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Old 04-12-2011, 03:25 PM
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Tomguy Tomguy is offline
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Join Date: Aug 2002
Location: near Scranton, PA
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weminghausen: There doesn't sound like there's anything wrong with your PCV. A rattling / non-seating valve is typical. You can ask to look at a generic in-line PCV similar to the one in your Benz (like a 1999 300M) if you want to compare. It will only close if there is a sudden pressure change where the manifold pressure is higher than the crankcase pressure.
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