Camaro RS V8-305 5.0L VIN E TBI (1990)
Knock Sensor: All Technical Service Bulletins
ECM - MIL ON/Code 43 Set/Poor Driveability
Number:
91-239-6E
Section:
6E
Date:
MARCH 1991
Corp.Bulletin No.: 136501
Subject:
LOW SPEED DRIVEABILITY AND/OR CHECK ENGINE LIGHT CODE 43
Model and Year:
1990-91 CAMARO
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 91-76-6E, DATED OCTOBER 1990. CONDITION,
CAUSE AND CORRECTION HAVE BEEN EXPANDED, AS WELL AS PART NUMBERS CHANGED. ALL COPIES OF 91-76-6E SHOULD BE
DISCARDED.
CONDITION:
Some owners of 1990 and 1991 F-cars with the 5.0L Port Fuel Injection (VIN F, LB9) V8 engine may comment about low speed
driveability or a Check Engine Light - Code 43 - Electronic Spark Control (ESC). Comments about LB9 driveability may include
idle surge, unstable idle, or stall at stops.
Some owners of 1991 F-cars with the 5.0L Throttle Body Injection (VIN E, L03) V8 engine may also comment about a Check
Engine Light - Code 43 (ESC).
CAUSE:
New calibrations have been released that refine idle speed control (LB9 only) and ESC diagnostics. A new knock sensor (LB9
Only) is also available which has improved durability characteristics.
CORRECTION:
Install knock sensor (LB9 ONLY) P/N 10456126*, and install the applicable Memcal or PROM from the table below:
Service
Scanner
Broadcast
Model
Engine
Application
P/N
I/D
Code
Year
**16163062
3061
AXXB
1991
LB9
Automatic with
Chevrolet P235/55R16
**16163066
3071
AXXC
1991
LB9
Manual (M39) with
Chevrolet P235/55R16
**16163075
3091
AXXF
1991
LB9
Automatic with
P245/50ZR16
**16163070
3081
AXXD
1991
LB9
Manual with
P245/50ZR16
**16163138
3271
AXYC
1990-91
LB9
Manual (MK6)
**16163137
3261
AXYB
1990
LB9
Manual (M39)
**16163139
3281
AXYD
1990
LB9
Automatic
*16161107
1091
AXKS
1991
L03
Automatic with
California Emissions
*16161112
1101
AXKT
1991
L03
Automatic with Federal Emissions
*16161117
1111
AXKU
1991
L03
Manual (M39) with California Emissions
*16161123
1121
AXKW
1991
L03
Manual (M39) with
Federal Emissions
*
Parts are currently available from GMSPO.