CAMPAIGN: AIR INJECTOR PIPE CORROSION/REPAIR REVISION

Model and Year: 1983 CHEVROLET CAPRICE, MALIBU, MALIBU WAGON, MONTE CARLO AND EL CAMINO MODELS EQUIPPED WITH 3.8L ENGINE (VIN CODE A) AND CALIFORNIA EMISSIONS (NB2)

General Motors has detemined that some 1983 Chevrolet Caprice, Malibu, Malibu Wagon, Monte Carlo and El Camino models equipped with RPO LD5 3.8L engine and California emissions may be emitting pollutants in excess of California emission standards. This may be attributed to the AIR Injection Tube corroding with increased mileage and exposure.

To correct this condition, the AIR Injection Tube and AIR Injection Check Valve will be inspected and replaced, if required. In addition, the carburetor primary vacuum break is to be inspected for proper operation. When required, the primary vacuum break, if found to be inoperative, will be replaced.

VEHICLES INVOLVED

Involved are certain 1983 Chevrolet Caprice, Malibu, Malibu Wagon, Monte Carlo and El Camino models equipped with RPO LD5 3.8L (VIN Code A) and California emissions (NB2) within the following VIN breakpoints:

MODEL PLANT FROM THROUGH ----- ----- ---- ------- Caprice Fairfax DX100163 DX157848

Malibu, Malibu Arlington DR100006 DR293986 Wagon, Monte Carlo & El Camino

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 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 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 Chevrolet 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 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 used vehicle inventory are to be contacted by the dealer, and arrangements made to make the required correction according to instructions contained in this bulletin.

PARTS INFORMATION

Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). To ensure these parts will be 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).

PART NUMBER DESCRIPTION QUANTITY/VEHICLE ----------- ----------- ---------------- 25518946 AIR Pipe Assembly 1 As required 22048579 AIR Check Valve 1 As required 17067466 Vacuum Break, Primary 1 As required 10031017 Clamp (3/4" to 1-3/4") 1 As required

SERVICE PROCEDURE

1. Open hood and install fender covers. Remove air cleaner assembly.

2. Inspect and replace, if necessary, AIR Injector Pipe and AIR Injector Check Valve (See Figure 1).

a. Inspect AIR Injector Pipe for color. If pipe is black, new pipe has been installed, proceed to Step 3.

b. If pipe is corroded or silver color, replace AIR Injector Pipe and Check Valve. Use a back up wrench to loosen pipe fitting from intake manifold fitting. Remove clamp from hose end at check valve. Remove AIR Injector Pipe, and AIR Check Valve.

c. Install new AIR Injector Pipe, AIR Check Valve and clamp.

3. Inspect and replace, if necessary, primary (front) vacuum break:

a. Check primary (front) vacuum break for leakage by applying vacuum with hand vacuum device (J-23738) or equivalent. The unit should hold the vacuum level. If vacuum level is held, proceed to Step 4.

b. If vacuum level is not held, replace primary (front) vacuum break unit.

c. Check vacuum break for proper setting (28 deg). If adjustment is required, reset using primary vacuum break adjusting procedure shown in Figure 2.

4. Reinstall air cleaner assembly and check engine operation. Check AIR Injector Pipe and Check Valve fittings for leakage.

5. Remove fender covers.

6. Install Campaign Identification Label. Close hood.

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 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.

CLAIM INFORMATION

Submit a Product Campaign Claim with the infomation indicated below.

* FAILED PARTS LABOR LAB OTH REPAIR PERFORMED PC PART NO. ALLOW FC OP HRS HRS ----------------------------------------------------------------------------- INSPECT AIR INJECTOR ** 00 V4370 0.2 0.1 PIPE, CHECK VALVE & PRIMARY (FRONT) VACUUM BREAK, NO FURTHER ACTION REQUIRED ----------------------------------------------------------------------------- INSPECT & REPLACE AIR 3 25518944 ** 00 V4371 0.5 0.1 INJECTOR PIPE, CHECK VALVE & CLAMP ONLY ----------------------------------------------------------------------------- REPLACE PRIMARY (FRONT) 1 17067466 ** 00 V4372 0.3 0.1 VACUUM BREAK & CHECK SETTING ONLY ------------------------------------------------------------------------------ INSPECT & REPLACE AIR 4 17067466 ** 00 V4373 0.6 0.1 INJECTOR PIPE, CHECK VALVE, CLAMP & PRIMARY (FRONT) VACUUM BREAK & CHECK SETTING

* Campaign Administrative Allowance ** The "Parts Allowance" should be the sum total of the current GMSPO Dealer Net price plus 30% of all parts required for the repair.

Dealers will automatically receive the correct labor and material allowance based on the labor operation performed.

Refer to the Chevrolet Claims Processing Manual for details on Product Campaign Claim submission.

(Notification Used By Chevrolet Motor Division)

Dear Chevrolet Owner:

This notice is sent to infom you that Chevrolet Motor Division is initiating a recall campaign that includes your vehicle.

REASON FOR THIS RECALL

General Motors has determined that certain Chevrolet Caprice, Malibu, Malibu Wagon, Monte Carlo and El Camino models equipped with 3.8L engine and California emission equipment, may be emitting pollutants in excess of California emission standards. This may be attributed to the AIR Injection Tube corroding with increased mileage and exposure.

WHAT WE WILL DO

The AIR Injection Tube and AIR Injection Check Valve will be inspected and, when necessary, replaced. In addition, the carburetor primary vacuum break will be inspected. When required, the primary vacuum break, if found to be inoperative, will be replaced. This service will be performed for you at no charge.

WHAT YOU SHOULD DO

Please contact your Chevrolet dealer as soon as possible to arrange a service date. Instructions for this service have been sent to your dealer. The labor time necessary to inspect your vehicle is approximately fifteen (15) minutes. If parts are replaced, up to approximately forty (40) minutes, will be required to service your vehicle. Please ask your dealer if you wish to know how much additional time will be needed to schedule and 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 reply card and returning it to us so that we may update our records. Should your dealer not schedule a service date within a reasonable time, you should contact your nearest Chevrolet Branch Office by telephone for assistance. The locations and telephone numbers of the Branch Offices have been attached for your convenience.

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

Chevrolet Motor Division GENERAL MOTORS CORPORATION

CHEVROLET BRANCH OFFICES

WHEN CALLING FOR ASSISTANCE, PLEASE ASK FOR THE CONSUMER RELATIONS REPRESENTATIVE.

ATLANTA HOUSTON General Motors Bldg. 13101 N.W. Freeway 5730 Glenridge Dr., N.E. Suite 101 Atlanta, GA Houston, TX 1-800-222-1020 1-800-222-1020 BOSTON KANSAS CITY 505 Blue Hill Drive 10800 Farley, Suite 100 Westwood, MA Overland Park, KS 1-800-222-1020 1-800-2?2-1020 CHARLOTTE LOS ANGELES 6000 Monroe Road 515 Marin St. Charlotte, NC Suite 101 1-800-222-1020 Thousand Oaks, CA CHICAGO 1-800-222-1020 475 Alexis R. Shuman Blvd. MEMPHIS Naperville, IL 866 Ridgeway Loop Avenue 1-800-222-1020 Memphis, TN CINCINNATI 1-800-222-1020 155 Tri-County Parkway MINNEAPOLIS Cincinnati, OH 7600 Metro Blvd. 1-800-222-1020 Edina, MN DALLAS 1-800-222-1020 130 E. Carpenter Frwy. NEW YORK Irving, TX 2500 Westchester Avenue 1-800-222-1020 Purchase, NY DENVER 1-800-222-1020 5460 Quebec St. PHILADELPHIA Suite 330 851 Duportail Road Englewood, CO Wayne, PA 1-800-222-1020 1-800-222-1020 DETROIT PITTSBURGH New Center One Bldg. Two Penn Center West Suite 485 Suite 200 3031 W. Grand Blvd. Pittsburgh, PA Detroit, MI 1-800-222-1020 1-800-222-1020 *PORTLAND ST. LOUIS 10300 S.W. Greenburg Rd. 83 Progress Parkway Suite 500 Maryland Heights, MO Portland, OR 1-800-222-1020 1-800-222-1020 *SAN FRANCISCO WASHINGTON 39465 Paeso Padre Parkway 1395 Piccard Drive Fremont, CA Rockville, MD 1-800-222-1020 1-800-222-1020 SYRACUSE UNITED STATES Salina Meadows Parkway Chevrolet Motor Division Suite 100 Customer Assistance Department Syracuse, NY 5505 Corporate Drive 1-800-222-1020 Troy, Michigan TAMPA Mail: P.O. Box 7047 Rocky Point Centre Bldg. Troy, MI 48009-7047 Eighth Floor 1-800-222-1020 3030 N. Rocky Point Dr. CANADA West Tampa, FL Customer Services Department 1-800-222-1020 General Motors of Canada Ltd. Oshawa, Ontario L1J 5Z6 (416) 644-6624

*NOTE: The state of ALASKA is serviced by the Portland Branch.

The state of HAWAII is serviced by the San Francisco Branch.

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.