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1962 ford falcon idle screw on manual carb

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Anonymous Poster

Feb 10, 2009, 1:43 PM

Post #1 of 3 (2636 views)
1962 ford falcon idle screw on manual carb Sign In

Alright so I am trying to figure out which screw would adjust the idle on a manual choke carb. I just installed it and the idle is way too high. Any suggestions on what to look for?

Tom Greenleaf
Ultimate Carjunky / Moderator
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Feb 10, 2009, 2:07 PM

Post #2 of 3 (2634 views)
Re: 1962 ford falcon idle screw on manual carb Sign In

?? Does this calm down to a normal idle when choke is pushed OFF? I'm not totally familiar with what was intended with a manual choke and actually didn't think they were OE on this car at all. Some may not use a separate idle for choke as you decide the idle with your gas pedal and slowly shut choke down based on how it feels and whether it's ready and how much.

That becomes a time by time adjustment on YOUR/DRIVER'S part as it's no longer automatic. With manual chokes you may or may not need it again for hours after an engine warm up and hot days perhaps shut it off real quickly upon start up.

A carb designed to be a manual choke wouldn't use a step cam but may use a smooth one the is eccentrically holding idle up while choke is everything but OFF. Some OE vehicles came with a separate "throttle" knob for raised idle which you could about use as a cruise control and was separate from the choke.

Look hard - there may not be a separate screw for choked idle speed - just the primary one,


Tom Greenleaf
Ultimate Carjunky / Moderator
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Feb 10, 2009, 3:08 PM

Post #3 of 3 (2630 views)
Re: 1962 ford falcon idle screw on manual carb Sign In

Ok: If it has a screw for choked idle speed to be set it will use a "cam" without the steps as if by chance you pulled the choke when carb was on base warm idle it would fight itself trying to run upstairs of the steps so they use a smooth one.

You can see that from who knows who's carb in the pic below. If no such thing is on this carb it was meant to be manual idle speed by foot or a separate throttle cable which is more like a throttle lock - usually pull, twist to lock and it would stay there till you released it.

Not to be funny but manual chokes really suck! Best anti-theft control you could use as you have to get personal with each one to know how it will behave AND how long to leave it on or gradually take it off on a time by time basis.

They also don't use choke pull offs with a diaphragm and usually have either a hole in the plate or made such that it can't shut too tightly choking off all air for a quick flood. Most manual chokes required pumping the gas (automatic ones too) 1-3 or more times depending on how cold it was. Pumping a carb does "squirt" a shot of gas when you push the gas pedal with any tapping, pumping and continues to to change without a hiccup when you suddenly accellerate too.

By "cam" or "eccentric" I mean a thing like drilling a hole in a quarter dollar off center such that if it turned on that hole the distance changes with rotation - same crude idea,

Ps: In this pic below - see the rusted cam with the screw with spring such that it doesn't rattle to a new setting or fall out....

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