G 3500 1 Ton Van V8-350 5.7L VIN K TBI (1987)
Technical Service Bulletin # 87C096E
Date: 870701
Recall - Incorrect Compression Ratio/PROM Update
Number:
87C09
Section:
6E
Date:
July, 1987
Subject:
PRODUCT EMISSION CAMPAIGN 87C09
INCORRECT COMPRESSION RATIO
Model and Year:
1987 G 30 VAN OVER 8,500# W/5.7L ENGINE (RPO L05, VIN CODE K) AND 3 SPEED AUTOMATIC TRANSMISSION
(RPO M40)
TO:
ALL CHEVROLET DEALERS
General Motors has determined that certain 1987 G 30 model vans may have been produced with an engine compression ratio of
9.3:1 rather than 8.6:1 as intended. While there is an improvement in performance, this condition may result in spark knock.
To minimize the possibility of spark knock, new PROMS have been released with revised spark advance calibrations which will
allow proper engine operation at the increased compression ratio.
Vehicles, Owner, Dealer, Parts and Service Information
VEHICLES INVOLVED
Involved are certain 1987 G 30 model vans over 8,500# and equipped with 5.7L engines (RPO L05, VIN Code K) and 3 speed automatic transmission
(RPO M40) built within the following parameters:
PLANT
FROM
THROUGH
Lordstown
H7100011
H7119304
Scarborough
H4100109
H4106259
Involved vehicles have been identified by Vehicle Identification Number computer listings. Computer listings contain the complete Vehicle
Identification Number, owner name and address data and are furnished to the involved dealers with the campaign bulletin. Owner name and address data
will enable dealers to follow up with owners involved in this campaign.
These listings may contain owner names and addresses obtained from State Motor Vehicle Registration Records. The use of such motor vehicle
registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of such listing to the
VEHICLES INVOLVED (CONT'D) follow up necessary to complete this campaign. Any dealer not receiving a computer listing with the campaign
bulletin has no involved vehicles currently assigned.
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by Chevrolet Motor Division (see copy of owner letter included with this bulletin).
DEALER CAMPAIGN RESPONSIBILITY
Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership from this time
forward.
Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service in the future, you
should take the steps necessary to be sure the campaign modification has been made before reselling or releasing the vehicle.
Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer and arrangements made to make the required
modification according to instructions contained in this bulletin.
PARTS INFORMATION
Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). To insure that these parts are
obtained as soon as possible they should be ordered on a C.I.O. order with no special instruction code, but on advise code (2).
PART NUMBER
DESCRIPTION
QUANTITY/VEHICLE
1228417
PROM
1