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  1. #1
    Veteran Member Three Rings evola4's Avatar
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    Sep 03 2007
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    05' Audi A4 Ultrasport
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    How to tell if you have bad check valve

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    How do you know if you have a bad check valve, I've looked at all my check valves that I could see and they all look ok, no cracks or anything of that sort. Is there another way to tell. Same question goes for the gas cap as well. How would I know if I have a bad one.
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  2. #2
    Veteran Member Four Rings dirtybrd's Avatar
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    Mar 21 2006
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    Revo Tuned 2.0L w/35r
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    Re: How to tell if you have bad check valve

    You can blow thru one way but not the other, it's good.
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  3. #3
    Veteran Member Four Rings jrau13's Avatar
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    Mar 12 2006
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    02 Mercedes ML, 04 Avant 1.8t
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    Re: How to tell if you have bad check valve

    Do a boost leak test and that should tell you as well. Gas cap, not sure.
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  4. #4
    Veteran Member Three Rings Dirty's Avatar
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    Feb 07 2008
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    Orlando, FL

    Re: How to tell if you have bad check valve

    If you have a bad gas cap you should throw a cel.
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  5. #5
    Veteran Member Three Rings evola4's Avatar
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    Sep 03 2007
    AZ Member #
    20784
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    05' Audi A4 Ultrasport
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    henderson, nv

    Re: How to tell if you have bad check valve

    cool thanks
    WTB K04 turbo ASAP


    http://etektuning.com

  6. #6
    Established Member Four Rings A4TL's Avatar
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    Nov 06 2006
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    335is
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    atlanta

    Re: How to tell if you have bad check valve

    the thermoset plastic will be crumbling away. this in turn gets stuck in say your N80 valve which then costs you a new check valve and n80 valve.

    I've got USP plastics $1.66 check valves all over my engine. works great.

    when i pulled the check valve off before the N80 purge valve you could see the end of the nipple facing the valve had a small chunk missing. of course i could never get it out of the n80 valve :(
    02 1.8tqs - apr 1+ - SS forge - Hartmann B5 RS4 18" ET35 - Delsa (ebay) spoiler lip - debadged, B7 A4 320mmx30 front brakes - 335i Montego Blue/black; Sport;Prem; iDrive; Step and Heated Seats.

  7. #7
    Veteran Member Four Rings AudiA4Turbo22's Avatar
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    Dec 06 2007
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    '03 Audi A4 1.8TQ Tip, '10 Mbz E550
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    Re: How to tell if you have bad check valve

    sorry for the thread jack, but how would u know ur n80 is bad??
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    BetaAlphaTau Member #58

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  8. #8
    Veteran Member Four Rings BOPOH's Avatar
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    Oct 08 2007
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    Columbus, OH

    Re: How to tell if you have bad check valve

    Quote Originally Posted by A4TL View Post

    I've got USP plastics $1.66 check valves all over my engine. works great.
    sorry to jack thread but where did you find that?

  9. #9
    Veteran Member Four Rings HIERLEVELZ's Avatar
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    Apr 16 2007
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    17316
    Location
    Queens

    Re: How to tell if you have bad check valve

    Quote Originally Posted by A4TL View Post
    the thermoset plastic will be crumbling away. this in turn gets stuck in say your N80 valve which then costs you a new check valve and n80 valve.

    I've got USP plastics $1.66 check valves all over my engine. works great.

    when i pulled the check valve off before the N80 purge valve you could see the end of the nipple facing the valve had a small chunk missing. of course i could never get it out of the n80 valve :(
    Which of the following is the appropriate size?

    http://www.usplastic.com/catalog/pro...uct%5Fid=15641
    BetaAlphaTau Member # 31
    2003 A4 1.8TQM

  10. #10
    Established Member Four Rings A4TL's Avatar
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    Nov 06 2006
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    13172
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    335is
    Location
    atlanta

    Re: How to tell if you have bad check valve

    well there are actually a few different sizes :) and at lease one is a multi-function valve which would require two check valves .

    I just bought a handful of them because they come in handy.


    n80 is easy to check..

    i used a 9.6 to 12V power supply with the bare wire (cut the end off) .

    when there is no power you can not blow/suck anything through the. tight seal.

    then you apply the power (don't worry about neg/positive you'll get it right). and it shold flow smoothly in both directions.

    there's even a screwdriver to adjust it but i strongly suggest you don't do that unless you know what you are doing.

    feel free to clean it. i tried everything on the planet but mine was jammed open a little and no matter what it was leaking air with no power; thus evap leak , mushy brakes, poor mpg, hard starts,etc.

    there's a big pump in the back of the car that creates alot of vacuum. if you have the desire, replace the N80 with a straw (cut it down) and you'll see misfires galore and a sputtering engine. There's enough vacuum coming from the back of the car to stall the motor if the n80 malfunctioned and flowed 100%.

    the n80 goes down the wheel well then back the rear of the car where this vacuum pump is located.

    automatic cars have another pump of course in the engine bay. i assumed it was for brake assist or something like that.
    02 1.8tqs - apr 1+ - SS forge - Hartmann B5 RS4 18" ET35 - Delsa (ebay) spoiler lip - debadged, B7 A4 320mmx30 front brakes - 335i Montego Blue/black; Sport;Prem; iDrive; Step and Heated Seats.



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