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Old 06-17-2015, 08:28 AM
Rock&Roll Firebird Rock&Roll Firebird is offline
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Default Original carburetor - idle setup?

Hello guys, my '59 came with a very high idle setup. Not sure why, but I guess, it' somewhere around 1.500 rpm. Even with this setup the car runns without any visible problems (sofar). Can you please advise where on the carb the idle can be set? And also maybe what else to look for that could be related to this setup? Thank you.
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Old 06-17-2015, 08:36 AM
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simplyconnected simplyconnected is offline
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There are two adjustment screws for idle. Follow your shop manual procedure.

Sometimes the linkage wears. I'm talking about the parts on top of your intake manifold. After some fifty years, the holes become oblong and the rods tend to stick. Carefully inspect your linkage for this condition. - Dave
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Old 06-17-2015, 09:29 AM
Yadkin Yadkin is offline
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Examine the throttle shaft as Dave suggested. Everything needs to turn freely. The "bearing" and seal is the hard steel shaft and the soft pot metal casting.

If it's ovaled out you can have it worked by a machine shop and have bronze bushings installed. Or, many guys change these old carbs out in favor of aftermarket (IMO, inferior) ones that good old cores are readily available. I found a numbers matching one on ebay in the exact auction week that I needed one.

Examine the choke linkage (passenger side) with the choke fully open to make sure that the regular idle screw (drivers side) is actually setting the position. If you have a dashpot (again, driver's side) remove it to set the idle speed.

The purpose of the dashpot is to dampen the transition from higher engine speed back down to idle, preventing stall-out in some conditions. They tend to hang up and cause idle problems. I typically take it off and put it in a box along with other spare parts.
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