File In Section: 06 - Engine/Propulsion System
Bulletin No.: 99-06-04-005B
Date: September, 2001
Driveability Symptoms Due to Clogged Fuel Injectors
1994-1996 Buick Regal
1994-1999 Buick Century
1994-1998 Buick Skylark
1994-1996 Chevrolet Corsica, Beretta
1995-1999 Chevrolet Lumina, Monte Carlo
1996 Lumina APV
1997-1999 Chevrolet Malibu, Venture
1994-1996 Oldsmobile Cutlass Ciera
1994-1997 Oldsmobile Achieva, Cutlass Supreme
1996-1999 Oldsmobile Silhouette
1997-1998 Oldsmobile Cutlass
1999 Oldsmobile Alero
1994-1999 Pontiac Grand Am, Grand Prix
1996-1998 Pontiac Trans Sport
1999 Pontiac Montana
with 3.1 L or 3.4 L V6 Engine (VINs E, J, M - RPOs LA1, LG8, L82)
This bulletin is being revised to update labor time allowance for labor operation J5645.
Please discard Corporate Bulletin Number 99-06-04-005A (Section 6 - Engine).
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.
Due to various factors, the fuel injectors may become restricted. 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.
Fuel injector restrictions, deposits, can be cleaned on the vehicle, using the following procedure. Under NO circumstances should this procedure be modified, changed or shortened.
|^||The recommended mixture amount of GM Top-Engine Cleaner has been increased from 5% to 10%. This increase was implemented to improve the effectiveness of the injector cleaning procedure. Follow the cleaning procedure carefully to minimize the risk of fuel system damage. |
|^||GM Top-Engine Cleaner is the only injector cleaning agent approved for use with General Motors fuel system components. Other injector cleaners, while effective, may cause damage to plastics, plated metals or bearings. General Motors has completed extensive laboratory testing of GM Top-Engine Cleaner, and can assure its compatibility with General Motors fuel system components, as long as the cleaning procedure is followed correctly. |
: This bulletin recommends the use of pre-measured containers of GM Top-Engine Cleaner, P/N 12346535, - U.S. USAGE ONLY.
Pre-measured containers eliminate the need to measure the amount of GM Top-Engine Cleaner being added to the J 35800-A, injector cleaning tool. In Canada, use P/N 992872. It will be necessary to measure and dispense Top Engine Cleaner into the J 35800-A, injector cleaning tool.
Parts are currently available from GMSPO.