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  1. #1
    Active Member One Ring BarryBadgernath's Avatar
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    Apr 29 2017
    AZ Member #
    398633
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    toledo

    Vacuum connector

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    So I noticed this while looking through my engine bay today. A sensor with three spots that it looks like vacuum lines should connect to. Found it behind the MAF housing. Can anybody tell me what exactly this is and is it bad that there is nothing connected to it? IMG_20180614_123418.jpeg

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  2. #2
    Veteran Member Four Rings xalents23's Avatar
    Join Date
    Oct 26 2011
    AZ Member #
    83081
    Location
    CA

    That's your N75 valve it controls when and how far to open the wastegate to allow boost pressure to be released. Your wastegate lines are supposed to be connected to this.
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  3. #3
    Veteran Member Four Rings FlyboyS4's Avatar
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    Jan 06 2007
    AZ Member #
    14660
    My Garage
    2001 S4, 2004 MSM MX-5
    Location
    FL

    Quote Originally Posted by BarryBadgernath View Post
    is it bad that there is nothing connected to it?
    Do you have an MBC or some other form of boost control?
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  4. #4
    Veteran Member Four Rings CELison's Avatar
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    Feb 23 2010
    AZ Member #
    55053
    Location
    Lehigh Valley

    Um..... guessing you must have a mbc?

  5. #5
    Established Member Two Rings sxC's Avatar
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    Feb 12 2013
    AZ Member #
    109439
    My Garage
    2000 S4, 2012 S5
    Location
    Houston, TX

    Are you tuned? If not you'd be throwing a CEL and not boosting... limp mode

  6. #6
    Active Member One Ring BarryBadgernath's Avatar
    Join Date
    Apr 29 2017
    AZ Member #
    398633
    Location
    toledo

    Yeah I have a mbc, realizing now that it is the old boost solenoid just freaked out there for a minute without thinking it through properly.

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  7. #7
    Veteran Member Four Rings CELison's Avatar
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    Feb 23 2010
    AZ Member #
    55053
    Location
    Lehigh Valley

    Mbc is a band aid for an incompetent tuner. I highly suggest getting a tune using the n75.

  8. #8
    Active Member One Ring BarryBadgernath's Avatar
    Join Date
    Apr 29 2017
    AZ Member #
    398633
    Location
    toledo

    Alright thanks for the helpful info

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