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Strange Noise - Sounds like BOV

Discussion in 'A4/S4 forum(B5 Chassis)' started by godwine, May 15, 2004.

  1. godwine
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    godwine Member

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    Here is my little problem. My 2000 1.8T is stock (North American model, 150hp), no mods at all. When I was driving home earlier, I notice a strange noise, its not the standard whining noise from the turbo, but instead, it sounded more like exhaust noise.. when I release the gas, I heard a light hissing noise, something similar to BOV noise... is it coming from my stock DV? Should I be worry about it?
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  2. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    What is BOV noise?
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  3. Mutinyno9
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    Mutinyno9 Member

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    I'm only guessing(hearing an eclipse GST) but when you rev up the engine and let go of the throttle, it makes like a "woooo-cheee" noise, besides that i don't know
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  4. Markey
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    Markey Active Member

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    there will be a slight noise as the air is being channeled back under pressure into the air box, which on some models can be heard more than normal. The turbo can also whistle a little bit, which it might be.
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  5. ImolaS4
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    ImolaS4 Member

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    I'd listen to it with the hood up and a friend revving the engine. It may very well be a bad DV or a leaking hose.
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  6. godwine
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    godwine Member

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    I never heard this when I first got the car 4 years ago (as new).. so I am sure soemthing either worn out or is broken.. thanks, I will get someone to rev it up with me listening inside the hood.. if its a bad DV, how much would it cost to get it replaced ?:(
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  7. Markey
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    Markey Active Member

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    if you wanted an after market one which last a lot longer they are about 90GBP for a gooden. not sure how much the oem ones are new but i have seen them on ebay going for about 30GBP
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  8. ImolaS4
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    ImolaS4 Member

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    [ QUOTE ]
    godwine said:
    I never heard this when I first got the car 4 years ago (as new).. so I am sure soemthing either worn out or is broken.. thanks, I will get someone to rev it up with me listening inside the hood.. if its a bad DV, how much would it cost to get it replaced ?:(

    [/ QUOTE ]

    DV's:
    Bailey = Probably the most popular, serviceable, $$$
    Forge = Large (some reported fitment issues), serviceable, $$
    Forge Race = Larger than others, adjustable, serviceable, $$$
    Hyperboost = Cosmetic package, not serviceable, $$
    Hyperboost Adjustable = New, cosmetic package, may not fit S4, adjustable preload, not serviceable, $$$
    Hyperboost HX = Newest, very cosmetic package, new internals, not serviceable, $$$
    OE Bosch 710N = Basic upgrade, popular with budget-minded modders, not serviceable, $
    OE Bosch Sport 110 = MTM upgrade, same as 710N with "better" internals, $$

    $ = under $50 USD
    $$ = $50 - $150 USD
    $$$ = Over $150 USD

    <font color="red">Don't forget to check your TBB and the small hoses coming off the DV's, too. </font>
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  9. godwine
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    godwine Member

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    thanks guys, i will let you guys know what my findings are
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  10. godwine
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    godwine Member

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    Its a real strange noise, and I seems to be burning gas more than usual.. made an appointment to have it looked at next week /ubbthreads/images/graemlins/frown.gif
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  11. godwine
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    godwine Member

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    So, ontop of this problem, all my locks failed too... the damn connection to the lock pump was gone.. they got me a new pump.. so anyways,apparently this problem was due to a bad BOV.. wow.. I didn't know that the stock A4 comes with BOV.. news to me, but the dealer's advisor ensure that it is a BOV i have, not a DV... can someone PLEASE tell me if its a BOV or DV in the stock 1.8T? Maybe I should start studying the Audi A4 again from beginning?
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