Fuel System - Possible MIL ON/Driveability Symptoms: Overview
Bulletin No.: 03-06-04-030Date: May 28, 2003
TECHNICAL
Subject:
Multiple Driveability Symptoms Due to Clogged Fuel Injectors (Clean Injectors)
Models:
2000-2003 Buick Century, LeSabre, Park Avenue, Regal
2002-2003 Buick Rendezvous
2002-2003 Cadillac Escalade, Escalade EXT
2003 Cadillac Escalade ESV
2000 Chevrolet S-10
2000-2002 Chevrolet Camaro, Lumina
2000-2003 Chevrolet Cavalier, Impala, Malibu, Monte Carlo, Silverado, Suburban, Tahoe, Venture
2001-2003 Chevrolet Express
2002-2003 Chevrolet Astro, Avalanche, Trailblazer
2003 Chevrolet Blazer, S-10, Trailblazer EXT
2000 GMC Sonoma
2000-2003 GMC Sierra, Yukon, Yukon XL
2001-2003 GMC Denali, Denali XL Savana
2002-2003 GMC Envoy, Safari
2003 GMC Envoy XL, Jimmy, Sonoma
2000-2003 Oldsmobile Alero, Silhouette
2002-2003 Oldsmobile Bravada
2000-2001 Pontiac Transport
2000-2002 Pontiac Firebird
2000-2003 Pontiac Bonneville, Grand Am, Grand Prix, Sunfire
2001-2003 Pontiac Aztek
2002-2003 Pontiac Montana
2003 HUMMER H2
with 2.2L, 3.1L, 3.4L, 3.8L, 4.2L, 4.3L, 4.8L, 5.3L, 6.0L, or 8.1L Engine (VINs F, 4, J, E, K, S, X, V, T, N, U, G - RPOs L61, LN2, LG8, LA1, L36, LL8, LU3, LR4, LM7, LQ9, LQ4, L18)
and Multec II Fuel Injectors Condition
Some owners may comment on driveability symptoms of long or hard starts, chuggle, rough idle and light or intermittent misfire. The malfunction indicator lamp (MIL) may also illuminate.
Cause
Due to various factors, the fuel injectors may become restricted. Extensive testing has demonstrated that fuel related issues are the cause of clogged injectors. At this point, no specific fuel, fuel constituent, or engine condition has been identified as causing the restriction. The restriction causes the engine to operate at a lean air fuel ratio. This may either trigger the MIL to illuminate or the engine to develop various driveability symptoms.
Parts Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles serviced under warranty, use the table.
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