CAMPAIGN: FUEL INJECTION PUMP TIMING DIESEL AND MAN TRANS.
SUBJECT: PRODUCT EMISSION CAMPAIGN 91C32 - FUEL INJECTION PUMP TIMING
MODEL and YEAR: 1991 C/K TRUCKS W/ 6.2L DIESEL ENGINES (RPO LH6) AND MANUAL TRANSMISSIONS
To: Select Chevrolet Dealers
General Motors has determined that certain 1991 C/K trucks with 6.2L diesel engines (RPO LH6) and manual transmissions may have the incorrect fuel injection pump timing and cold advance schedules. These trucks may experience cold running problems and fail to meet applicable emission requirements.
To correct this condition, dealers are to install a new calibration PROM in all involved trucks. Dealers are also to inspect and, if necessary, retime the fuel injection pump.
VEHICLES INVOLVED
Involved are certain (86 total vehicles) 1991 C/K trucks with 6.2L diesel engines built within the following VIN breakpoints:
PLANT YEAR MODEL PLANT CODE FROM THROUGH ---- ----- ----- ----- ---- ------- 1991 C/K Oshawa "1" M1110776 M1172598
1991 C/K Pontiac "E" ME106003 ME155986
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 involved dealers with the campaign bulletin. owner name and address data furnished 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 this 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
All unsold new vehicles in dealers' possession and subject to this campaign must be held and inspected/repaired per the service procedure of this campaign bulletin before owners take possession of these vehicles.
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.
Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer, and arrangements made to make the required correction according to instructions contained in this bulletin.
In summary, whenever a vehicle subject to this campaign enters your vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.
PARTS INFORMATION
Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). To ensure these parts will be obtained as soon as possible, they should be ordered from GMSPO on a "C.I.O." order with no special instruction code, but on an advise code (2).
Quantity/ Part Number Description Vehicle ----------- ----------- --------- 16161414 Calibration PROM 1
SERVICE PROCEDURE
INSPECTION INSTRUCTIONS
Inspect the fuel injection pump model number and serial number located on the fuel injection pump identification plate. The fuel injection pump must be retimed and the PROM replaced if either of the following is true:
- The model number is DB-2829-4894 and the serial number is less than 6633950, or
- The model number is DB-2829-4895 and the serial number is less than 6617332.
If neither of the above are true, only the PROM must be replaced.
PROM REPLACEMENT (Required For All Vehicles)
1. Disconnect negative battery cable.
2. Remove glove box insert.
3. Remove ECM.
4. Remove ECM access cover
5. Remove PROM from ECM.
6. Install new PROM and reinstall access cover.
7. Reinstall ECM.
8. Reinstall glove box insert.
9. Reconnect negative battery cable.
RETIMING PROCEDURE (Required Only For Some Vehicles - See Inspection Procedure) ------------------- Notice: Perform this retiming procedure with the engine off.
1. Loosen 3 pump retaining nuts and advance (toward driver side of vehicle) fuel injection pump timing 1 mm (equivalent to 2 degrees of crankshaft rotation).
2. Stamp a new timing line on front cover to match timing line on injection pump flange.
Also, stamp a letter "O" across the joint flange of both the engine timing cover and the injection pump to show the correct timing by alignment of both halves of the letter "O".
Notice: Page 6C2-8 of the 1991 C/K Truck Service Manual provides further details regarding this procedure.
FOR ALL VEHICLES
Install Campaign Identification Label when all campaign repairs are completed.
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 campaign number and the five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or a ball point pen.
CAMPAIGN IDENTIFICATION LABEL
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. Additional "Campaign Identification Labels" can be obtained from DAC.
Apply "Campaign Identification Label" only on a clean, dry surface.
CLAIM INFORMATION
Submit a Product Campaign Claim with the information indicated below:
FAILED PARTS CC-FC LABOR LAB * REPAIR PERFORMED PC PART NO. ALLOW OP HRS OTH ---------------- -- -------- ------ ----- ----- --- ---- Inspect/Retime Fuel Injection Pump And 1 16161414 ** SK-00 V6890 0.6 0.1 Install New PROM
Inspect Injection Pump/Install New 1 16161414 ** SK-00 V6891 0.4 0.1 PROM Only
* 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 will 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.
COPY OF LETTER TO CUSTOMER (Notification Used By Chevrolet Motor Division) ----------------------------------------------- July 22, 1992
Dear Chevrolet C/K Truck Owner:
This notice is sent to inform you that Chevrolet Motor Division is conducting an emission recall campaign that includes your vehicle.
REASON FOR THIS RECALL
General Motors has determined that certain 1991 C/K trucks with 6.2L diesel engines & manual transmissions may have the incorrect fuel injection pump timing and cold advance schedules. These trucks may experience cold running problems and fail to meet applicable emission requirements.
WHAT WE WILL DO
To correct this condition, your dealer will install a new calibration PROM. Your dealer will also inspect and, if necessary, retime your fuel injection pump. These services will be performed for you at no charge.
WHAT YOU SHOULD DO
Please contact your Chevrolet dealer as soon as possible to arrange a service date and to assure parts availability. Instructions for making this correction have been sent to your dealer. Please ask your dealer if you wish to know how much additional time will be needed to schedule and process your vehicle.
The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary correction in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid reply card and returning it to us. Should your dealer not schedule a service date within a reasonable time, you should contact the Chevrolet Customer Assistance Center by calling 1-800-222-1020.
If your dealer and the Customer Assistance Center are unable to remedy this condition within a reasonable, you may wish to advise the Environmental Protection Agency at the following address: Director, Manufacture's Operations Division (EN-340F), United States Environmental Protection Agency, 401 M Street. S.W., Washington, D.C. 20460.
To ensure your full protection under the emission warranty made applicable to your vehicle by State or Federal Law, and your right to participate in future recalls, it is recommended that you have your vehicle serviced as soon as possible. Failure to do so could legally be determined to be lack of proper maintenance of your vehicle. Also, your vehicle may fail a state or local emission inspection if this recall is not accomplished.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
Chevrolet Motor Division GENERAL MOTORS CORPORATION
Enclosure
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.
