CAMPAIGN: ENGINE / ECM HARNESS MISROUTED
MODELS AFFECTED: 1986 CENTURYS EQUIPPED WITH 3.8L --------------- V-6 ENGINES (ENGINE VIN Code 3)
General Motors has determined that some early 1986 Centurys equipped with RPO LG3, 3.8L engines have been assembled with the engine ECM wiring harness misrouted. This may result in the wiring harness shorting against the exhaust manifold in the engine compartment. This condition could cause engine starting problems and poor engine performance.
To prevent this condition from occurring, the engine wiring harness will be inspected, and where required, rerouted and/or repaired.
VEHICLES INVOLVED
Involved are some early 1986 Centurys equipped with LG3, 3.8L engines (engine VIN Code 3) within the following serial numbers:
PLANT FROM THROUGH AND INCLUDING ----- ----- --------------------- Doraville GD400001 GD413526 Oklahoma City G6400001 G6406611 Tarrytown GT400001 GT408800
DEALER MATERIAL
If your dealership has vehicles involved in this campaign, you will receive the following items:
o List of all vehicles involved in this campaign shipped to your dealership.
o One campaign identification label for each vehicle.
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 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.
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 IS IN YOUR DEALERSHIP FOR SERVICE IN THE FUTURE, YOU SHOULD TAKE THE STEPS NECESSARY TO BE SURE 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 modification according to instructions contained in this bulletin.
OWNER NOTIFICATION
Owners will be notified of this campaign by Buick Motor Division (See copy of owner letter included with this bulletin.).
PARTS INFORMATION
When required, material used in making repairs to the ECM wiring harness, such as tape, wire or wire connectors, are to be obtained from the dealership parts department.
TECHNICAL PROCEDURE
1. Open hood and disconnect the negative battery cable.
2. Raise the vehicle on a hoist.
3. Remove the right front wheel assembly.
4. Disconnect the engine harness from the starter solenoid.
5. Disconnect the A/C high pressure cutoff switch, A/C compressor clutch, and A/C head pressure switch connectors, if so equipped.
6. Pull the A/C and starter wiring harness back towards the dash panel. Reroute it over and outboard of the power steering inlet hose assembly, as shown in the illustration, View A.
7. Inspect the engine harness for melted areas near the main harness breakout. Repair as necessary.
8. Reinstall the wiring harness under the engine.
9. Reconnect the starter solenoid and A/C compressor connections.
10. Reinstall the wheel assembly.
11. Lower the vehicle.
12. Disconnect the fuel injector harness connector and the computer controlled coil ignition module connector.
13. Reroute the engine/ECM harness outboard of the heater hoses as shown in the illustration, View B. Repair as necessary.
14. Reconnect the fuel injector and coil ignition module connectors.
15. Reconnect the negative battery cable.
16. Install "Campaign Identification Label" according to instructions contained in this bulletin. Close hood.
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 digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ballpoint 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.
WARRANTY INFORMATION
Dealers are to submit each campaigned vehicle as a separate case on the one- line Warranty Document Form S-764. Dealers submitting warranty claims by terminal are to transmit campaign completions as a separate case also. List the one applicable labor operation.
FAILURE OPER. LABOR OTHER SUBLET OPERATION COUNT PART NO. ALLOW. CODE NO. HOURS HOURS MTL TWG --------- ----- -------- ----- ------ ---- ----- ------ ------- Inspect & * ** Reroute - - - 96 V3160 .5 .1 Wiring Harness
Inspect, * ** *** Reroute & - - - 96 V3162 1.0 .1 $2.00 Repair Wiring Harness
* Add .1 hour if vehicle equipped with air conditioner. ** Campaign administrative allowance. *** Material allowance for repairing harness.
Dear Buick Owner:
General Motors has determined that some early 1986 Centurys equipped with 3.8L engines may have been assembled with the engine "Electronic Control Module" (ECM) wiring harness misrouted. This may result in the wiring harness shorting against the exhaust manifold in the engine compartment. This condition could cause engine starting problems and poor engine performance.
To prevent this condition from occurring on your vehicle, your Buick dealer will inspect and when required, reroute or repair the ECM wiring harness. This service will be performed for you at no charge.
Instructions for this service have been sent to your Buick dealer. Please contact your dealer to arrange a service date. The labor time to inspect your vehicle is approximately 15 minutes. If the wiring harness must be rerouted or repaired, it will take an additional 45 minutes. Please ask your dealer if you wish to know how much additional time will be needed to 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 owner reply card and returning it to us.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
Buick Motor Division GENERAL MOTORS CORPORATION
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.
