CAMPAIGN: INCORRECT POSITIVE CRANKCASE VENTILATION

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

DATE MAY 1996

MODEL: AURORA ------

DEFECT INVOLVED

General Motors has decided that certain 1996 model Aurora vehicles may have been built with an incorrect positive crankcase ventilation (PCV) valve. The incorrect PCV valve has a flow rate approximately 1 ft3/Min. less than the PCV valve released for the Aurora engine. Possible results could be lower engine oil life, a higher probability of varnish and sludge or higher idle air control flow with a potential effect on vehicle emissions.

To prevent the possibility of this condition from occurring, Aurora retailers are to inspect and if necessary, replace the positive crankcase ventilation (PCV) valve on all involved vehicles.

VEHICLES INVOLVED

Involved are certain (not all) 1996 Aurora model vehicles equipped with Federal and California Emissions, as listed below within the following VIN breakpoints:

PLANT ENGINE THROUGH & YEAR MODEL MODEL NAME CODE VIN VIN BEGINNING INCLUDING ---- ----- --------- ----- ----- ------------- -----------

1996 G AURORA 4 C lG3GR62C3T4112402 lG3GR62ClT4112995

Not all vehicles within the above breakpoints are involved.

Specifically, all of the following 169 vehicles are involved. They are all 1996 Aurora vehicles built at the Orion assembly plant (Plant 4). The VIN's for each involved vehicle are listed in alpha-numerical sequence by the last eight (8) digits.

1. 1G3GR62C3T4112402 16. 1G3GR62C5T4112434 31. 1G3GR62C9T4112470 2. 1G3GR62C0T4112406 17. 1G3GR62C9T4112436 32. 1G3GR62C0T4112471 3. 1G3GR62C2T4112407 18. 1G3GR62C0T4112440 33. 1G3GR62C2T4112472 4. 1G3GR62C6T4112409 19. 1G3GR62C2T4112441 34. 1G3GR62C4T4112473 5. 1G3GR62C8T4112413 20. 1G3GR62C6T4112443 35. 1G3GR62C6T4112474 6. 1G3GR62CXT4112414 21. 1G3GR62C7T4112449 36. 1G3GR62C5T4112479 7. 1G3GR62C1T4112415 22. 1G3GR62C3T4112450 37. 1G3GR62C1T4112480 8. 1G3GR62C3T4112416 23. 1G3GR62C5T4112451 38. 1G3GR62C5T4112482 9. 1G3GR62C9T4112419 24. 1G3GR62C2T4112455 39. 1G3GR62C8T4112489 10. 1G3GR62C0T4112423 25. 1G3GR62C4T4112456 40. 1G3GR62C1T4112494 11. 1G3GR62C4T4112425 26. 1G3GR62C6T4112460 41. 1G3GR62C5T4112501 12. 1G3GR62C6T4112426 27. 1G3GR62C8T4112461 42. 1G3GR62C4T4112506 13. 1G3GR62C8T4112430 28. 1G3GR62C3T4112464 43. 1G3GR62CXT4112509 14. 1G3GR62C1T4112432 29. 1G3GR62C7T4112466 44. 1G3GR62CXT4112512 15. 1G3GR62C3T4112433 30. 1G3GR62C0T4112468 45. 1G3GR62C1T4112513

46. 1G3GR62C2T4112519 88. 1G3GR62C9T4112632 130. 1G3GR62C0T4112762 47. 1G3GR62C9T4112520 89. 1G3GR62C6T4112636 131. 1G3GR62C1T4112771 48. 1G3GR62C2T4112522 90. 1G3GR62C8T4112637 132. 1G3GR62C6T4112779 49. 1G3GR62C8T4112525 91. 1G3GR62C8T4112640 133. 1G3GR62C5T4112787 50. 1G3GR62C1T4112527 92. 1G3GR62C7T4112645 134. 1G3GR62C9T4112789 51. 1G3GR62C0T4112535 93. 1G3GR62C9T4112646 135. 1G3GR62C3T4112805 52. 1G3GR62C4T4112537 94. 1G3GR62C0T4112647 136. 1G3GR62C2T4112813 53. 1G3GR62C8T4112539 95. 1G3GR62C4T4112649 137. 1G3GR62C8T4112816 54. 1G3GR62C8T4112542 96. 1G3GR62C0T4112650 138. 1G3GR62C1T4112818 55. 1G3GR62C5T4112546 97. 1G3GR62C2T4112651 139. 1G3GR62CXT4112820 56. 1G3GR62C7T4112547 98. 1G3GR62C6T4112653 140. 1G3GR62C0T4112826 57. 1G3GR62C9T4112548 99. 1G3GR62C8T4112654 141. 1G3GR62C4T4112831 58. 1G3GR62C0T4112549 100. 1G3GR62C1T4112656 142. 1G3GR62C6T4112832 59. 1G3GR62C7T4112550 101. 1G3GR62C3T4112657 143. 1G3GR62C7T4112838 60. 1G3GR62C2T4112553 102. 1G3GR62C5T4112658 144. 1G3GR62C9T4112839 61. 1G3GR62C8T4112556 103. 1G3GR62C3T4112660 145. 1G3GR62C9T4112842 62. 1G3GR62C1T4112558 104. 1G3GR62C7T4112662 146. 1G3GR62CXT4112848 63. 1G3GR62CXT4112560 105. 1G3GR62C2T4112665 147. 1G3GR62C1T4112852 64. 1G3GR62C1T4112561 106. 1G3GR62C4T4112666 148. 1G3GR62C3T4112853 65. 1G3GR62C3T4112562 107. 1G3GR62C5T4112675 149. 1G3GR62C7T4112855 66. 1G3GR62C7T4112564 108. 1G3GR62C7T4112676 150. 1G3GR62C4T4112859 67. 1G3GR62C9T4112565 109. 1G3GR62C9T4112677 151. 1G3GR62C9T4112873 68. 1G3GR62C2T4112567 110. 1G3GR62C0T4112678 152. 1G3GR62CXT4112879 69. 1G3GR62C4T4112568 111. 1G3GR62CXT4112686 153. 1G3GR62C4T4112893 70. 1G3GR62C6T4112572 112. 1G3GR62C3T4112688 154. 1G3GR62C6T4112894 71. 1G3GR62CXT4112574 113. 1G3GR62C5T4112689 155. 1G3GR62C8T4112895 72. 1G3GR62C1T4112575 114. 1G3GR62C8T4112699 156. 1G3GR62C5T4112899 73. 1G3GR62C3T4112576 115. 1G3GR62C1T4112706 157. 1G3GR62C5T4112904 74. 1G3GR62C5T4112577 116. 1G3GR62C3T4112710 158. 1G3GR62C6T4112913 75. 1G3GR62C5T4112580 117. 1G3GR62C4T4112716 159. 1G3GR62CXT4112915 76. 1G3GR62C0T4112583 118. 1G3GR62C6T4112720 160. 1G3GR62C7T4112922 77. 1G3GR62C0T4112602 119. 1G3GR62C1T4112723 161. 1G3GR62C6T4112927 78. 1G3GR62C2T4112603 120. 1G3GR62C9T4112727 162. 1G3GR62C8T4112928 79. 1G3GR62C8T4112606 121. 1G3GR62C2T4112729 163. 1G3GR62CXT4112929 80. 1G3GR62CXT4112610 122. 1G3GR62C0T4112731 164. 1G3GR62C9T4112937 81. 1G3GR62C7T4112614 123. 1G3GR62C6T4112734 165. 1G3GR62C0T4112941 82. 1G3GR62C4T4112618 124. 1G3GR62C3T4112738 166. 1G3GR62C4T4112943 83. 1G3GR62C6T4112619 125. 1G3GR62C7T4112743 167. 1G3GR62C4T4112974 84. 1G3GR62C8T4112623 126. 1G3GR62C2T4112746 168. 1G3GR62C7T4112984 85. 1G3GR62CXT4112624 127. 1G3GR62C4T4112747 169. 1G3GR62ClT4112995 86. 1G3GR62C9T4112629 128. 1G3GR62C6T4112748 87. 1G3GR62C5T4112630 129. 1G3GR62C6T4112751

NOTE: ALL OF THE ABOVE 169 VEHICLES WILL REQUIRE INSPECTION FOR THE CORRECT PCV VALVE. SOME OF THESE SUSPECT VEHICLES WILL ALREADY HAVE THE CORRECT PCV VALVE INSTALLED. THEREFORE, AFTER INSPECTION, ONLY SOME OF THE VEHICLES WILL REQUIRE A PCV VALVE REPLACEMENT.

All vehicles listed on the Aurora retailer's printout will require inspection and/or correction. Campaign involvement, or campaign completion of any vehicle(s) in question, can be verified by utilizing VISS (Vehicle Information Service System).

Involved vehicles have been identified by Vehicle Identification Number listings. Computer listings contain the complete Vehicle Identification Number, owner name and address data, and are furnished to involved Aurora retailers with the campaign bulletin. Owner name and address data furnished will enable retailers 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 Aurora retailer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.

PARTS INFORMATION

Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). Normal orders should be placed on a Daily Replenishment Order (DRO). An emergency requirement should be ordered on a Customer Special Order (CSO).

NOTE: Some of the 169 suspect vehicles will already have the correct PCV valve installed. it is estimated that about 6% (or approximately 1 0 vehicles) of the suspect population will require a PCV valve replacement.

DESCRIPTION PART NUMBER QUANTITY/VEHICLE ------------ ----------- ---------------

Positive Crankcase Ventilation 6487532 1 (as required) PCV Valve (AC Rochester Type CV 769 C)

OWNER NOTIFICATION

1996 Aurora owners will be notified of this recall on their vehicles by Oldsmobile Division (see copy of the owner letter included with this bulletin).

AURORA RETAILER CAMPAIGN RESPONSIBILITY

If there is evidence of intentional disablement of the emission system, the Aurora retailer is to notify the vehicle owner of this condition and ask if he/she wants the system restored. Restoration cost is the responsibility of the owner.

When a California emissions campaign is completed by a retailer, the retailer must provide the vehicle owner with a "Proof of Correction Certificate" which the owner may need to present to the California Department of Motor Vehicles (DMV) when renewing their vehicle registration. Without this correction certificate, the owner may be unable to renew their vehicle registration. Please confirm that service staff are currently trained in providing the certificate and that certificate pads are on hand.

All unsold new vehicles in the Aurora retailers' 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. After campaign is completed, the vehicle may be released for sale/delivery.

Aurora retailers 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 with no owner information indicated on the Aurora retailer's listing are to be contacted by the retailer, and arrangements made to make the required correction according to the instructions contained in this bulletin. This could be done by mailing to such owners a copy of the owner's letter included in 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 it is in your retail facility 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. Your cooperation in completing this campaign as soon as possible will be greatly appreciated.

SERVICE PROCEDURE

1. Remove PCV valve from the PCV valve grommet in the right (rear) camshaft cover (see Figure 1).

2. Inspect the PCV valve for the AC Rochester "Type number" (see Figure 2):

* If the AC Rochester Type number is CV 769 C, the PCV valve is the correct valve. Proceed to step 5.

* If the AC Rochester Type number is any number other than CV 769 C, the PCV valve is incorrect. Proceed to step 3.

3. Remove the PCV valve from the PCV valve hose.

4. Install new PCV valve P. N. 6487532 (AC Rochester Type CV 769 C) into PCV valve hose.

5. Install PCV valve into PCV valve grommet.

6. Install a Campaign Identification Label.

7. California retailers only: Provide owner with a "Vehicle Emission Recall Proof of Correction" certificate.

CAMPAIGN IDENTIFICATION LABEL

Each label provides space to include the subject corporate campaign number and the Oldsmobile retailer identification (dealer) code of the retailer completing the campaign service. This information must be inserted with a ball point pen. Servicing retailers are to ensure that these numbers are recorded and the label is properly affixed on a clean, dry surface of the radiator core support in an area clearly visible when the hood is raised. This label is to be used in conjunction with a clear protective plastic cover which will also be provided to retailers when labels are ordered. Additional labels and covers are available at no charge to you in sheet stock of forty nine (49) per sheet from the following source:

VISPAC, INCORPORATED 35000 INDUSTRIAL ROAD LIVONIA, MICHIGAN 48150

Phone: 1-800-269-51 00 (Monday - Friday 8:00 AM to 4:30 PM EST)

Important: Refer to Item Number S-1015 when ordering GM Campaign Identification Labels.

WARRANTY CLAIM INFORMATION

Aurora retailers are to submit claims using one of the "V" labor operation numbers below for each vehicle:

TOTAL FAILURE LABOR LABOR OPERATION PARTS CODE OPERATION HOURS --------- ----- ------ --------- ------

Inspect for correct PCV Valve Only 0 96 V9918 0.2 (AC Rochester Type CV 769 C)

Inspect PCV valve, wrong valve found, Replace with correct PCV valve: 1 96 V9919 0.2 AC Rochester Type CV 769 C (P.N. 6487532)

Administration Allowance: Add 0.1 hour for clerical administration to the time listed in the "Labor Hours" column.

Parts Allowance: The "Part Amount" should represent the retailer cost plus 40% allowance for handling.

May 1996

Dear 1996 Aurora Customer:

This notice is to inform you Oldsmobile Division is conducting an emission recall that includes your vehicle.

REASON FOR RECALL: General Motors has decided that certain 1996 model Aurora vehicles may have been built with an incorrect positive crankcase ventilation (PCV) valve. The incorrect PCV valve has a flow rate lower than the PCV valve released for the Aurora engine. Possible results could be lower engine oil life, a higher probability of varnish and sludge or higher idle air control flow with a potential effect on vehicle emissions.

To prevent the possibility of this condition from occurring, Aurora retailers are to inspect and if necessary, replace the positive crankcase ventilation (PCV) valve on all involved vehicles.

WHAT WE WILL DO: To correct this condition on your vehicle, we will inspect/replace the positive crankcase ventilation (PCV) valve at no charge to you.

WHAT YOU SHOULD DO: Contact your Aurora retailer to arrange a service date. Instructions have been sent to your Aurora retailer. It is estimated that parts will be available to your retailer May 30, 1996. Please ask your Aurora retailer if you desire an estimate of the total time needed to schedule, process and return your vehicle. Included in this time would be about twelve (12) minutes for a technician to inspect/replace the PCV valve. You may have your vehicle serviced at the authorized Aurora retailer of your choice.

EMISSION WARRANTY: To ensure your full protection under the emission warranty made applicable to your vehicle by 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 decided to be lack of proper maintenance of your vehicle. Also, your vehicle may fail a state or local emission inspection test if the recall work is not accomplished.

Should your Aurora retailer find that your emission system has been intentionally disabled, you will be asked if you wish the system to be restored so that it will function as designed. The cost of such restoration will be your responsibility.

IMPORTANT MESSAGE FOR CALIFORNIA RESIDENTS ONLY: The California Air Resources Board (CARB) requires that vehicle emission campaign be completed prior to California registration renewal. Uncorrected emission recall campaign will result in the inability to renew your California registration.

At the time of emission campaign completion, your California Aurora retailer will issue a "Proof of Correction Certificate". Keep this certificate and, if required, present it to the California Department of Motor Vehicles (DMV) when renewing your California registration as proof of campaign completion.

Should your Aurora retailer not schedule a service date within a reasonable time, please call Oldsmobile Customer Assistance (1-800-442-6537). Deaf. hearing impaired, or speech impaired persons with telecommunications devices for the deaf (TDD/TTY) may contact Oldsmobile Customer Assistance at 1-800-TDD-OLDS (1-800-833-6537). They will assist you and the retailer in getting your vehicle corrected.

If your Aurora retailer and Oldsmobile Customer Assistance are unable to remedy the condition within a reasonable time, you may wish to advise the Environmental Protection Agency at the following address:

DIRECTOR MANUFACTURERS OPERATIONS DIVISION (EN-340F) UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 401 M. STREET SW WASHINGTON DC 20460

COURTESY TRANSPORTATION: Should a delay in repairing your vehicle occur, to minimize your inconvenience, Aurora retailers may offer various courtesy transportation options.

OWNER REPLY CARD: The enclosed owner reply card identifies your vehicle. Presentation of this card to your Aurora retailer 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.

We are sorry for this inconvenience; however, we took this action to assure that your vehicle meets applicable government emission requirements and in the interest of your continued satisfaction with your Aurora.

OLDSMOBILE 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.