Recall - PROM Replacement
90chevy07Subject: 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)
Number: 87C09
Section: 6E
Date: July, 1987
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 perfomance, 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 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
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
Based on the number of vehicles involved (see attached listing) it is recommended that some quantity of parts be ordered upon receipt of this bulletin to allow for part availability upon owner request for vehicle modification.
SERVICE PROCEDURE
Replace original PROM with new P/N 1228417 PROM. Refer to the 1987 Light Duty Truck Fuel Driveability And Emissions Service Manual (ST-378-87). Section 3-103 (Figure 3-39)for instructions on PROM servicing.
CAMPAIGN IDENTIFICATION LABEL
Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label." Each label provides a space to include the five digit dealer code of the dealer performing the campaign service. This Information may be inserted with a typewriter or ball point pen.
Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.
Apply "Campaign Identification Label" only on a clean dry surface.
CLAIM INFORMATION
Submit a Product Campaign Claim with the information indicated below: