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Duplicate thread - I posted this in another forum, but I'm moving it here.
I need to replace my electric choke on a Holley 4160 (80457-1). The piston seems to be hanging up, and there's no way to smooth out that action. I'm confused which replacement to get. My choke has a port on the lower left that connects via tube to the carb (see first photo below). The replacements (45-223 or 45-224) do not have this port. They have an open air port with a screen. Do I just ditch the tube and plug the carb port? I'm assuming the 45-223 is the right one, as my carb has an internal vac source - unless I'm mistaken.
And what's the deal with the 45-240, which is a piston-less design?
Not going to be super helpful, but the newer choke assys you have both have a port that would have gone to the exhaust manifold for heat when started (1/4" hard line). There was also a return line from manifold that ended up at the carb where it would suck filtered air in, then thru manifold, and finally to choke housing. It did not suck exhaust gas, it had its own porting in manifold. Not sure they were used with an electric setup.
The only Holley choke setup I thought worked right was either a manual pull or one that was used on a 4180C. Never had much luck with the auto choke Holley; they worked in the absolute right conditions...maybe.
