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Hissing sound when accelerating

Discussion in 'A3/S3 Forum (8L Chassis)' started by colej, Feb 8, 2010.

  1. colej

    colej New Member

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    Hi

    This question may have been answered before, as found some threads concerning it on the a4 forum but nothing on the a3 forum.

    Just bought a 2001 audi a3 1.9Tdi and have noticed when accelerating it makes a hissing sound. This is audible when you have the window down. It seems to happens at low rpm (about 1500-2500), it does not seem to happen when idling or when just revving the engine. Is it meant to make this noise?

    Any help would be appreciated. Thanks
     
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  3. sulaiman

    sulaiman Member

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    Sounds like the turbo boosting which you should be very happy of. lol
     
  4. MIKE GTR

    MIKE GTR Member

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    I know this sound, i had it on mine, it sounds like air escaping. Do the normal checks on all boost pipes etc - I could never find mine
     
  5. kitpayne

    kitpayne Member

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    I had a 1.9tdi passat which made the same noise. it ended up being a straight piece of rubber pipe near the turbo somewhere. not sure which pipe though!!
     
  6. jdas03

    jdas03 Member

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    I get that on mine all the time presume just the turbo, since i have owned thr car its made that hissing noise
     
  7. martin1

    martin1 New Member

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    well i don't know about anyone but i like this hissing sound :p
     
  8. Welly

    Welly VX220 SC Driver :)

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    It's got boost leak written all over it.....
     
  9. lee111s

    lee111s Member

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    Are you sure it's not just the turbo sucky noise :D
     
  10. Welly

    Welly VX220 SC Driver :)

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    That's not really a hiss though, more of a whine....

    Bottom line here is that the facts are a bit sparse!
     
  11. sportstractor

    sportstractor Chugger

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    any major leak will be quite obvious on performance and MPG.

    Boost leaks aare a bastards fiind, just a massive process of elimination. I took mine for a smoke test and they found a little leak, still managed to find another leak afterward.
     
  12. Welly

    Welly VX220 SC Driver :)

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    Tell me about it, I'm still hunting them down at the moment, after fitting the intercooler 2 months ago!
     
  13. gewagon

    gewagon New Member

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    Hi I have an Audi 1.9tdi 05 driving it the other day heard a slight pop and then the turbo has a loud whining/hissing noise , when I took of the wastegate acuator pipe (vacume) the noise stopped but lack of turbo power when I put the pipe back on I had full turbo power but the whining turbo spinning noise like the wastegate is constantly open , could this be the N75 Solinoid valve or an air leak somewhere I dont think the turbo is at fault as it is not rumbling or rattleling or like a bearing whine just the spinning noise of the turbo ?
     
  14. Dazboss

    Dazboss Like A Thristy Dingo ;)

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    Mine does the same :-s
     
  15. jwb7

    jwb7 New Member

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    Hi
    Just got an A4 1.9 tdi 98 s plate and i too have this bloody anoying high pitched whining noise, and when I remove the small pipe from the vacuum unit it stops, anybody replaced this N75 valve there talking about and did it stop the noise? I have checked the turbo fan and there doesn't seem to be any free play or looseness there
     
  16. gewagon

    gewagon New Member

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    anybody have any idea what this problem is ?
     
  17. steviet

    steviet Member

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    Whats the smoke test??...
     
  18. shanejess

    shanejess Guest

    if your tyre is now flat it was a puncture nothing to worry about.
     
  19. jwb7

    jwb7 New Member

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    Took my A4 to an Audi mechanic yesterday and he says it's normal turbo noise,, well pleased as I thought major expense on the way
     

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