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Autolite 4100 tuning

3613 Views 5 Replies 3 Participants Last post by  Ivy66GT
Hey guys, I have a 66 289 with an Autolite 4100 and trying to set the fuel/air mixture. Has anyone experienced that even with the screws all the way in they engine will still run and not stumble? The advance is set at about 800 and with the vacuum advance off.
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Hello. :) One thing to look at while you have the carb off would be the condition of the little holes that the idle air/fuel adjustment screws seat into. Sometimes people get the idea that 'run the screws all the way in until they are seated, and then back them out a turn and a quarter' means to tighten those screws until you have nearly stripped the threads. If the guy down at Magilla Automotive has worked on this carb, it could be that those holes are all beat up and it is not possible for the needle to seal the hole. :)
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