be at full operating temperature. The surge
normally is worse just after transmission lock-up engagement.
PARTS REQUIRED
Drive Package PN 4419440
Consists of:
1
ESA/EFC Module
PN 4379255
1
6.2# Transmission Lock-Up Spring
PN 4202672
1
Transmission Pan Gasket
PN 4295875
1
Authorized Modification Label
PN 4275086
REPAIR PROCEDURE
This repair involves replacement of the transmission lock-up spring and a revised ESA/EFC module. The lock-up speed will be raised from
approximately 43 mph to 53 mph.
