Carburetor - Hard Start/Stalls/Poor Performance
84ford13 Article No. 84-14-13HARD STARTING/STALLS/POOR PERFORMANCE 5.0L HOLLEY 4180-C
FORD 1983 MUSTANG
LINCOLN-MERCURY 1983 CAPRI
Hard starting/stalls/poor performance may be due to binding choke linkage and improper function of the secondary throttle system.
The rework described below updates both systems to the latest design level. Refer to the 1983 Car Shop Manual, Powertrain, Section 24-28 for removal and assembly procedures.
1. Remove the air cleaner assembly.
2. Remove the carburetor assembly from the vehicle.
Figure 12:
3. Remove and save the choke cap and retaining ring, except if the choke cap identification is 47R-705A (Figure 12) in which case substitute cap number E3PZ-9848-N (Holley identification 47R-714A).
4. Remove and discard the choke housing assembly and carefully remove any excess gasket material from the main body.
Figure 13:
5. Remove the secondary throttle diaphragm housing, and remove and discard the gasket that interfaces with the main body (Figure 13). Carefully remove any excess gasket material from the diaphragm housing and main body. NOTE: Replace the gasket with gasket number B7A-9853-D. (Verify that the replacement gasket has an inner diameter of approximately .200 inches instead of .170 inches).
Figure 14:
6. Reinstall the secondary throttle diaphragm housing.
7. Procure and install choke housing assembly E3PZ- 9849-W, which has the latest design features, including an O-ring in place of the cork gasket. Verify that the O-ring is in position over the brass sleeve (Figure 14).
8. Set choke pulldown and check dechoke per the 1983 Shop Manual, Emissions Diagnosis.
NOTE: The pulldown adjustment location is at the bottom of the piston bore (Figure 14). The pulldown specification is 0.205 +/- .010 inches and the dechoke is 0.300 inches minimum.
9. Install tamperproof plug E3PZ-9E51 5-A over the pulldown adjusting screw (Figure 14).
10. Install a new choke gasket E4PZ-9871-A, and install the choke cap and retaining ring using breakaway screws E3PZ-9F671-A and the old Phillips head screw.
Figure 15:
11. Verify that the choke linkage is free by opening the throttle lever halfway, then slowly moving the fast idle cam downward (Figure 15). If binding occurs, verify that the choke link is properly installed into the choke lever and the retaining ring is in place.
Figure 16:
Figure 17:
12. Verify that a minimum of 0.005 inches clearance exists between the choke link and the air horn tower when the choke plate is in the maximum vertical position (Figure 16). When checking this, position the choke by moving the cam as in Step 11. If the clearance is less than 0.005 inches, then close the choke plate and lightly rap on the opposite end of the choke shaft until clearance is obtained (Figure 17).
13. Install the carburetor onto the engine, making the associated fuel, vacuum, and electrical connections.
14. Start the engine, and check for fuel leaks. Check and adjust idle speeds as necessary.
15. Reinstall the air cleaner and associated vacuum hose.
Obtain an Authorized Modifications decal and list the date, dealer number and summary of alterations performed. Select a prominent place adjacent to the Vehicle Emission Control Information decal suitable for installing the Authorized Modifications decal. Clean the area, install the decal and cover it with a clear plastic decal shield.
PART NUMBER PART NAME CLASS
E3PZ-9E515-A Plug C
E4PZ-9871-A Gasket C
E3PZ-9F671-A Screw B
B7A-9853-D Gasket C
E3PZ-9849-W Choke Housing C
E3PZ-9848-N Cap B
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP9510J83
TIME: 0.9 Hr. DLR. CODING: Basic Part No. 9510 Code: 41