Lumina V6-204 3.4L DOHC (1991)
Technical Service Bulletin # 914727C
Date: 920101
M/T - Bump Sensation When Decelerating
Number:
91-472-7C
Section:
7C
Date:
JAN 1992
Corporate Bulletin No.: 136526
ASE No.: A3
Subject:
CLUTCH BUMP
Model and Year:
1991 LUMINA WITH 3.4L ENGINE AND MANUAL TRANSMISSION
Condition:
The customer may comment that the manual transmission has a "bump" sensation when decelerating. The engine may decelerate too quickly if the driver
lets up on the accelerator before depressing the clutch, causing a momentary "bump" sensation just before the clutch is fully released.
Cause:
There is no "clutch anticipate" signal to the ECM to allow for less abrupt fuel cutoff to the injectors during shifting.
Correction:
Parts List
Part No.
Name
12126540
Kit, Clutch Anticipate, contains:
(1) 4-way connector with wires
(1) Wire with terminals on both ends
(3) Crimp connectors
16166146
MEM-CAL
10180569
Switch, C/C Release and Clutch Anticipate
Parts needed if vehicle does not have cruise control:
10075405
Retaining clip
10094202
Actuator Tab
11503747
Nut
10042901
Bolt
Parts are currently available from GMSPO.
Procedures
1.
Disconnect negative battery cable.
2.
Remove the left hand IP sound insulator panel.
3.
Add a "clutch anticipate" switch as follows:
