Vacuum leak help please

[tazjamin]

So ive been hearing this vacuum leak for quite some time now after I rebuilt my motor and ive narrowed it down but still not sure. You can only here it on the drivers side, now i have a catch can hooked up I thought maybe that but its not i bypassed that and it still is leaking but if i plug that line up it stops, so im thinking it could be a bad valve cover or valve cover gasket but it only a pin hole sound its not too big so is that something that it could be is a valve cover or gasket? Its just hard to figure out when these engines are tucked in the back there it hard to get good feel or hear on it and of course the motor is running while doing this i have tried a smoke test but never saw smoke there but i may have to try again. Any advise or help is much appreciated im just trying to solve this thank you


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[ezdaar]

with engine off, pump some air into crankcase. use a incense stick or a cig, you will find it fast

 

[justinesky]

Mine kind of does this too and iv narrowed it down to the air rushing past the fittings and throught catch cans. I even ran hardened airplane fuel lines to see if that helped

 

[tazjamin]

Well that was the one thing i was thinking is it could be just noise going through the lines and catch can. The engine runs great not like it has a vacuum leak but my gas mileage sucks and was thinking that could be my injectors or coil packs since those are the only two things I didn't replace yet since my rebuild


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