S15/T15 Jimmy 4WD V6-4.3L VIN W (1996)
PROM - Programmable Read Only Memory: Customer Interest
Engine - Temporary DIP/SAG with Warm Engine
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 57-65-26
Date: January, 1996
Subject:
Temporary DIP SAG with Warm Engine (New "FLASH" Calibrations)
Models:
1996 Chevrolet and GMC Truck S/T Models
with 4.3L V6 Engine (VINs W, X - RPOs L35, LF6)
Condition
Some owners may comment on a driveability condition known as TEMPORARY dip or sag on a warm re-started engine, after approximately a one hour
soak.
The condition dip or sag is described as a lack of engine response at a particular throttle position. The engine may stumble and perform poorly.
This condition may be noticeable at a steady, light throttle operation and be noticeable for 30 seconds to a minute, after which time the condition
completely disappears.
Cause
The engine is running in a closed-loop status when the oxygen sensors are not fully operational.
Correction
