CAMPAIGN: PULSAIR VALVE ASSEMBLY CORROSION

CERTAIN 1983 FIRENZA MODELS EQUIPPED WITH 2.0L LQ5 (VIN CODE P) AND AUTOMATIC TRANSMISSION (FEDERAL EMISSIONS) OR 2.0L LQ5 WITH AUTOMATIC AND MANUAL TRANSMISSION (CALIFORNIA EMISSIONS)

CONDITION

General Motors has determined that a defect which relates to motor vehicle safety may exist in some 1983 model year Oldsmobile Firenzas. Internal corrosion of the pulsair check valve assembly can permit exhaust gas to flow upstream to the plastic shut off valve possibly melting the valve. It could then be possible for a piece of the melted shut off valve to be drawn into the air cleaner, and subsequently into the throttle body where it could lodge against the throttle plate. If this condition were to occur, the engine may not return to idle upon release of the accelerator pedal. Although the vehicle can still be stopped with the service brake, loss of accelerator control could result in a vehicle crash without prior warning.

VEHICLES INVOLVED

Certain 1983 Oldsmobile Firenza models equipped with:

2.0L LQ5 (VIN Code P) engines and automatic transmissions (Federal Emissions)

2.0L LQ5 (VIN Code P) engines with manual or automatic transmissions (California Emissions)

Within the following vehicle breakpoint:

Year Series Plant Beginning Through and Including ---- ------ ----- --------- --------------------- 1983 Firenza Leeds Start of Production DK325799

DEALER ACTION

To prevent this condition from occurring, it will be necessary to inspect and, when necessary, replace the following:

A. Pulsair Check Valve Assembly with an assembly incorporating stainless steel components.

B. Pulsair Shut-off Valve with a newly designed valve.

Dealers are to perform this campaign on all involved vehicles 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 car inventory, or it is in your dealership for service, you are to ensure the campaign correction has been made before selling or releasing the vehicle.

SERVICE PROCEDURE

1. Remove air cleaner and disconnect rubber hoses from Pulsair Check Valve Assembly.

2. Disconnect the following components of the Pulsair Valve System:

a. electrical connector, b. vacuum hoses, c. air outlet pipe from Pulsair Check Valve Assembly, and d. air inlet hose to Shut-Off Valve.

3. Remove bolts (2) retaining Pulsair Check Valve Assembly to bracket.

4. Remove the Pulsair Check Valve Assembly and inspect the part number/date code stamped on it (refer to illustration). If the part number is 22048208, Pulsair Check Valve Assembly replacement is not required; proceed to step 5. If the part number is 22035900, replacement may be required after inspecting the date code as follows:

The date code is stamped near the part number (22035900) stamp. This date code consists of 7 digits (i.e. 12983XX). The first three digits are the Julian date code and fourth and fifth digit are the year code. If the date code is prior to 12983XX, then replacement of the Pulsair Check Valve Assembly is required. Parts produced on or after date code 12983XX do not require replacement.

5. Inspect the part number on the Shut-Off Valve (refer to illustration). If the number is other than 17075121, replacement is required (see steps 6 & 7); otherwise proceed to step 8.

6. Remove the Shut-Off Valve from the Pulsair Check Valve Assembly.

7. Install the new or inspected Shut-Off Valve into the correct Pulsair Check Valve Assembly.

8. Reassemble Pulsair Check Valve Assembly by reversing steps 2 & 3.

9. Reconnect rubber hoses to Pulsair Check Valve Assembly and reinstall air cleaner.

10. Install Campaign Identification Label.

CAMPAIGN IDENTIFICATION LABEL

Each label provides space to print the campaign number, and the five (5) digit dealer code of the dealer performing the campaign. Insert this information with a typewriter or ballpoint pen. When installing label, clean and dry the surface of the radiator support tie bar and apply the campaign label where it is readily visible.

PARTS INFORMATION

To ensure parts are obtained as soon as possible, order them from GM Service Parts Operation (GMSPO) on a C.I.O. order, with NO special instruction code, but order on an Advise Code (2). Use the following part numbers:

Description Part Number Quantity Per Vehicle ----------- ----------- -------------------- Pulsair Check Valve Assembly 22048208 1 Shut Off Valve 17075121 1

WARRANTY CLAIM INFORMATION

PC PART-NO TOT-PTS TC LAB-0P LHRS ST SUBLET -- ------- ------- -- ------ ---- -- ------ Inspect only, no further action required. 0 96 V4280 0.6 .1* ----

Inspect, replace Pulsair Check Valve Assembly only. 1 22048208 96 V4281 0.6 .1* ----

Inspect, replace Shut-Off Valve only. 1 17075121 96 V4282 0.6 .1* ----

Inspect replace Pulsair Check Valve Assembly and Shut Off Valve. 2 22048208 96 V4283 0.6 .1* ----

*Allowance for clerical administration.

Parts Allowance: Current dealer price, plus 30%.

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.