CAMPAIGN: CARB. ANTI-DIESELING SOLENOID CONNECTION
MODELS: 1985-1986 C/K 25 LIGHT DUTY MODEL TRUCKS EQUIPPED WITH 5.7L GAS ENGINES (LT9), HEAVY DUTY FEDERAL EMISSIONS (H5D/NA5), AND 4 SPEED MANUAL TRANSMISSION (M20)
General Motors has determined that the engine electrical harness pigtail was not connected to the anti-dieseling solenoid on the carburetor of Flint production 1985-1986 light duty C/K 25 models equipped with 5.7L gas engines and manual transmissions and heavy duty Federal emissions. Not connecting the engine harness to this solenoid results in a curb idle speed of 600 rpm rather than the specified 800 rpm curb idle.
It is necessary to connect the existing engine electrical harness pigtail to the anti-dieseling solenoid to bring these vehicles into conformity.
VEHICLES INVOLVED
Involved are all 1985-1986 light duty model C/K 25 trucks equipped with 5.7L gas engines (RPO LT9) with heavy duty Federal emissions (H5D/ NA5) and 4-speed manual transmissions (M20) within the following vehicle identification and manufacture date parameters.
Flint Plant 1985 From Through 1986 ----------- --------- ------------ Line#1 FF710952 GF724660 1/1/85 4/24/86
Line#2 FF514844 GF523016 1/1/85 4/24/86
The specific vehicles involved in this campaign have been identified by Vehicle Identification Number Computer Listings. These listings are furnished to all involved dealers with the campaign 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 ensure the campaign correction 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 correction according to instructions contained in this bulletin.
If no owner's name and address were available to GMC Truck Division at the time of campaign initiation, the dealer will determine the owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.
GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of Owner Letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing 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 this campaign.
SERVICE PROCEDURE (Refer to Figure No. 1) -----------------------------------------
1. Remove the air cleaner assembly.
2. Locate the carburetor solenoid.
3. Inspection:
o If there is a single wire pigtail which is pink with a black stripe connected to the anti-dieseling solenoid no further action is required. Proceed to step 4.
o If there is nothing connected to the anti-dieseling solenoid locate the pink with a black stripe pigtail which is part of the engine harness and connect it to the anti- dieseling solenoid. Proceed to step 4.
o If there is a dark green electrical pigtail connected to the anti-dieseling solenoid unplug it and tape it back out of the way. Locate the pink with a black stripe pigtail which is part of the engine harness and connect it to the solenoid.
4. Reinstall air cleaner assembly.
WARRANTY INFORMATION
Dealers should submit a warranty claim on each vehicle completed under this campaign.
Labor *Time Operation Allow- Trouble Number Description ance Code --------- ----------- ------ ------- V4030 Conned Pigtail 0.2 hr. 96 to Solenoid
* Add 0.1 hr. for administration time allowance.
CAMPAIGN IDENTIFICATION LABEL
Each vehicle modified 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 (5) 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.
ADMINISTRATIVE PROCEDURE
Procedures covering this campaign are outlined in Section V of your dealership's "GMC Truck Claims Processing Manual" #SD8519.
----------------------------------------------------------------------------- Dear GMC Truck Owner:
General Motors has determined that the engine electrical harness pigtail was not connected to the anti-dieseling solenoid on the carburetor of your 1985 or 1996 light duty GMC truck equipped with a 5.7 liter gas engine and manual transmission and heavy duty Federal emissions. Not connecting the engine harness to this solenoid results in a curb idle speed of 600 RPM. This low idle may result in a rough running engine at idle and possible stumble on acceleration from idle. This deviates from the 800 RPM curb idle specified for this engine.
It is necessary to connect the engine electrical harness to the anti-dieseling solenoid to correct this condition. Your GMC Truck dealer will perform this service at no charge to you.
Instructions for making the connection have been sent to your dealer. Please contact your dealer to arrange a service date. The labor time to perfonn this service is approximately 20 minutes. Please allow additonal time for your dealer to process your vehicle.
The enclosed Owner Reply Card identifies your vehicle. Presentation of this card to your dealer will assist in making the correction to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid Owner Identification 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 GMC Truck Zone Office by telephone for assistance. The telephone numbers of the Zone Offices are listed in your Owner's Manual.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
GMC TRUCK DIVISION GENERAL MOTORS CORPORATION
Enclosure 86E11
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.
