Lumina APV V6-191 3.1L (1990)
Technical Service Bulletin # 904456A
Date: 930801
Engine - Knocking Noise in Cold Ambient Temperatures
Number: 90-445-6A
Section: 6A
Date: August 1993
Corporate Bulletin No.: SPECIAL
Ase No.: A1, A8
Subject:
SPECIAL POLICY ADJUSTMENT PISTON PLATING WEAR
Model and Year:
1990 CHEVROLET LUMINA COUPE, SEDAN AND APV WITH 3.1L ENGINE
SPECIAL POLICY
To: All Chevrolet Dealers:
General Motors has determined that some 1990 Chevrolet Lumina Coupe, Sedan and APV model vehicles equipped with 3.1L engines may develop a
condition of premature wear of the pistons due to low adhesion of the tin plating. Evidence of this condition would be a cold engine knocking noise at
low ambient temperatures. This condition will not lead to engine failure and is typically limited to cylinders # 2, # 4, and # 6.
VEHICLES INVOLVED:
Involved are some 1990 Chevrolet Lumina Coupe, Sedan and APV model vehicles equipped with 3.1L engines and built within the VIN breakpoints as
shown in image.
OWNER NOTIFICATION:
Owners in specific cold climate states (see below) will be notified of this Special Policy by Chevrolet (see copy of owner letter included with this
bulletin).
STATES INVOLVED IN OWNER NOTIFICATION:
Alaska (AK)
Nebraska (NE)
Colorado (CO)
New Hampshire (NH)
Connecticut (CT)
New Jersey (NJ)
Delaware (DE)
New York (NY)
Dist. of Columbia (DC)
North Dakota (ND)
Idaho (ID)
Ohio (OH)
Illinois (IL)
Pennsylvania (PA)
Indiana (IN)
Rhode Island (RI)
Iowa (IA)
South Dakota (SD)
Massachusetts (MA)
Utah (UT)
Maine (ME)
Vermont (VT)
Maryland (MD)
Virginia (VA)
Michigan (MI)
West Virginia (WV)
Minnesota (MN)
Wisconsin (WI)
Montana (MT)
Wyoming (WY)
SPECIAL POLICY ADJUSTMENT:
This special policy covers the condition described above on vehicles in specific cold climate states for a period of six years or 72,000 miles. whichever
occurs first, from the date the vehicle was originally placed in service, regardless of ownership. If piston replacement is required due to this condition, an
engine replacement will be made at no charge to the owner rather than replacement of individual pistons. This Special Policy Adjustment applies ONLY
