CAMPAIGN:INTAKE MANIFOLD GASKET
SUBJECT: LOWER INTAKE MANIFOLD GASKET
MODELS AFFECTED: CERTAIN 1993 CENTURYS WITH 2.2L ENGINE (RPO LN2; VIN CODE 4)
General Motors has determined that some 1993 Buick Century vehicles equipped with the 2.2L engine may have been assembled with a lower intake manifold gasket (between the intake manifold and the cylinder head) that can move out of position due to engine thermo cycling. This may result in rough engine idling, check engine light coming on, stalling and/or hesitation on acceleration.
To prevent these conditions from occurring, dealers are to replace the original black lower manifold gasket with a new light gray gasket on vehicles involved.
VEHICLES INVOLVED:
Involved are certain 1993 Buick Century vehicles equipped with the 2.2L engine within the following VIN breakpoints:
PLANT THROUGH AND YEAR PLANT CODE FROM INCLUDING ---- ----- ----- ---- ----------- 1993 Oklahoma City 6 P6400003 P6491481 1993 Ramos Arizpe S PS600009 PS637287
NOTICE: ONLY 835 VEHICLES WITHIN THESE RANGES ARE AFFECTED. PLEASE CHECK YOUR DEALER CAMPAIGN LISTING OR VISS TO DETERMINE CAMPAIGN STATUS ON VEHICLES.
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 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 vehicles may contain owner names and addresses obtained from State of 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 dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.
OWNER NOTIFICATION:
Owners will be notified of this campaign on their vehicles by Buick Motor Division (see copy of owner letter included with this bulletin).
DEALER CAMPAIGN RESPONSIBILITY:
All unsold new vehicles in dealers' possession and subject to the campaign MUST be held and repaired per the service procedure of this campaign bulletin BEFORE owners take possession of these vehicles.
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.
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 the 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 enters your 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.
PARTS INFORMATION:
A pre-shipment of gaskets will be sent to involved dealers on December 16, 1993. Pre-shipment will equal parts for 35% of the number of vehicles to be repaired. A minimum of one will be sent to dealers with involved vehicles. Pre-shipment parts will be charged to the dealers' open parts account.
Additional parts required to complete the campaign are to be obtained from General Motors Service Parts Operation (GMSPO). To ensure that these parts are obtained as soon as possible, they should be ordered from GMSPO on a C.I.O. order with no special instruction code, but on an advise code (2)
DESCRIPTION PART NUMBER QUANTITY/VEHICLE ----------- ----------- ---------------- Lower Intake Manifold Gasket 24574409 1
SERVICE PROCEDURE:
1. Relieve fuel pressure according to service manual page 6E3-C2-7.
2. With negative battery cable disconnected, remove air cleaner duct assembly and top half of air cleaner.
3. Remove torque strut from engine and rotate engine forward.
4. Remove vacuum hose harness from top of air inlet.
5. Disconnect crankcase ventilation valve and power brake vacuum hoses. Position vacuum hoses out of the way.
6. Remove transaxle fill tube attaching nut and position transaxle fill tube and indicator assembly aside.
7. Remove throttle modulator cover. (See service manual figure C2-12 on page 6E3-C2-12).
8. Remove bolts/nuts attaching throttle cable bracket. Position bracket and cables out of the way.
9. Disconnect spark plug wiring from the spark plugs and unroute harness.
10. Route power steering lines under the air inlet blower case.
11. Loosen the power steering pencil brace bolt at the power steering pump and remove the power steering pencil brace bolt at the lower intake manifold. Position brace aside (do not remove from vehicle).
12. Loosen the fuel line retainer under the intake manifold (refer to service manual section 6C).
13. Remove the fuel feed hose retainer from the intake manifold.
14. Disconnect both fuel lines from the lower intake manifold.
15. Remove lower intake manifold attaching nuts.
16. Remove the intake manifold with plenum attached from the cylinder head. Discard old gasket.
NOTICE: USE CARE IN CLEANING OLD GASKET MATERIAL FROM MACHINED ALUMINUM SURFACES AS SHARP TOOLS MAY DAMAGE SEALING SURFACES.
17. Clean and inspect the lower intake manifold and cylinder head mating surfaces.
NOTICE: MATING SURFACES MUST BE CLEAN AND FREE OF ANY FOREIGN MATERIAL, GREASE OR DIRT. DO NOT SAND OR ROUGH UP EITHER OF THE MATING SURFACES PRIOR TO INSTALLATION OF THE NEW GASKET.
18. Install new lower intake gasket and intake manifold assembly.
NOTICE: INSTALL THE LOWER INTAKE GASKET AGAINST THE CYLINDER HEAD BEFORE INSTALLING THE INTAKE MANIFOLD OR DAMAGE MAY RESULT. DO NOT USE ANY ADDITIONAL MATERIALS OR SEALANTS TO IMPROVE THE GASKETS SEALING ABILITY.
19. Tighten the lower intake manifold fasteners to 30 N.m (22 lbs. ft.) in sequence shown in figure C2-13, page 6E2-C2-14 of service manual.
20. Reverse removal procedure, being careful to re-route all lines, wiring, and cables back to original positions. Torques:
- Torque strut to engine bolt 55 N.m (41 lbs.ft.)
- Power steering pencil brace to pump and manifold 31 N.m (23 lbs.ft.)
- Transaxle fill tube attaching nut 25 N.m (18 lbs.ft.)
- Fuel line retainers 10 N.m (89 lbs.in.)
- Accelerator cable bracket nut 30 N.m (22 lbs.ft.)
- Accelerator cable bracket bolts 25 N.m (18 lbs.ft.)
- Fuel inlet retaining nut 30 N.m (22 lbs.ft.)
21. Tighten fuel filler cap and connect negative battery cable.
22. Cycle ignition "ON" and "OFF" twice, waiting ten seconds between cycles, then check for fuel leaks. If any leaks are detected, repair as necessary.
23. Start vehicle and check operation.
24. Advise owner that battery has been disconnected and that any memory functions, such as radio stations and clock may have been lost.
25. Install campaign identification label.
CAMPAIGN IDENTIFICATION LABEL:
Each vehicle corrected 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 a 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.
WARRANTY CLAIM INFORMATION:
PART FAILED PART FAILURE LABOR LABOR OTHER OPER COUNT PART NO ALLOW CODE OP NO HRS HRS -------------------------------------------------------------------------- o Replace lower intake manifold gasket 1 24574409 ** 96 V8373 1.3 *0.1
* Campaign Administrative Allowance
** The "Parts Allowance" should be the sum total of the current GMSPO Dealer Net Price plus 30%
Dear Buick Century Owner:
We, at Buick Motor Division, are comitted to improving the Buick customer ownership experience. We have discovered a condition that could develop on your vehicle and are writing to you today with our action to resolve this condition.
CUSTOMER SATISFACTION RECALL FOR:
Some 1993 Buick Century vehicles equipped with the 2.2L engine may have been assembled with a lower intake manifold gasket that will move out of position due to engine thermo cycling. This may result in rough engine idling, check engine light coming on, stalling and/or hesitation on acceleration.
ACTION:
------ To prevent these conditions from occurring, dealers replace the lower intake manifold gasket with a new gasket design, at no charge to you.
CONTACTING YOUR DEALER:
Please contact your Buick dealer as soon as possible to arrange a service date. Instructions for making this correction have been sent to your dealer and parts are currently available. Please ask your dealer if you wish to know how much time will be needed to schedule and process your vehicle.
OWNER REPLY CARD:
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 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.
