Quote:
Originally Posted by 80stech
The diaphragm controls manifold vacuum to the crankcase and it's a "closed" system so any crankcase leak is also vacuum leak. If the diaphragm ruptures you get excessive vacuum "leaking" to the crankcase if you want to look at it that way.
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The vacuum seemed about the same in the dipstick tube as in the crankcase. That would indicate that the diaphragm might have ruptured if your last sentence is true.
FWIW: I have not had any excessive oil consumption (though I really haven't driven it much this year) and I don't see any mayo very often except around the oil cap. No mayo visible in the vacuum lines that I can see.
Quote:
Originally Posted by 80stech
I don't know about that test but the drain for the CCV goes below the oil level so that it acts like a vacuum break for the cyclone, so yes, there should be bubbling if you force air down it.
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Ruptured diaphragm would cause both these symptoms then -- sounds like I'm taking the manifold and CCV off today then!! Thanks 80stech!