CAMPAIGN: CRUISE CONTROL SERVO BUSHING. GMC Truck Caballero 1984

For 1990-2009 cars

# CAMPAIGN: CRUISE CONTROL SERVO BUSHING

#### MODELS: 1984 GMC CABALLERO WITH CRUISE CONTROL (RPO K34) ON CERTAIN GASOLINE & DIESEL ENGINES

The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle which is subject to a recall campaign of this type must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to adequately repair within 60 days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time.

If the condition is not adequately repaired within a reasonable time, the owner may be entitled to an identical or reasonably equivalent vehicle at no charge, or to a refund of the purchase price less a reasonable allowance for depreciation.

To avoid having to provide these burdensome solutions, every effort must be made to promptly schedule appointments with owners and to repair their vehicles as soon as possible. As you will see in reading the attacbed copy of the letter which is being sent to owners, the owner is being instructed to contact the nearest GMC Zone Office if the dealer does not remedy tbe condition within five days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed how to contact the National Highway Traffic Safety Administration.

#### DEFECT INVOLVED

General Motors has determined that a defect which relates to motor vehicle safety exists in some 1984 GMC Caballero models equipped with cruise control (RPO K34) on certain gasoline and diesel engines. A small nylon bushing in the cruise control servo bail (bracket) may slip out of place. This will not affect the operation of the cruise control, but it may cause intermittent increases in engine speed or dieseling (engine run-on with ignition off). If the vehicle is not serviced and the nylon bushing remains out of place, the servo rod assembly could wear through the bail. If the rod wears through the bail, it may catch on other engine components and possibly result in a stuck throttle. Although the vehicle can still be stopped with the service brake, an unexpected loss of accelerator control could result in a vehicle crash.

To prevent this condition from occurring, dealers are to install a bushing kit on the cruise control servo bail. The cruise control servo assembly is not authorized as a replacement to correct for a missing or out of place bushing. Also, if other repairs are needed to the cruise control system, and the vehicle is out of warranty, tbe repair would be at the owner's expense.

#### VEHICLES INVOLVED

Involved are certain 1984 GMC Caballero model vehicles equipped witb cruise control (RPO K34) and certain gasoline and diesel engines. Involved VIN's are listed below:

1GTCW80N6ER500074 1GTCW80N1ER500192 1GTCW80N5ER500227 1GTCW80N3ER500369 1GTCW80NXER500501 1GTCW80N5ER500552 1GTCW80N6ER500561 1GTCW80NXER500594 1GTCW80N5ER500664 1GTCW80N5ER500678 1GTCW80N6ER500754 1GTCW80NOER500992 1GTCW80N7ER500990 1GTCW80N1ER501052 1GTCW80N1ER501181 1GTCW80N7ER501203 1GTCW80NXER501549 1GTCW80N3ER501781 1GTCW80NXER501874 1GTCW80N6ER501967 1GTCW80N4ER502132 1GTCW80N9ER502496

The specific vehicles involved in this campaign have been identified by Vehicle Identification Number Computer Listings. These listings and a new label for each vehicle for which there is no owner of record have been furnished to involved dealers with the campaign bulletin. If a vehicle has been recently delivered, and the owner's name is not on your VIN listing, please contact the owner to have the new label installed. It is your responsibility to see that the new label is installed on recently sold vehicles.

#### 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 ensure tbe 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 correction according to instructions contained in this bulletin.

If no owner's name and address were available to GMC Truck Division at the time of campaign initiation, the dealer will determine tbe owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.

GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170

#### OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of Owner Letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing 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 this campaign.

#### SERVICE PROCEDURE

#### NOTICE: Figures 1 through 4 are for gasoline engines. Although the servo rod assembly has a different shape and the servo may be rotated on diesels, tbe service procedure remains the same.

1. Raise hood and install a fender cover on the left fender.

2. Examine the cruise control servo. If the bushing in the bail of the servo looks like it was formed in place (a permanent part of the bail assembly see Figure 1), go directly to Step 12.

If the bushing is a"snap-in"bushing (with tabs) as shown in View "B" of Figure 2, continue to Step 3.

3. Disconnect any electrical and hose connections,if necessary, to the air cleaner and remove air cleaner assembly.

4. Before removing the spring retainer from its adjustment hole in the servo rod assembly, scribe a mark on tbe rod next to the hole to identify where the spring retainer is to be reinstalled (see Figure 2).

5. Remove the spring retainer DO NOT remove the "Z" pin.

6. Align the "Z" pin with the rod as shown in View "A" of Figure 2, then slide the rod rearward out of the bail (it may also be necessary to slightly collapse the servo diaphragm and move the bail forward).

Pinch the bushing flange with a pair of pliers and remove the bushing from the bail. Tbe bushing may not be in the bail hole as originally installed; it may be free to move on the servo rod assembly. Remove and discard the old bushing.

7. If the servo bail hole has a burr, file off the burr so that tbe bail surface is flat on both sides.

8. Obtain bushing kit (P/N 25111444). Install the bushing onto the bail as shown in Figure 3, so that the two tabs snap firmly in place. If the bail is bent (or twisted) so that the new bushing will not easily snap into place on the bail (as shown in Figure 3), straighten the bail as necessary.

9. Install the clip over the bushing and bail as shown in Figures 3 and 4.

Reinstall the servo rod assembly through the new bushing by positioning the "Z" pin as shown in view "A" of Figure 2. Reinstall the spring retainer in the original (marked) hole in the rod, pointing the spring retainer in the direction shown in Figure 4.

If the servo rod assembly is missing the "Z" pin, install a second spring retainer in the end hole normally occupied by the "Z" pin.

10. Ensure that the throttle mechanism will return fully to the idle position.

11. Reinstall tbe air cleaner assembly and reconnect hose and electrical connections as may be appropriate.

12. Remove fender cover from left fender, and close hood.

#### PARTS INFORMATION

Parts are to be obtained from General Motors Service Parts Operation (GMSPO). To ensure that 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 order under an advise code (2).

PART NUMBER DESCRIPTION QUANTITY ----------- ----------- -------- 25111444 Bushing Kit 1

#### WARRANTY INFORMATION

Dealers should submit a warranty claim on each vehicle completed under this campaign.

Labor Operation * Time Trouble Number Description Allowance Code ---------- -------------------- --------- ------- V5470 Inspect cruise control .2Hr 96 servo bail. No further action necessary.

V5471 Inspect cruise control .2Hr 96 servo bail and install bushing kit.

* For dealer to receive Administrative Time Allowance associated with this campaign, add 0.1 hour to the Labor Operation Time Allowance.

#### 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 tbe campaign service. This information may be inserted with a typewriter or 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 tbe owner.

Apply "Campaign Identification Label" only on a clean, dry surface.

#### ADMINISTRATIVE PROCEDURE

Procedures covering this campaign are outlined in Section V of your dealership's "GM Truck Claims Processing Manual" P 8819.

Dear GMC Owner:

This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. General Motors has determined that a defect which relates to motor vehicle safety exists in some 1984 GMC Caballero models equipped with cruise control on certain gasoline and diesel engines. A small nylon bushing in the cruise control servo bail (bracket) may slip out of place. This will not affect the operation of the cruise control, but it may cause intermittent increases in engine speed or dieseling (engine run-on with ignition off. If the vehicle is not serviced and the nylon bushing remains out of place, the servo rod assembly could wear through the bail.If the rod wears through the bail, it may catch on other engine components and possibly result in a stuck throttle. Although the vehicle can still be stopped with the service brake, an unexpected loss of accelerator control could result in a vehicle crash.

To prevent this condition from occurring on your vehicle, your GMC Truck dealer will install a new bushing in your cruise control servo bail. Even if you or someone else has removed the old bushing, a new design bushing must be installed to prevent the rod in the throttle linkage from wearing through the cruise control servo bail. This service will be performed for you at no charge. The above repair is for bushing replacement only and does not cover other repairs to the cruise control system.

Instructions for performing this service have been sent to your GMC Truck dealer Please contact your dealer to arrange a service date. The labor time necessary to perform this correction is approximately 15 minutes. Please ask your dealer how much additional time will be needed to process your vehicle.

Your GMC Truck dealer is best equipped to obtain parts and provide service to ensure your vehicle is corrected as promptly as possible. However, if you take your vehicle to your dealer on the agreed service date and they do not service this condition on that date or within five days, we recommend you contact your nearest GMC Truck Zone Office by telephone. The Zone Office will assist you and your dealer in getting your vehicle corrected. The telephone numbers of the Zone Offices are listed in your Warranty and Owner Assistance Information Manual.

After contacting your dealer and the Zone Office, if you are still not satisfied that we have done our best to remedy this condition without charge within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 400 Seventh Street, S.W., Washington, D.C. 20590, or call 800-424-9393 (Washington, D.C. residents use 366-0123).

The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary correction to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid owner reply card and returing it to us.

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

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.