K 1500 Truck 4WD V6-262 4.3L VIN Z (1993)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
PROM - Backfire/Hesitation, Low Power/Surge In High Gear
Group Ref.: Engine Fuel & Emission
Bulletin No.: 376516
Date: January, 1994
SUBJECT:
BACKFIRE/HESITATION (SAG) ON LAUNCH, LOW POWER (SURGE) IN HIGH GEAR
MODELS:
1993 CHEVROLET AND GMC C/K TRUCKS WITH 4.3L ENGINE (VIN Z - RPO LB4) AND MANUAL TRANSMISSION
CONDITION:
Some owners may comment on one or more of the following conditions.
1.
Backfire on initial acceleration from a standing start and/or backfire when accelerating at low speeds in high gear.
2.
Hesitation or sag on initial acceleration from a standing start.
3.
Low power or perceived engine surge when accelerating at part throttle in high gear and/or low power at part throttle when climbing hills in high
gear.
CAUSE:
System/component variability.
CORRECTION:
Install the correct service PROM from the table.
PROM Information: All PROMs are NA1 (less than 8500 GVW)
Parts are currently available from GMSPO.
LABOR TIME:
Labor Operation: T0500 - PROM, PCM-Replace
Labor Time: 0.6 hour
