CARBURETOR THROTTLE PLATE FREEZES (AIR INTAKE DUCT)

VEHICLES AFFECTED: 1985 'R' Model

Some 1985 'R' cars may exhibit an occasional no start condition due to ice forming on the throttle plate shaft in the carburetor. This condition is due to the ingress of snow into the underhood area and hence into the carburetor air intake system during driving in snowy conditions. This results in subsequent melting and refreezing of residual snow in the throttle plate and shaft area of the carburetor when the vehicle is parked, engine off, for a period of time (typically overnight) under freezing conditions. When a restart is then attempted, setting the choke causes the throttle plate to open and stick in the open condition due to the resistance of the ice overcoming the throttle return spring effort. This results in a no start condition.

Subject vehicles can be corrected by installing duct-air inlet, P/N 94408584, reference illustration 1, along with R/LH dust covers adjacent to the steering tie-rod holes. Reference illustration 2 for part numbers.

INSTALLATION OF NEW DUCT-AIR INLET

1. Loosen clamping bolt at duct to air cleaner.

2. Remove clamping nut from hold-down strap between duct and front end panel.

3. Remove duct-air inlet.

4. Install new duct-air inlet by reversing steps 1-3.

INSTALLATION OF DUST COVERS - SEE ILLUSTRATION 2 AND 3

1. Locate LH dust cover (shown in illustration 2, identified by approximately 1 inch square cut-out at lower, front, inboard corner) such that the two (2) holes in the cover are aligned with the two (2) existing holes in the sheet metal adjacent to the tie rod aperture.

2. With centre stem of clip extended, not pressed fully into clip, insert clips into holes in dust cover flange.

3. Press centre stem of clip towards dust cover flange until head of stem is seated in body of clip. Ensure that cover is firmly attached.

4. Following steps 1-3 similarly install the RH dust cover.

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.