LTD L4-140 2.3L VIN A 2-bbl (1984)
YFA-1V FB And Non-FB Bowl Vent Check/Adjust
c. OPEN throttle so that the throttle vent lever does not touch the bowl vent rod. CLOSE the throttle to the idle set position, and measure the
travel of the fuel bowl vent rod from the OPEN throttle position.
d. Travel of the bowl vent rod - Dimension "A" should be within specification (0.100 to 0.150 inches).
e. If out of specification, bend the throttle vent lever at notch, to obtain required travel.
9. Remove all test equipment and reinstall air cleaner assembly. Tighten holddown bolt to specification.
50 States
NOTE: With YFA-1V Feedback Carburetor (FBC), Direct Current (DC) Motor Idle Speed Control (ISC) - Curb Idle Speed and Fast Idle Speed
Checks/Adjustments.
Instructions:
NOTE: If curb Idle is NOT within specification after performing this procedure, it will be necessary to perform the appropriate FBC Electronic Engine
Controller (EEC-IV) diagnostic procedure.
1. Preliminary Procedure:
a. Block wheels, apply parking brake, and bring engine to normal operating temperature.
b. Remove air cleaner, disconnect and plug vacuum line at bottom of air cleaner.
c. Turn off all accessories.
NOTE: After adjustments are completed, reconnect all parts.
2. Closed Throttle Plate Speed Adjustment (KILL SPEED):
a. Simultaneously hold throttle OPEN to maintain 1,000 Revolutions Per Minute (RPM) while pressing lightly on the ISC motor shaft.
b. After shaft retracts completely, RELEASE throttle and quickly unplug ISC motor connector.
c. Run engine for 60 seconds on the kickdown step (second highest step) of the fast idle cam.
d. If electric cooling fan comes ON during KILL SPEED, set procedure, DISCONNECT power lead and proceed.
e. Check closed plate RPM (700±25 rpm) while in NEUTRAL.
