CAMPAIGN: 80 CITATION L-4 CA. ENGINE SAG ON LIGHT THROTTLE

General Motors has determined that a lean mixture condition may effect engine operation on certain early production 1980 Chevrolet California Citation Models. These vehicles may display an engine sag on light throttle application.

To improve light throttle operation, dealers are to install a plate over the hot idle compensator port, where applicable, and place a vacuum delay valve into the exhaust gas recirculation signal line.

VEHICLES INVOLVED

All 1980 Chevrolet Citation Models equipped with an L-4 engine and NB2 California equipment within the following parameters:

Plant From Through ----- ---- ------- Willow Run Start of Production To Be Determined Tarrytown Start of Production To Be determined

Vehicles have been identified by Vehicle Identification Number Computer Listings. The listings have been furnished to involved dealers with the campaign bulletin. Any dealer not receiving a computer listing with the campaign bulletin was not shipped any involved vehicles.

OWNER NOTIFICATION

No owner notification will be required since all involved vehicles are in dealer stock.

DEALER CAMPAIGN RESPONSIBILITY

All involved vehicles are not to be sold by the dealer until modification has been completed.

DEALER ACTION

Dealers are to install the furnished delay valve assembly, and, when applicable, the furnished hot idle compensator plate and gasket. A new emission label for each vehicle on your V.I.N. list must be installed as directed in the service bulletin.

SERVICE PROCEDURE

1) Open hood and install protective fender cover.

2) Remove the air cleaner.

3) On A/C vehicles, remove two attaching screws and remove the original hot idle compensator (HIC) and gasket (Figure 1).

4) Install the new gasket and hot idle compensator plate provided in the package.

5) On both A/C and non A/C vehicles, disconnect vacuum hose at exhaust gas recirculation valve (EGR).

6) Install the delay vacuum valve supplied between the EGR valve and the removed vacuum hose. Valve must be installed with the blue end toward vacuum source (AWAY FROM EGR VALVE)-(Figure-2).

7) Check and adjust, as necessary, carburetor idle speed and solenoid idle speed per instructions and specifications on underhood vehicle emission control information label.

8) Install the air cleaner.

9) Clean the old emission label with soapy water and wipe dry.

On A/C vehicles, new emission label No. 10011537 P6 provided should be applied over old emission label No. 10009952 FH. --- On non A/C vehicles, new emission label No. 10011538 P7 provided should be applied over old emission label No. 10009953 FJ. --- The new emission labels P6 or P7 provided are specific to involved vehicles only.

10) Remove protective fender cover and close hood.

PARTS INFORMATION

The part kits necessary for completion of this modification are being forwarded to Chevrolet Zone Offices. Dealers are to obtain parts, no-charge, as required from their zone office.

Part kit contents are: Delay valve assembly, hot idle compensator plate and gasket. The hot idle compensator plate and gasket are used on vehicles with A/C only. Emission labels are either 10011537 P6, A/C vehicles, or 10011538 P7, non A/C vehicles.

WARRANTY INFORMATION, FAILURE CODE, LABOR TIME ALLOWANCE, FAILED LABOR

OPERATION AND CONDITION CODE

Dealers are to submit each campaigned vehicle as a separate case on the one-line Warranty Claim Form, GSD-970,

The Campaign Failure Code, Labor Operation Number and Condition Code are to be submitted exactly as shown on the example GSD-970 one-line Claim Form included in this campaign bulletin.

Dealers submitting warranty claim applications on the Chevrolet Dealer Communication System are to submit campaign claims via the Dealer Communications Terminal according to the campaign claim procedure documented in the Chevrolet "Dealer Communication System-Operation Guide."

Failed Failure Labor Time Labor Condition Code Allowance Operation Code Description ------- ---------- --------- --------- ----------- 1A .4 Hours 8OC10 89 Install Carburetor parts kit and new emission label

Dealers will automatically receive .1 Hours Dealer Administrative Detail Associated With This Campaign.

Dealers will automatically be credited 30% of Dealer Net when parts are furnished, no charge by Chevrolet ($.37).

ADMINISTRATIVE PROCEDURE

THE APPROPRIATE CAMPAIGN HANDLING AND ADMINISTRATIVE PROCEDURE MAY BE FOUND IN THE CHEVROLET SERVICE POLICIES AND PROCEDURE MANUAL, SECTION 4, PAGES 1 AND 2, DATED OCTOBER, 1978, IN YOUR DEALERSHIP.

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.