CAMPAIGN: REPLACEMENT PROM 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)
General Motors has detemined 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 recomended 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 irstructions 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 in 'formation indicated below:
* FAILED PARTS LABOR LAB OTH REPAIR PERORMED PC PART NO. ALLOW FC OP HRS HRS --------------- -- -------- ----- -- -- --- --- Replace Prom 1 1228417 ** 00 V4070 0.5 0.1
* Campaign Administrative Allowance
** The "Parts Allowance" should be the sum total of the current GMSPO Dealer Net price plus 30% of all parts required for the repair.
Dealers wi11 automatically receive the correct labor and material allowance based on the labor operation performed.
Refer to the Chevrolet Claims Processing Manual for details on Product Campaign Claim submission.
Dear Chevrolet Owner:
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, the calibrator in your vehicles Electronic Control Module (ECM) will be replaced. The new calibrator contains revised engine calibration infomation which will allow your engine to operate properly at the increased compression ratio. This service will be perfomed for you at no charge.
Instructions for this correction have been sent to your Chevrolet dealer. The labor time to perfom this service is approximately thirty (30) minutes. Please ask your dealer if you wish to know how much additional time will be needed to process your vehicle.
The enclosed Owner Identification Reply Card identifies your vehicle. Presentation of this card to your dealer will assist in making the correction in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid owner reply card and returning it to us so that we may update our records.
Should your dealer not schedule a service date within a reasonable time, you should contact your nearest Chevrolet Branch Office either in person or by telephone for assistance. The locations and telephone numbers of the Branch Offices have been attached for your convenience.
We are sorry to cause youthis inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
CHEVROLET BRANCH OFFICES
WHEN CALLING FOR ASSISTANCE, PLEASE ASK FOR THE CONSUMER RELATIONS REPRESENTATIVE.
ATLANTA HOUSTON
Chevrolet Customer Assistance 13101 N W Freeway 30007 Van Dyke Suite 101 Warren, MI 48090 Houston, TX 77040 1-800-222-1020 (713) 460-7301
BOSTON KANSAS CITY ------ ----------- Chevrolet Customer Assistance 10800 Farley 30007 Van Dyke Suite 100 Warren, MI 48090 Overland Park, KS 66210 1-800-222-1020 (913) 451-4380
CHARLOTTE LOS ANGELES --------- ----------- Chevrolet Customer Assistance 515 Marin Street 30007 Van Dyke Suite 101 Warren, MI 48090 Thousand Oaks, CA 91360 1-800-222-1020 (805) 373-9379
CHICAGO MEMPHIS
475 Alexis R Shuman Blvd 866 Ridgeway Loop Ave Naperville, IL 60566 Memphis TN 38117 (312)961-6380 (901) 756-3360
CINCINNATI MINNEAPOLIS
Chevrolet Customer Assistance 7600 Melro Blvd 30007 Van Dyke Edina, MN 55435 Warren, MI 48090 (612) 830-4044 1-800-222-1020 NORTH JERSEY CLEVELAND ------------ --------- 9 Sylvan Way 25000 Great Northern Parsippany, NJ 07054 Corporate Center (201) 993-4155 Suite 444 North Almsted. OH 44070 OAKLAND* (216)265-5600 ------- 39465 Paseo Padre Parkway DALLAS Fremont, CA 94538 ------ (415) 498-5080 130 E Carpenter Freeway Irving, TX 75062 OKLAHOMA CITY (214)659-5441 ------------- 6307 Waterford Blvd DENVER Suite 200 ------ Oklahoma City. OK 73118 5460 S Quebec St (405) 841-5000 Suite 330 Englewood, CO 80111 PHILADELPHIA (303)930-5720 ------------ 851 Duportail Rd. DETROIT Wayne. PA 19087 ------- (215)296-6600 Chevrolet Customer Assistance 30007 Van Dyke Warren, MI 48090 1-800-222-1020
PITTSBURGH
2 Penn Center W Suite 200 Pittsburgh. PA 15276 (412)928-5125
PORTLAND
10300 S W Greenburg Road Suite 500 Portland. OR 97223 (503)293-5000
ST. LOUIS --------- 83 Progress Parkway Maryland Heights, MO 63043 (314)895-8608 8609
SYRACUSE
Chevrolet Customer Assistance 30007 Van Dyke Warren, MI 48090 1-800-222-1020
TAMPA
3030 N. Rocky Point Dr. Suite 800 West Tampa, FL 33607 (813)885-5000
TARRYTOWN
2500 Westchester Ave. Purchase, NY 10577 (914) 251-5121
WASHINGTON
1395 Piccard Drive Rockville, MD 20850 (301)258-1444
CENTRAL OFFICES UNITED STATES ------------- Chevrolet Motor Division. Consumer Relations Dept. Chevrolet Central Office Warren, Michigan 48090 (313)492-5500
CANADA
Customer Services Department General Motors of Canada Limited Oshawa, Ontario L1J 5Z6 (416) 644-6624
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
