Question about 1985 Ford F150
Should adjust the butterfly to about 3/8" opening at 50 degrees farenheit when engine is cold. Usually about 1 mark to the lean side on the choke spring housing. If unsure set the choke to the center mark than richen up one mark at a time until the engine starts and idles up when cold after properly setting choke by fully depressing and releasing the accelerator before cranking. If it doesn't idle up enough turn up the fast idle screw 1/2 turn at a time. Another common problem with the YFA is the choke heat riser tube rusting off at the manifold and the choke not unloading when the engine warms. Install a new riser tube after using a drill bit the same diameter as the tube to drill out the remainder of the old tube in manifold before inserting the new tube and attaching to choke housing.
Posted on Jul 04, 2013
Check and clean the Choke mechanism, the YFA carburator used in the mid 80's on the 300 cu in six cylinder, is very bad about sticky choke mechanisms, look at the choke butterfly 1st thing in the morning, is it closed, partially closed or fully open, it should close partially in the morning. This choke should be adjustable look at the side of the carburator for a large plastic disk with notches at the top, loosen screws and rotate to adjust, adjust it with engine cold only. Hope this helps, let me know.
Posted on Aug 04, 2010
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Posted on Jan 02, 2017
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