UPDATE-CARB. REMOVAL & CARB. CHOKE ADJUST (NEW PROCEDURE)

VEHICLES AFFECTED: 1985-88 M-CAR - SPRINT/FIREFLY

The purpose of this bulletin is to provide Carburetor Removal procedure inadvertently omitted from the 1985 through 1988 Sprint Service Manual. Also, included in this bulletin is the Revised Carburetor Choke Adjustment which supersedes procedures printed in section 6C16 of the 1985 through 1988 Sprint/Firefly Service Manual.

NOTE: 1985-87 model year vehicles have Canadian emission, certification. For these vehicles use the appropriate Canadian Service Manual Supplement.

CARBURETOR REMOVAL:

PROCEDURE:

--------- REMOVE OR DISCONNECT -------------------- 1. Negative battery cable.

2. Air cleaner and duct assembly.

3. Drain engine coolant.

4. Fuel line at carburetor.

5. Two (2) coolant lines at choke housing.

6. Various vacuum lines at carburetor.

7. 6-Way electrical connector at carburetor.

8. 4-Way electrical connector at carburetor.

9. Throttle cable.

10. Four (4) retaining nuts for carburetor.

11. Carburetor assembly.

INSTALLATION

INSTALL OR CONNECT

1. New carburetor base gasket.

2. Carburetor assembly.

3. Four (4) retaining fasteners.

Tighten

Torque four (4) retaining fasteners to 18-28 N.m (14-20 ft.lbs.)

4. Throttle cable.

5. 4-Way electrical connector at carburetor.

6. 6-Way electrical connector at carburetor.

7. Various vacuum lines to carburetor.

8. Two (2) coolant lines at carburetor choke housing.

9. Fuel line to carburetor.

10. Add engine coolant.

11. Air cleaner and duct assembly.

12. Negative battery cable.

Start engine and check for leaks.

CHOKE

ADJUSTMENT CHECK:

1. Remove air cleaner and duct assembly.

2. Engine less that 25 degrees (77 degrees Fahrenheit).

3. Set choke and apply 10 inches of vacuum to choke pull-off.

4. Measure the air gap between air horn and choke plate.

Clearance should be 0.1mm - 0.5mm (.004 - .019 in.)

ADJUSTMENT:

----------- 1. Air cleaner and duct assembly removed.

2. Remove red epoxy seal on choke opening adjustment screw.

3. Rotate screw clockwise to increase choke plate opening or counter clockwise to decrease choke plate opening.

4. Reinstall air cleaner and duct assembly.

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.