CAMPAIGN:DIESEL ENGINES HIGH EMISSIONS

MODELS AFFECTED: 1984 GRAND PRIX WITH V-8 DIESEL ENGINES LOW AND HIGH ALTITUDE

CONDITION

General Motors has determined that certain early built 1984 Grand Prix models equipped with a 5.7L V-8 diesel engine may have been built incorrectly and, therefore, may not comply with exhaust emission standards.

Vehicles involved may have been manufactured with the following (2) two conditions:

A. The wiring harness leads to the altitude advance diode were reversed.

B. The wiring harness cold advance diode was reversed.

VEHICLES INVOLVED

Certain 1984 Grand Prix models with V-8 diesel engine built from the start of production through the following serial number.

ASSEMBLY UP TO AND MODEL PLANT BEGINNING INCLUDING ----- ----- --------- --------- Grand Prix Baltimore SOP EB214726

DEALER ACTION

Dealers are to perform this recall campaign at no charge to the owner on affected vehicles, regardless of time, mileage or ownership, and are to correct all affected vehicles in dealer new and used car inventory prior to sale.

Whenever a vehicle subject to this campaign is taken into your new or used car inventory in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling the vehicle.

Dealers are to perform the campaign services on all affected vehicles as they are brought in for any kind of service until all affected vehicles have been corrected.

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by Pontiac 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 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.

PART I SERVICE PROCEDURE

Correction A

Reverse the wire terminal leads in the engine harness connector to the altitude advance diode as follows:

1. Open hood.

2. Remove the altitude advance diode located on the engine wiring harness above the master cylinder. Refer to Figure 1.

3. With a small screwdriver, unlock the wire terminals from the engine wiring harness connector and remove the terminals from the connector.

4. Reverse the position of the two terminals and reinstall into the connector.

5. Reinstall the diode assembly on the engine wiring harness.

6. Correction B must also be performed.

Correction B

Reverse the direction of the cold advance diode in the engine wiring harness. Locate the cold advance diode (spliced into the engine wiring harness) as follows:

1. Open hood and locate the altitude advance diode located above the master cylinder. Refer to Figure 1.

2. Follow the light green/black wires from the altitude advance diode into the wiring harness conduit (approximately 14") to the taped splice. Do not remove tape from splice.

3. At this point you should see silver/gray tape which covers the cold advance diode. The diode has a dark green wire and light green wire with a black tracer leading to it.

4. Cut the dark green and light green wires so about 1" of the green wire is left on each side of the cold advance diode leads.

5. The cold advance diode should be soldered back into the harness with its leads reversed. That is; the light green wire on the diode should be soldered to the dark green wiring harness lead and the dark green diode lead should be soldered to the light green harness lead. This procedure can also be performed with electrical wire crimp on slices, if available.

6. Using electrical tape, tape over both solder or crimp joints to insulate them.

7. Carefully tuck the diode and wires back into the engine wiring harness conduit.

PART II INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL

Each vehicle modified in accordance with the instructions outlined herein will require a Campaign Identification Label. Each label provides a space to include the campaign number, the five (5) digit Dealer Code of the dealer performing the campaign service, and the date vehicle was campaigned. This information may be inserted with a typewriter or ballpoint pen. When installing label, clean the surface of the fan shroud and apply the campaign label.

Additional campaign labels are available on stationery order as Form 7201-709.

ENCLOSED WITH THE COPY OF THIS BULLETIN

A list of those vehicles involved which our records indicate are in your geographical area is attached for your follow-up. Advise the zone if vehicles appearing on the attached list are not in your area. If a list of vehicles is not attached, our records indicate no affected vehicles(s) in your area.

If a vehicle has been transferred or sold to another location, please forward the new name and address of the vehicle to your Pontiac zone office.

RECORDING COMPLETION

Campaign completion will be recorded from "PROPERLY COMPLETED AND PAID WARRANTY CLAIMS". Owners are being asked to present the owner reply card for identification to their dealer at the time they bring in their vehicle to have the campaign performed.

DEALERS SHOULD STILL SUBMIT WARRANTY CLAIMS FOR CREDIT IN THEIR NORMAL MANNER WHEN THEY PERFORM THE SERVICE AS FOLLOWS:

(A completed warranty claim is to be kept as a permanent record of completion.)

WARRANTY CREDIT

A separate repair order must be used for each vehicle.

OTHER* FAILURE LABOR LABOR LABOR DESCRIPTION CODE OPERATION HOURS HOURS ------------ ---- ---------- ----- ----- Both Corrections 96 V2261 0.3 Hr. 0.1 Hr.

*"In addition, dealerships will receive 0.1 hours credit for dealer administrative services associated with this campaign. The 0.1 hours allowance is to be entered in the "Other Labor Hours" field with each campaign repair listed for credit. This entry will not require zone authorization."

FAILURE CODE 96 MUST BE USED WITH THE LABOR OPERATION.

(CREDITING)

Dealers will be credited via Warranty Document or Terminal Transmission, whichever is their normal method of submission for payment. Claims must contain all information required and should list the labor operation as outlined.

Repair submitted for vehicles not involved in the campaign will not be paid.

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.