Fuel System - Carburetor Removal and Choke Adjustment

9218chevy01

Number: 88-427-6C

Section: 6C

Date: August 1989

Corporate Bulletin No.: 936303


Subject:
CARBURETOR REMOVAL AND CARBURETOR CHOKE ADJUSTMENT


Model and Year:
1985-88 M CAR


TO:
ALL CHEVROLET DEALERS

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 Service Manual.

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 lb.ft.)

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 chock for leaks.

CHOKE

ADJUSTMENT CHECK:

1. Remove air cleaner and duct assembly.

2. Engine less than 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 0.1 mm - 0.5 mm (.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.