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Engine running rough

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Magisterol

Well-Known Member
Joined
Nov 26, 2019
Messages
293
Hello guys. I have a problem with my engine and so far all the AME couldn’t find the culprit. For a few month the engine started to run rough when I bring the power back below 2500 rpm. It goes away if I lean it as long as I stay above 2000 rpm and it is a bit better if I bring it all the way to idle. It is worst if the carb heat is on and it doesn’t make a difference on L or R mag. It drops within the range on single mag ops but no difference between L and R. The engine is an O-320 E2A with a 8.5:1 pistons, MA-4SPA, 10-3678-32 carb with single piece venturi, blue float with 47-773 jet. Now for whatever reason, it started to go rough even on the ground when I do mag check at 1700-1800 rpm. So I fave to lean all the time even on takeoff. The exhaust stacks started to get black soothe on them when I run my finger inside. The consensus is that is running rich. I tried flying without the air filter and it does the same. Either too much fuel or not enough air. Thing is, it was running fine before. Other than borr someone else’s car and try it, would be to buy another carb, but nobody is sure if it is the carb or something else, because on the ground when it runs rough, it is not blowing black smoke. Any ideas? Thank you
 
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