but since manifold vacuum is the vacuum source for the crankcase vacuum, if you have extra air going into the crankcase, its gotta be going into the manifold. which is essentially a vacuum leak.
if you had a whole in your power brake booster, it would be the exact same thing, except air's leaking into the booster instead of the block.
it doesn't matter whats in between the vacuum source and the opening to ambient pressure, your still gonna have more flow in that line.
Quote:
originally posted by PKRWUD
To answer your question, if you were to disconnect the line from the PCV to the intake, it would only become a vacuum leak on the intake side. The hose going to the PCV valve would not be a vacuum leak. So, if you disconnected that hose, and plugged it at it's source (intake), then the other side of it (valve cover or rear of intake manifold, depending on application), would just be an unfiltered vent for the crankcase, not a vacuum leak.
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if you disconnect the line and
plug it then yes, but were not talking about plugging the line line feeding the pvc valve, or isolating manifold vacuum. were talking about making an extra entrance for air to be sucked in thru, which will end up in the manifold, since manifold vacuum is the source.
pulling the oil cap and watching the idle increase is proof.