Question about 1985 Ford F150

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I just rebuilt my F-150 1 barrel Carter carb (1985)once started runs great under all power ranges.Problem? Hard to start.

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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

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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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1 Answer

JUST REPLACED CARB ON MY 1992 CHEVY SILVERADO WITH A 4.3 LITER. NOW IT STARTS AND RUNS FINE UNTIL IT WARMS UP THEN DIES AND WONT START FOR 30 MIN


How many rpm's is it running at when you first start it up and it is running on the choke? Does it gradually start to idle back and then start to die r does it do it all of a sudden and dies?

When running with the choke on, it is on the high idle circuit of the carb, as it warms up the idle should slow down and then idle in the 800 rpm range in Park, 650 in Drive. This will be the low idle circuit range. This transition inside the carb will cover an idle air bleed hole in the venturi of the carb and lean out the mixture. If you notice that the carb smells gassy and black rich unburnt gases are coming from the tailpipe, the problem is located within the carb and requires a carb tech to do a rebuild of the carb. You could try a good carb cleaner like Lucas by putting it into the gas tank, in case you just got a bad tank of gas, but that is just a bandaid for a more deeply rooted problem. Get the carb rebuilt?

Nov 27, 2013 | Cars & Trucks

1 Answer

84 f150 carburetor out of tune


When you get a rebuilt carb you have no idea what the
applications are for

I suggest you rebuild your own,
that way you have all the settings
& experience when your done

I think the float needs to be set correctly
& maybe the pump if there is anything for that
external

You have to have some knowledge about basic
adjustments of air idle screws

Start about one turn out from seated & then use a
vacuum gauge to get the highest reading & then go in
a 1/4 turn
Can use a tach also or both,then reset the timing

I would have all 3 on motor at once

When done you set the idle screw with air cleaner on

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1 Answer

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You need to do a partial rebuild of the carb. Pull it off and put at least the needle and seat in it and also I strongly suggest a float.

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The firing order for that motor is 1-8-4-3-6-5-7-2 The carb is I imagine a carter afb or similar four barrel here is a great link to carter carbs copy this entire link into your address bar
http://www.rodandcustommagazine.com/techarticles/135_0402_four_barrel_carburetors_howto/index.html
I hope this helps you.

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New rebilt carter yfa installed, but idle at 3k all adjustment screws backed out, ? the 2.5 L 4 cylinder came from P O with a jury rigged rochester carb of 77 ford vintage, hard to start so I got the...


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1 Answer

85 ford f 150 hard to start when cold


well it could be that you need new spark plugs definatly new piston rings hmmmm was it hard to start before you put the new carb on?

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1 Answer

85 camero z28 want crank


Try to see if you are getting fuel up to the carb by pulling of the hard line and have someone crank the car hold line away from yourself and into a bowl or cup. The fuel filter is inside the carb i belive (if its a quadrajunk) also check that. If it is fuel injected check fuel filter should be back under the car near tank discenct and see if you are getting fuel.

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