K 1500 Truck 4WD V8-4.8L VIN V (1999)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
PCM - Lean Hesitation/Sag/Stumble on Acceleration
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 01-06-04-006
Date: February, 2001
TECHNICAL
Subject:
Lean Hesitation, Sag or Stumble On Light/Moderate Acceleration
(Reprogram PCM)
Models:
1999 Chevrolet and GMC C/K Pickup Models (Silverado, Sierra)
with 4.8 L, 5.3 L or 6.0 L V8 Engine (VINS V, T, U - RPOs LR4, LM7, LQ4)
Condition
Some customers may comment on the following condition:
A lean hesitation, sag or stumble present during light to moderate accelerations.
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Usually only present on the first one or two accelerations.
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The condition occurs when the coolant temperature is between -6°C and +21 °C (20°F and 70°F).
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Fuels with a high drivability index can also be a contributor.
Calibration Information
The Calibrations shown are electronic calibrations and are NOT available from GMSPO. Calibrations will be available from Techline starting November
2000, on the TIS 2000 version 19.5 TIS 00/2000 data update or later.
Cause
Calibrations not optimized for various operating parameters.
Correction
Verify that the drivability condition is not the result of an inoperative component, or a related wiring/other condition.
Warranty Information
For vehicles repaired under warranty use table as shown.
