CAMPAIGN: INCORRECT POSITIVE CRANKCASE VENTILATION. Oldsmobile Aurora 1996

DATE: MAY 1996

SUBJECT: INCORRECT POSITIVE CRANKCASE VENTILATION (PCV) VALVE ----------------------------------------------------

Models: 1996 Oldsmobile Aurora 1996 Cadillac DeVille, DeVille Concours, Eldorado and Seville -------------------------------------------------------------

TO: ALL GENERAL MOTORS DEALERS

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General Motors of Canada Limited has decided that CERTAIN 1996 Oldsmobile Aurora, 1996 Cadillac DeVille, DeVille Concours, Eldorado and Seville model vehicles may have been built with 4.6 litre engines that contain the wrong positive crankcase ventilation (PCV) valve. This valve flows approximately one cubic foot per minute lower than the correct PCV valve released for this engine application. Possible results could be lower oil life, more probability of varnish and sludge, or higher idle air control flow with a potential effect on emissions.

To prevent the possibility of these conditions from occurring, dealers are to inspect and, if necessary, replace the positive crankcase ventilation (PCV) valve on all involved vehicles.

VEHICLES INVOLVED:

Involved are CERTAIN 1996 Oldsmobile Aurora, 1996 Cadillac DeVille, DeVille Concours, Eldorado and Seville model vehicles within the following VIN breakpoints:

Year Model Plant Plant Code From Through ---- ----- ----- ---------- ---- -------

1996 Oldsmobile Aurora Orion 4 T4112402 T4112995 1996 Cadillac Eldorado Hamtramck U TU612652 TU612974 1996 Cadillac DeVille Hamtramck U TU271685 TU273565 1996 Cadillac Seville Hamtramck U TU822974 TU823769

NOTE: PLEASE CHECK DCS SCREEN 445 OR YOUR V.I.N. LISTING BEFORE PERFORMING CAMPAIGN TO ENSURE THAT THE VEHICLE IS AFFECTED. ONLY AFFECTED VIN'S WILL BE PAID.

All affected vehicles have been identified by the VIN listing provided to involved dealers with this bulletin. Any dealer not receiving a listing was not shipped any of the affected vehicles.

DEALER CAMPAIGN RESPONSIBILITY:

All unsold new vehicles in dealer's 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 perform this campaign on all involved vehicles at no charge to owners, regardless of kilometres traveled, age of vehicle, or ownership, from this time forward.

Owners of vehicles recently sold from your new vehicle inventory with no owner information indicated on the dealer listing, are to be contacted by the dealer, and arrangements made to make the required correction according to instructions contained in this bulletin. This could be done by mailing to such owners a copy of the owner letter accompanying this bulletin. Campaign follow-up cards should not be used for this purpose, since the owner may not as yet have received the notification letter.

In summary, 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, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.

CAMPAIGN PROCEDURE:

Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.

OWNER NOTIFICATION:

All owners of record at the time of campaign release are shown on the attached computer listing and have been notified by first class mail from General Motors (see copy of owner letter included with this bulletin). The listings provided are for campaign activity only and should not be used for any other purpose.

PARTS INFORMATION:

Parts required to complete this campaign should be ordered through regular channels, as follows:

Part Number Description Quantity/Vehicle ----------- ----------- ----------------

6487532 Positive Crankcase Ventilation (PCV) Valve (As Required)

PARTS AND LABOUR CLAIM INFORMATION:

Credit for the campaign work performed will be paid upon receipt of a properly completed campaign claim card or DCS transmission in accordance with the following:

Repair Code Description Time Allowance

1A Inspect Only 0.3 Positive Crankcase Ventilation (PCV) Valve

2A Inspect/Replace 0.3 Positive Crankcase Ventilation (PCV) Valve

Time allowance includes 0.1 hour for dealer administrative detail associated with this campaign. Parts credit will be based on dealer net plus appropriate model year parts handling allowance.

SERVICE PROCEDURE:

PCV Valve Inspection

1. Open hood and grasp the PCV valve body. Gently remove the PCV valve from the camshaft cover grommet.

2. Grasp the PCV valve body and gently remove the PCV valve from the PCV tube hose.

3. Clean the base of the PCV valve with a clean shop towel and examine the PCV valve base for part identification markings. See figure below.

4. If the PCV valve base is marked "Type CV 769 C" the correct valve is currently installed and replacement is not required. Reinstall original PCV valve following the installation instructions described in Steps 5 and 6 then proceed to Step 7.

If the PCV valve base is marked "Type CV 895 C" valve replacement is required. Proceed to Step 5.

PCV Valve Replacement

5. Obtain a new PCV valve (Part Number 6487532) marked "Type CV 769 C" on its base. Apply a small amount of clean engine oil onto the PCV valve nipple and gently insert the PCV valve into the PCV valve hose. Be sure that the PCV valve is fully seated into the hose.

6. Grasp the PCV valve body and apply a small amount of clean engine oil onto the PCV valve base and gently install into the camshaft cover grommet. Be sure that the PCV valve is fully seated into the camshaft cover grommet and that the grommet remains properly positioned in the camshaft cover.

7. Install Campaign Identification Label and close hood.

INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL

Clean surface of radiator upper mounting panel and apply a Campaign Identification Label. Make sure the correct campaign number is inserted on the label. This will indicate that the campaign has been completed.

May 1996

Dear General Motors Customer:

To prevent the possibility of these conditions from occurring, your GM dealer will inspect and, if necessary, replace the positive crankcase ventilation (PCV) valve on your vehicle.

This service will be provided for you at no charge.

Please contact your GM dealer as soon as possible to arrange a service date.

If parts are required, ask your dealer for details regarding their availability. If parts are not in stock, they can be ordered before scheduling your service date.

This letter identifies your vehicle. Presentation of this letter to your dealer will assist their Service personnel in completing the necessary correction to your vehicle in the shortest possible time.

We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.

Customer Support Department General Motors of Canada Limited

Object Number: 87607 Size: SF

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.