CAMPAIGN: DECELERATION VALVE STUCK CLOSED
MODELS/YEARS: 1984 OMEGAS EQUIPPED WITH A 2.8L V-6 ENGINE (VIN X) & FEDERAL OR CALIFORNIA EMISSION SYSTEMS
CONDITION
General Motors has determined that certain 1984 Omega models equipped with a 2.8L V-6 engine (VIN X) and Federal or California emission systems may be emitting pollutants in excess of Federal and/or California emission standards.
The cause has been identified as a sticking deceleration valve which may not open, resulting in possible failure to meet HC emissions.
VEHICLES INVOLVED
Certain 1984 Omega models equipped with a 2.8L V-6 engine (VIN X) and Federal or California emission systems within the following vehicle identification numbers:
Assembly Plant Beginning Up to and Including -------------- --------- ------------------- Willow Run (W) EW342251 EW342716
DEALER ACTION
Dealers are to inspect the deceleration valve for date code, and if required replace the deceleration valve as directed in the Service Procedure section of this bulletin.
Whenever a vehicle subject to this campaign is taken into your 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 new vehicle inventory are to be contacted by the dealer, and arrangements made to make the required modification according to instructions contained in this bulletin.
SERVICE PROCEDURE
INSPECTION
1. Raise hood.
2. Inspect deceleration valve for date code. Refer to Figure 1 for valve and date code location.
3. If the date code on the valve is 1154B or 1174C it must be replaced.
4. Deceleration valves with date codes other than those listed in step 3 are NOT INVOLVED and no further action is required. Install the Campaign Identification label as directed in step 5 of the Valve Replacement Procedure.
VALVE REPLACEMENT PROCEDURE
1. Remove vacuum hoses from valve.
2. Remove two (2) screws securing valve to engine bracket and remove valve.
3. Install new valve and tighten screws to engine bracket.
4. Reinstall vacuum hoses.
5. Install Campaign Identification label. Each vehicle modified in accordance with the instructions outlined in this Emission 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. When installing label, clean the surface of the radiator upper mounting support and apply the campaign label where it is readily visible.
6. Close hood.
PART INFORMATION
Parts are to be obtained from WDDGM using the following part number:
Description Part No. ----------- -------- Deceleration Valve 14056425
To ensure that these parts will be obtained as soon as possible, they should be ordered from WDDGM on a C.I.O. order with no special instruction code, but order on an advise code (2).
WARRANTY CLAIM INFORMATION
Operation Failure Code Labor Operation Labor Hours --------- ------------ --------------- ----------- Inspect Deceleration 96 V2760 .2 Valve Date Code. Replacement Not Necessary
Inspect and Replace 96 V2761 .3 Deceleration Valve
Parts will be credited at dealer cost plus 30%.
.1 hour for clerical administration may be added to the above operations.
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.
