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Guys- My carb (76 vette) is running extremly rich and stalls when coming to a stop.Also when you try to adjust the air mixture screws there is hardly any change when the screws are turned.My builder has had the carb apart twice and can't find anything out of place.He did notice that the accelerator shaft that goes in the side of the carb has some play in it and thinks i am loosing vaccuum and causing my problems.Could this be the problem and if so is it fixable?
thanx wade
if the float is adjusted wrong it could be dumping gas in but it would have to be way out of whack wouldn't hardly idle, when you turn the car off does gas pour into the carb, does it happen all the time or when its hot, has this mechanic of yours ever worked on a carb before because there arent too many things that it could be, one way to check vacuum is to spray i think it is carb cleaner around the seals to the vacuum lines and if the idle jumps then that the problem, maybe Lars will chime in, hes the master of carburetors on the CF.
From: At my Bar drinking and wrenching in Lafayette Colorado
Originally Posted by wadey
Guys- My carb (76 vette) is running extremly rich and stalls when coming to a stop.My builder did notice that the accelerator shaft that goes in the side of the carb has some play in it and thinks i am loosing vaccuum and causing my problems.Could this be the problem and if so is it fixable?
thanx wade
Highly unlikely. The slight amount of air than trickles by the throttle shaft has no effect on engine operation as long as the throttles are not binding up in the bores and causing an inconsistent return-to-idle speed. Further, any vacuum leak will lean the engine out - not cause a rich condition. You will not loose intake vacuum through a small leak - you can yank a vacuum hose right off the manifold without making any change to manifold vacuum levels (heck, the PCV system is a massive, calibrated vacuum leak, and every time you tap your brake pedal, operate your headlights, and move your A/C controls you induce massive vacuum leaks into the engine...). The throttle shafts are not your problem...
Rich running can be caused by about 20 different problems, none of them related to the shaft. You need someone competent to take a look at the carb.
Re-read Lars last sentence.... Your carb builder is your problem. Then tell him you're going to send it to Lars and ask for the "labor" charges to be refunded. [He DID pay for the repair parts...you owe him that; he DIDN'T fix the carb...you don't owe him for that.]