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2G Bov opening under acceleration

Posted by JuGs, Mar 20, 2017

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  1. JuGs

    JuGs Proven Member

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    Joined Jul 20, 2008
    Marshall, Wisconsin
    Ok so what can cause my bov to open while accelerating? I know it shouldn't open unless let off throttle.

    Its a 1g bov all hard ic pipes. 16g turbo.
     

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  2. ec17pse

    ec17pse Freelancer

    2,256
    456
    Joined Nov 1, 2008
    London, Europe
    Seems like the spring is weak, have you tested it to see when it starts to open as you may need a new bov
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    Road Race Build

    175 whp   180.1 lb/ft
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  3. jakk220

    jakk220 Proven Member

    667
    70
    Joined Nov 13, 2010
    Stow, Ohio
    I second that. Sounds like you need a new blow off valve. You could be over running it or its just old.
     
    My DSM:
    1993 Mitsubishi Eclipse GSX

    Street Build

    16g   manual
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  4. doubleclutch

    doubleclutch Supporting Member

    551
    102
    Joined Jun 26, 2009
    Canton, Michigan
    You could "crush" it. Increase the spring preload to help it stay shut.
     
    My DSM:
    1998 Mitsubishi Eclipse GSX

    Street Build

    16g   manual
    1996 Mitsubishi Eclipse GST (sold)

    T25   manual
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  5. JuGs

    JuGs Proven Member

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    Joined Jul 20, 2008
    Marshall, Wisconsin
    I was actually going to try that. Or buy the NGR type greddy rep one.

    It opens after 3500 rpms or after a few lbs of boost.
     
  6. tametalon92

    tametalon92 Proven Member

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    204
    Joined Jan 5, 2012
    spokane, Washington
    How is your vacuum line routed to the bov?
     
    My DSM:
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  7. JuGs

    JuGs Proven Member

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    Joined Jul 20, 2008
    Marshall, Wisconsin

    Yes. Straight to the intake. I've replacedthe line as well with new. Still does it.
     
  8. tametalon92

    tametalon92 Proven Member

    1,207
    204
    Joined Jan 5, 2012
    spokane, Washington
    I assume you mean intake manifold. If that's the case, then yes it would seem the spring is weak.
     
    My DSM:
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  9. JuGs

    JuGs Proven Member

    590
    0
    Joined Jul 20, 2008
    Marshall, Wisconsin

    Yes the intake manifold.
     

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