ENGINE SURGE AFTER HOT SOAK CARB. PRIMARY METERING JETS

Model and Year: 1983-86 CHEVROLET PRODUCED V-8 PASSENGER CARS WITH E4ME QUADRAJET 4BBL CARBURETORS

TO: ALL CHEVROLET DEALERS

This bulletin cancels and supercedes Dealer Service Bulletin 86-60 Reissue (Section 6C) dated Dec., 1986. All copies of 86-60 Reissue should be destroyed, it did not include steps 8 or 9 of the reassemble procedure. Replacement of carburetor primary metering jets is covered under the 5 year/50,ooo mile emission warranty.

Customer comments of engine surge after a hot soak may be received. A hot soak is when a vehicle has reached operating temperature, then parked for a short time and restarted. The surge is caused by excessive fuel vapor in the carburetor bowl. This fuel vapor is created by the temperature difference of the carburetor bowl and the fresh fuel delivered from the fuel tank on a restart. This surge condition can be reduced by installing new design primary metering jets in the carburetor.

Part Numbers of Carburetors Affected:

17059320 17083218 17085202 17086004 17059322 17084201 17085203 17086005 17083204 17084205 17085204 17086006 17083205 17084208 17085207 17086040 17083206 17084209 17085218 17083207 17084210 17086003

Primary Metering Jet Replacement:

Refer to appropriate vehicle service manual (Section 6CI) for carburetor disassembly and adjustment information.

NOTICE: REPLACING THE PRIMARY METERING JETS IN THE E4ME CARBURETOR REQUIRES REMOVING THE MIXTURE CONTROL SOLENOID AND THE FLOAT. THEREFORE THE ADJUSTMENTS AFFECTING THESE COMPONENTS MUST BE CHECKED AND ADJUSTED, IF NECESSARY DURING REASSEMBLY. THE FOLLOWING STEPS SHOULD BE FOLLOWED AS A GENERAL GUIDE TO THE REPLACEMENT OF THE METERING JETS.

Jet Replacement Continued

Disassembly

1. Remove air cleaner. 2. Remove air bleed valve cover. 3. Remove air horn. 4. Remove solenoid adjusting (lean stop) screw and solenoid (rich stop) screw plugs. 5. Remove mixture control solenoid assembly.

NOTICE: IF TOOL #J 33815-1 OR EQUIVALENT IS NOT USED FOR REINSTALLING MIXTURE CONTROL SOLENOID, IT WILL BE NECESSARY TO RECORD NUMBER OF TURNS WHEN REMOVING ADJUSTING (LEAN STOP) SCREW.

6. Remove float. 7. Remove primary metering jet assemblies.

Reassembly

1. Install new primary metering jet assemblies.

2. Install float and adjust if necessary. The specification for float level is 11/32".

3. Install mixture control solenoid using tool,#J-33815-1 or equivalent or by setting adjusting (lean stop) screw to the same number of turns recorded in step #5 of Disassembly.

4. Install air horn with new gasket.

5. If carburetor has a removable pump lever hinge pin, install the cotter pin supplied in air horn gasket, following package instruction. should be 4/32". If not, adjust solenoid (rich) stop screw to obtain correct travel.

7. Install solenoid adjusting (lean stop) and solenoid (rich) stop screw plugs.

8. Check mixture control solenoid dwell with engine running in closed loop and canister purge disconnected. Dwell should read approximately 30 at idle. If not, adjust air bleed valve to obtain.

9. Reconnect canister purge and install air cleaner housing.

Parts Required

17082634 - Jet Assemblies One pkg. required 17067279 - Air Horn Gasket One pkg. required

NOTICE: THESE METERING JETS CAN ALSO BE USED WITH CARBURETOR BLOWER FANS ON CARBURETOR BLOWER FANS ON "F" CARS (REF: CHEVROLET BULLETIN 86-35).

Labor Operation Number: T1153

Labor Time : 1.2 Hours

THIS IS COVERED UNDER THE 5 YEAR/50,000 MILE EMISSION WARRANTY.

Chevrolet Motor Division General Motors Corporation

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.