Skylark V6-3100 3.1L VIN M SFI (1996)
Technical Service Bulletin # 99-06-04-005B
Date: 010901
Fuel Injectors - Hard Starts/Poor Driveability/Misfire
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 99-06-04-005B
Date: September, 2001
TECHNICAL
Subject:
Driveability Symptoms Due to Clogged Fuel Injectors
(Clean Injectors)
Models:
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).
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. 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.
Correction
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.
Notice:
^
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.
Important:
This bulletin recommends the use of pre-measured containers of GM Top-Engine Cleaner, P/N 12346535, - U.S. USAGE ONLY.
