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Motorcraft Four barrel carb Idle Speed Adj... Help!

M

Motorcraftman

Member
Hi... on an 85 f-150 ford Van W 351 Windsor, and motorcraft 4 Barrel, Could Someone tell me where the Idle Speed Adj is Located specifically on this Carb...As I don't want to mess up the Choke Setting... Thanks! Larry
 
Idle speed is on the throttle shaft. It adjusts the throttle opening at idle. It rides on a cam that is linked to the choke.
 

Standing in front of the vehicle looking at the engine. all choke linkage is on the left side of carburetor. Throttle is on the right.

Have someone accelerate the foot feed from inside driver seat and watch the throttle linkage movement at the base of carburetor. Idle adjustment screw will be there.



If that 351W has a cast iron 4 barrel intake manifold, then that is a excellent system.

Good Luck,
whopist
 
It could have an anti dieseling idle solenoid on it, about like half a roll of Tums in the same location as noted by the others. The hex on the end adjusts to set idle. Jim
 
All the old heavy equipment operators used the term foot feed. Remember the old manual tansmission CATs that had a decelerator pedal?
 
When setting one of them up first you unhook it and set the base ideal of the carb and make all adjustments to the carb , also engine curb timing is set with the vac. lines unhooked as some dist come with a dual vac. system , one side of the vac. dia. retards base line timing while the other gives advance timing . The whole system was a pain in the drain . But once you had the base lines all set then ya hooked up all the vac . lines and plugged in the SMOOG ideal and set the ideal RPM's , this usually would bring the engine RPM's up around 150-200 RPM's higher . Then once you turned the key off the solenoid would allow the carb lingage to drop back to base line to reduce dieseling . I use to work at a Ford dealership back then . BUT when nobody was looking we would set them to RUN and forget about EPA . Little tricks like a BEE BEE in the retard line change the curve inside the dist. Add a few more degrees to the base timing , jet changes in the carbs , power valve changes .
 
Is that a spread bore carb? If so I have one that's never had gas in it that has been laying around for years I would part with if you need one. Chuck
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