ENGINE SURGE AFTER HOT SOAK CARB. PRIMARY METERING JETS

VEHICLES AFFECTED: 1983-86 C-P-C Produced V-8 Passenger Cars With E4ME Carburetors

Customer comments of engine surge after a hot soak may be received. A hot soak is when a vehicle has reached operating temperature, been 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 between 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 6C1) 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.

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 8.73mm (11/32 in.) 3. Install mixture control solenoid using tool, J-33815-1 or equivalent or by setting (lean stop) screw to the same number of turns recorded in step no. 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. 6. Check mixture control solenoid plunger travel which should be 3.18mm (4/32 in.). 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 degrees 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 package required.

17067279 - Air Horn Gasket One package required.

NOTICE: THESE METERING JETS CAN ALSO BE USED WITH CARBURETOR BLOWER FANS ON 'F' CARS (REF: PRODUCT SERVICE BULLETIN 86-650-101)

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.