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Old 05-21-2020, 06:13 PM   #1
rhphotord
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Default Autolite 2100 carb hesitation

Rebuilt this carb for my wife's 66 Mustang with a 289 cu engine
Has horrible hesitation from idle and have to feather the gas to get it moving up to speed. Actaually stalls if pushed too hard from a stop. All new internals...what am I missing here. Never had an isssued like this before rebuild. Ideas ?
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Old 05-21-2020, 09:34 PM   #2
wellcraft17
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Default Re: Autolite 2100 carb hesitation

Have you looked down the carb venturis while slowly moving the throttle shaft Activating the accelerator pump to see if any gas is being pumped down the throats. Lack of fuel will cause the problem you describe.
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Old 05-22-2020, 11:09 AM   #3
scicala
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Default Re: Autolite 2100 carb hesitation

It sounds like your problem is related to what wellcraft17 said. Also, check to make sure the accelerator pump diaphragm moves inward as soon as the throttle is even slightly opened, and that you have enough diahragm travel. This is adjustable by bending the long rod that goes to the accel. pump lever. There is also an orange rubber check valve that could be leaking behind the diaphragm. Also make sure the coil return spring is installed behind the diaphragm.

Sal
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Old 05-23-2020, 06:07 PM   #4
packrat5
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Default Re: Autolite 2100 carb hesitation

I am probably repeating what Scicala is saying, but also, there are several different lengths of the " push pin" on the accel pumps. Check your old pump against your new one, to make sure they are the same lengths. The adjustment holes must be correct also, there are several different types and several different combinations. In some kits there are "universal" pumps, and one or two push pin shims that are sometimes missing from the kits, or just ignored as "something extra" in the kit.
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