Engine Drivetrain 1st Gen Cooper S Most liked posts in thread: Inconsistant Boost?

  1. sirhc

    sirhc New Member

    Feb 11, 2011
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    #2 sirhc, Feb 14, 2011
    my guess is bypass valve may be starting to leak
     
  2. wzabrouski

    wzabrouski Active Member

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    #3 wzabrouski, Feb 14, 2011
    I put in a DT bypass valve less than a year ago. Would it fail this soon?
     
  3. sirhc

    sirhc New Member

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    #4 sirhc, Feb 14, 2011
    it shouldnt have but anything is possible.have you checked your intercooler boots? or maybe your tensioner belt is slipping. so check the belt and the tensioner
     
  4. Nitrominis

    Nitrominis Banned

    May 9, 2009
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    #5 Nitrominis, Feb 14, 2011
    what are you using to determine the boost and the rpm range?

    The unusual behavior you describe does not sound of the normal suspects.
     
  5. wzabrouski

    wzabrouski Active Member

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    #6 wzabrouski, Feb 15, 2011
    Boost gauge and looking at the speedo. Belt is new within 3k.
     
  6. BThayer23

    BThayer23 Well-Known Member

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    #7 BThayer23, Feb 15, 2011
    Auto or manual trans?

    And what year is your car? Sometimes the 05-06 cars don't like the DT bypass valve.
     
  7. wzabrouski

    wzabrouski Active Member

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    #8 wzabrouski, Feb 15, 2011
    2006 auto
     
  8. BThayer23

    BThayer23 Well-Known Member

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    #9 BThayer23, Feb 15, 2011
    Ditch the DT bypass valve and see if that helps.

    Otherwise PM BlimeyCabrio. He's got an 06 auto and knows all there is to know about intermittent boost problems, bypass valves, and the R53 auto tranny.
     
  9. wzabrouski

    wzabrouski Active Member

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    #10 wzabrouski, Feb 16, 2011
    Just wondering why it is all of a sudden an issue when i have had it over a year.
     
  10. minimark

    minimark Well-Known Member

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    #11 minimark, Feb 16, 2011
    Get a smoke test done and see if you have any leaks, then go from there. 2cents
     
  11. BThayer23

    BThayer23 Well-Known Member

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    #12 BThayer23, Feb 16, 2011
    Yeah, that's another good thought. Sometimes the intercooler boots develop cracks and holes, too.