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What exactly does it do? How does it work and why do some cars have them and others don't? Is it the difference between manual and automatic choke on a carb?
Thanks. I know it might seem like a dumb question to some.
 

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It routes hot air up to the choke to open the choke as the car warm up. An electric or a manual choke has no need for the choke tube.
 

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It takes filtered air from top of carb and passes it thruogh the manifold to heat it up and activate the spring in the choke. It needs to be clean air so the small piston in choke mechanism doesn't stick. Gary
 

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you have a hot box? in exhaust manifold that choke tube sticks into to suck hot air past spring of auto choke to cause flapper valve to open fully when hot and to remain partially closed during warm up to provide richer mixture while warming up. under carb is a snake like looking groove that somehow generates small vaccuum to pull hot air up the tube. my 6-cyl box in manifold collapsed and i was sucking raw exhaust gas thru my new Pony carb which didn't do it any good.
 
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