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loud humming

  1. Too much crankcase vacuum?

    Questions, Issues or Problems with the New Beetle
    2009 2.5l convertible making loud humming sound when air is on ( sometimes). Mechanic says it’s too much crankcase vacuum after he pulled dip stick and oil fill cap and heard sucking sound. I replaced valve cover/pcv valve, and it changed nothing. When I pull the oil cap it idles rough. Any...
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