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  1. #1
    Registered Member Two Rings
    Join Date
    Aug 03 2004
    AZ Member #
    3000
    My Garage
    2007 Ibis White A4 2.0T 6spd
    Location
    fullerton, ca

    HOW would you know if your stock bypass valve went bad?

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    ya.. i was wondering that.. my car makes a weird sound when i start the engine.. like a booooooooop sound. and i can duplicate it sometimes when i raise like two windows up at once.. (like press the window buttons simultaneously..) my friend has the exact same car.. same year.. diff color.. and his doesnt do it at all.. so i know something is up... i only got like 5k on my car now.. and am about to take it to the dealer soon for the 5k checkup... just want to make sure they dont give me a dumb answer about it.. oh ya its been doing that since i had the car i think.. sometimes.. it might just be me.. but i think i hear it the sound as well while im driving.. someone said it could be the bypass valve.. and i would notice through turbo leak.. but.. since i can barely even feel the turbo.. i would have no clue if i were leaking or not. thanx again.. answers would be appreciated. =)
    2007 Ibis White Audi A4 2.0T 6MT w/ S-Line Package
    -RNS-E Retrofit
    -RS4 Rear Sway Bar
    -19" RS4 Replicas

  2. #2
    Veteran Member Four Rings teutonic_blur's Avatar
    Join Date
    Feb 11 2004
    AZ Member #
    47
    Location
    Puerto Rico

    BPV failures are often accompanied by a "honking" sound coming from the engine. You would also feel a loss of power and surging (a feeling that the boost is going on and off).

    Are you chipped? BPV failures are more common in chipped cars.

    Hope this helps.
    If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut.
    Albert Einstein

    It's not that I'm afraid to die, I just don't want to be there when it happens.
    Woody Allen
    ----
    2003 A4 1.8T FWD 5M
    Revo SPS1, K&N drop-in, NGK Coppers

  3. #3
    Registered Member Two Rings
    Join Date
    Aug 03 2004
    AZ Member #
    3000
    My Garage
    2007 Ibis White A4 2.0T 6spd
    Location
    fullerton, ca

    nope.. not chipped.. stock everything still.. any other answers?
    2007 Ibis White Audi A4 2.0T 6MT w/ S-Line Package
    -RNS-E Retrofit
    -RS4 Rear Sway Bar
    -19" RS4 Replicas

  4. #4
    Veteran Member Four Rings JMG's Avatar
    Join Date
    Feb 12 2004
    AZ Member #
    281
    My Garage
    2018 M3 CS, i3 REx
    Location
    Orange County CA

    what area of the engin bay is the sound coming from?
    2022 BMW G82 ///M4 Competition X-Drive
    2021.5 VW Atlas SEL 3.6L 4Motion
    Former:
    BMW F80 M3 CS
    BMW F80 M3
    BMW I01 i3 REx
    BMW F30 340i M Sport ZTR
    Audi B7 S4 25Quattro
    Audi B5 A4

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