K Tahoe 4WD V8-4.8L VIN V (2000)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
PCM - Lean Hesitation/Sag/Stumble
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 00-06-03-009A
Date: March, 2001
TECHNICAL
Subject:
Lean Hesitation, Sag or Stumble When Coolant Temperature is
Between -6 and +20°C (Reprogram PCM)
Models:
2000 Chevrolet and GMC C/K Models
(Silverado, Sierra, Suburban, Tahoe, Yukon, Yukon XL)
with 4.8 L, 5.3 L, or 6.0 L V8 Engine (VINS V, T, U - RPOs LR4, LM7, LQ4) and 4L60-E Automatic Transmission (RPO M30)
This bulletin is being revised to add 6.0L (RPO L04) V8 Engine applications. Please discard Corporate Bulletin Number 00-06-03-009 (Section 06 -
Engine).
Condition
Some customers may comment on a lean hesitation, sag or stumble condition present during light to moderate throttle accelerations.
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The condition is usually present only on the first one or two accelerations.
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The condition occurs when the coolant temperature is between -6 and +21°C (20 and 70°F).
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Fuels with a high driveability index can also be a contributor.
Cause
Calibrations not optimized for various operating parameters.
Correction
Verify that the driveability condition is not the result of an inoperative component, or a related wiring/other condition.
Calibration Information
The Calibrations listed are electronic calibrations and are NOT available from GMSPO. Calibrations will be available from Techline starting December
2000, on the TIS 2000 version TIS 19.5/2001 data update or later.
