S15/T15 4WD P/U V6-262 4.3L (1988)
PROM - Programmable Read Only Memory: Customer Interest
Engine Controls - Increased Performance
GMC NUMBER:
88-T-113
GROUP:
6E - Engine Emissions
DATE:
May, 1988
CORPORATE
NUMBER:
836515
SUBJECT:
INCREASED PERFORMANCE
MODELS:
1988 S/T TRUCKS WITH 4.3L (VIN CODE Z) ENGINE AND CALIFORNIA EMISSIONS
Customer comments of lack of performance, poor tip-in response, or engine flatness may be received in connection with some early built S/T trucks with
a 4.3L engine and California emissions. A new PROM was put into production that addresses these conditions. This new PROM is now available for
trucks built before the following breakpoints:
GMC
-
523895
The new PROM part number for the LB4 (4.3L) engine is listed below:
New
New
Broadcast
PROM
Emiss.
New PROM
Code
I.D.
Type
Trans.
Axle
Kit #
PROM Label
Scan Tool
Calif
Auto (MD8)
GU4 (3.08)
16124986
ANKB
5551
(NB2)
GU6 (3.42)
For PROM replacement on vehicles under warranty use:
Labor Op:
T7590 Labor Time: .8 Hrs.
