F 250 2WD Pickup V8-351 5.8L VIN H 4-bbl HP (1985)
Carburetor Solenoid: Description and Operation
YFA Carburetor Feedback Solenoid
Fig. 3 YFA feedback carburetor assembly
This solenoid assembly is an integral part of the YFA feedback carburetor. The feedback solenoid operates as a pulse width modulated (dithering)
solenoid, varying the air bleed into the idle and main fuel metering circuits. The solenoid responds to commands from the EEC-IV system, thereby
varying the air/fuel ratio delivered to the engine, Fig. 3.
