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Mod/Vintage Mustang Member
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239 Posts
Discussion Starter · #1 ·
Any thoughts on why the Butterfly won't move on my carb? 351C engine, stock 2 barrel carb set up. You can leave it running for as long as you want and it doesn't budge.
 

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Vintage Mustang Member
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97 Posts
Is it automatic choke or manual?
 

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Mod/Vintage Mustang Member
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239 Posts
Discussion Starter · #3 ·
Automatic. One other note, I can not even move it by hand.
 

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Vintage Mustang Member
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97 Posts
Your problem may be because the spring is broken in your choke housing. But, if your butterfly doesnt even move by hand, the spring may be way too tight on the choke, or something is broken in your choke housing. Take the cover off and inspect it. Also the piston in the choke housing may be rusted to the housing. if you take a screw driver, put it on the piston and tap it with a hammer, you may be able to free it up if that is your problem. Also inspect the rods connecting the valve to the choke. Hope this helps you.
 

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Mod/Vintage Mustang Member
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239 Posts
Discussion Starter · #6 ·
I will take a look at the choke as recommended. And yes, it was working fine. I went on a week vacation and come back to being stuck.
 

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Mod/Vintage Mustang Member
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239 Posts
Discussion Starter · #7 ·
Problem fixed?

OK, I am not sure if I fixed it or not, but I will keep an eye on it to see. Basically, I just tried to manually work the butterfly by moving the throttle, and then "click" it moved back to a closed position. The engine was not running at the time. I decided to play with it a little more, and could not get it to stick open again. I sprayed down the carb really well with carb cleaner and wiped it down. I drove the car for about an hour today, and it ran great. I am going to let it cool down overnight and see what happens.

The symptoms Iwould experience are, it would take the car a lot longer than normal to warm up, as the choke plate was not closing. Therefore, if I tried to drive the car, before it was really warmed up it would sputter and try to stall.


If anyone has any other suggestions as to what I could do to fix it, please throw them my way.

Tim
 

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Mark VII Member
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47 Posts
I think there is a good chance you got her licked. On the right (pasanger side) of the carb there are a set of linkages for the choke to work. Sometimes they get sticky with age. Also for it to move freely you should hold the throttel open while you try to move it.
 
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