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Thread: Why would my PCV be buzzing?

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  1. #1
    pnut is offline CHR Member Visit my Photo Gallery
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    Apr 2006

    Why would my PCV be buzzing?


    Small block Chevy with Qjet.

    MPCV valve is buzzing. The sound is like a radio controlled airplane engine (but quieter). I am sure it is the PCV, I pulled it out with the carb vac hose attached and the engine running, and could see the pellet "bouncing" off the the top from vacuum.

    Is it simply bad, or do I need to use the back PCV port on the Qjet (On one of my previous posts this was mentioned).

    Glad I bought the mechanics stehescope, it led me right to the PCV.

  2. #2
    TooMany2count's Avatar
    TooMany2count is offline CHR Member Visit my Photo Gallery
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    Jun 2003
    Car Year, Make, Model: 48 Chevy 1ton Bus

    wrong one for the amount of vacuum your pulling, had the same problem on a crate motor. went through about 4-5 before i got he correct one...joe
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  3. #3
    65ny's Avatar
    65ny is offline CHR Member Visit my Photo Gallery
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    Sep 2006
    Car Year, Make, Model: '65 New Yorker, '67 Newport

    How do you tell if one is good or not??

  4. #4
    C9x's Avatar
    C9x is offline CHR Member Visit my Photo Gallery
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    Dec 2004
    N/W Arizona
    Car Year, Make, Model: Deuce Highboy roadster

    Quote Originally Posted by DennyW
    Absolutely. They are different although they may look a like.

    Remember also, just because one rattles, doesn't mean it's good.

    Are they ID'd for vacuum level by the letter seen on the piston?

    I pulled a 455 Buick valve and replaced it with an SBC valve since I required a 90 degree turn for the hose.
    The Buick piston was marked with the letter "A".
    The SBC was "E" or "F", not sure there.

    I asked about vacuum levels, but that was a new one on the parts guy.
    I settled for a generic brand and it's working well.
    Better than the original Buick methinks.

    The generic SBC valve probably doing ok due to the mild cam in the big Buick engine.

    I took a look at a 400-M Ford Cleveland valve, but saw no markings inside.
    Last edited by C9x; 04-29-2007 at 06:50 AM.

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