Carburetor - Hard Start/Stalling
84ford10Article No. 84-17-14
HARD START/STALLS - COLD ENGINE
(1.6L) - CARBURETED
FORD 1981-84 ESCORT, EXP
LINCOLN-MERCURY 1981-84 LYNX, LN7
CALIBRATIONS: See carburetor application charts
Vehicles which exhibit hard starting/stalls during cold start can be serviced by installing a new choke diaphragm cover and choke vacuum harness assembly.
1. Remove carburetor and choke cap as outlined in the 1983 Car Shop Manual, Powertrain, Escort/Lynx, EXP/LN7, Section 24-13-8 and 9. Examine the choke housing assembly for the presence of a "C"-spring. If a "C"-spring is present, remove and discard the spring and replace the index spacer as prescribed in TSB article number 83-2-6, published 1/25/83.
2. Remove the choke diaphragm cover by removing the three cover screws (or two screws and one rivet, as appropriate). Discard the screws and the diaphragm cover. Retain the choke diaphragm spring.
3. Reposition the diaphragm spring and install the new choke diaphragm cover from the kit. Apply one drop of Loctite #277 adhesive (or equivalent) to the diaphragm cover screw threads and install screws with washers. Torque screws to 10.6 in.lbs.
4. Remove choke housing retainer screws and washers and discard. Apply one drop of Loctite #277 adhesive (or equivalent) to the new choke housing retainer screws and install screws with washers. Torque screws to 21.0 in.lbs. (Use caution to avoid smearing Loctite on any parts within the choke housing.)
5. Adjust choke plate pulldown as follows:
a. Set the fast idle adjusting screw on the high step of the fast idle cam by temporarily opening the throttle lever and rotating the choke bimetal shaft lever counterclockwise until the choke plates are in the fully closed position.
b. Apply 17 in. Hg vacuum to the vacuum tube on the choke diaphragm cover. Apply a very light counterclockwise closing force to the choke bimetal shaft lever.
FIGURE 15:
NOTE: Insure that modulator spring (see Figure 15) is NOT compressed. (if too much force is applied and the modulator spring is compressed, an incorrect setting will result and cause numerous cold start and drive problems.)
FIGURE 16:
FIGURE 16 (CONTINUED):
c. Using the diameter drill specified in Figure 16, measure the clearance between the downstream side of the primary choke plate and the flat area of the airhorn wall.
d. Set choke plate pulldown to the dimension specified at Figure 16. If an adjustment is required, turn the vacuum diaphragm adjusting screw in or out as required.
6. Install index plate, electric choke cap, and retainer ring and reinstall carburetor as outlined in 1983 Car Shop Manual, Powertrain Escort/Lynx, EXP/LN7 Section 24-13-9.
FIGURE 14:
7. Disconnect all vacuum lines from the vacuum tree on the engine dash panel. Remove and discard the vacuum tree, and install the new vacuum tree from the kit. Connect the vacuum hoses and delay valve from the kit to the pulldown motor and the fuel separator as shown in Figure 14.
NOTE: Use care to orient the delay valve as shown in Figure 14, with the brown end of the valve towards the pulldown motor.
Reconnect all remaining vacuum lines to the vacuum tree assembly and cap any remaining open tubes.
8. Start the engine and check for leaks. Allow the engine to fully warm up and then check fast idle speed and, if necessary, reset the speed to the value specified on the emission decal.
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
E1PZ-9J554-D Choke Kit CG
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP9848A84
TIME: 0.9 Hr. DLR. CODING: Basic Part No. DRIVE Code: F5