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I don't know what it's called?!!!

Discussion in 'A4/S4 forum(B5 Chassis)' started by NATE6874, Jan 12, 2011.

  1. NATE6874
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    NATE6874 Member

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    [Jan 12, 2011]
    Can anyone tell me what the small solenoid on top of the airbox is called on a 1.8t AEB engine form a 1997 A4?
    Mines seems to be ticking/clicking. I was told it's called a charcoal filter and has something to do with fuel.
    Many thanks
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  3. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jan 12, 2011]
    N80 valve, it's supposed to click, this indicates it's working
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  4. NATE6874
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    NATE6874 Member

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    [Jan 12, 2011]
    so the n80 sits on top of the airbox? whats its purpose?
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  5. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jan 12, 2011]
    connects the fuel tank vent pipe (which comes via the charcoal filter) to the inlet manifold.
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  6. NATE6874
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    [Jan 12, 2011]
    oh okay, I read in a thread somewhere that they can become blocked and can make the idle a bit rough. whats th best way of cleaning it out?
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  7. phoenixv6quattro
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    phoenixv6quattro staylowmovefast

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    [Jan 13, 2011]
    I put mine in the dishwasher LOL! Then thorughly dried it out. Works fine! Loud, audible and crisp clicking! I do this to a lot of engine/car parts much to my mrs annoyance-fu*k it, its only a "pro-line" dishwasher!
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  8. pjw
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    [Jan 13, 2011]
    its the vacuum control valve / vent valve i think. ill be putting mine through the dishwasher tonight.
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  9. NATE6874
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    NATE6874 Member

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    [Jan 13, 2011]
    Right, well I removed it, cleaned it, dried it. still the same clicking. Idle still wobbly especially when at junctions and preesing the clutch... what now?
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  10. phoenixv6quattro
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    phoenixv6quattro staylowmovefast

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    [Jan 13, 2011]
    Do the 1.8t engines have an idle control valve? If so might be worth removing it and giving it a good clean. If not, then it could be a few things. You could have a vacum pipe/breather pipe leak somewhere. It could be a faulty TB (This was the case on mine - 2.8) it could be a buggered wire like the one on geemans a while back, it could be anything breathing realted......Your best bet is to vagcom scan then the process of elimination.
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  11. NATE6874
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    [Jan 13, 2011]
    Cheers for the info. I have already run a vagcom scan... no error codes! Where would the idle control valve be? also whats a TB? I'm not really up on all the tech speak yet.
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  12. Oranoco
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    Oranoco Well-Known Member

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    [Jan 13, 2011]
    Get some electrical contact cleaner and give the MAF a good clean then ensure it's properly dry before running the car. Cured my dodgy idle :)
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  13. pjw
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    pjw Member

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    [Jan 13, 2011]
    If you have VAGCOM you can view what the MAF is reading in the engine section, although im not sure what it should say so its kind of useless to me.


    Mines doing exactly the same as yours. Have you got pisspoor MPG too? Mine has a new MAF, and a vagcom scan shows nothing. However, that valve your on about isnt ticking.

    I also did a throttlebody alignment and it didnt cure it.
    Last edited: Jan 13, 2011
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  14. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jan 13, 2011]
    To easily test the N80, loosen the fuel cap and go for a drive, if the car behaves, the n80 isnt venting properly.

    If it's still **** MAF, Crank sensor etc etc etc
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