1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Hissing sound when accelerating

colej Feb 8, 2010

  1. colej

    colej New Member

    1
    0
    1
    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
     
  2. sulaiman

    sulaiman Member

    274
    1
    16
    Sounds like the turbo boosting which you should be very happy of. lol
     
  3. MIKE GTR

    MIKE GTR Member

    366
    1
    16
    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
     
  4. kitpayne

    kitpayne Member

    129
    0
    16
    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!!
     
  5. jdas03

    jdas03 Member

    603
    2
    18
    I get that on mine all the time presume just the turbo, since i have owned thr car its made that hissing noise
     
  6. martin1

    martin1 New Member

    1
    0
    1
    well i don't know about anyone but i like this hissing sound :p
     
  7. Welly

    Welly VX220 SC Driver :)

    10,696
    130
    38
    It's got boost leak written all over it.....
     
  8. lee111s

    lee111s Member

    54
    3
    8
    Are you sure it's not just the turbo sucky noise :D
     
  9. Welly

    Welly VX220 SC Driver :)

    10,696
    130
    38
    That's not really a hiss though, more of a whine....

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

    sportstractor Chugger

    2,709
    36
    48
    any major leak will be quite obvious on performance and MPG.

    Boost leaks aare a ******** 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.
     
  11. Welly

    Welly VX220 SC Driver :)

    10,696
    130
    38
    Tell me about it, I'm still hunting them down at the moment, after fitting the intercooler 2 months ago!
     
  12. gewagon

    gewagon New Member

    3
    0
    1
    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 ?
     
  13. Dazboss

    Dazboss Like A Thristy Dingo ;)

    366
    0
    16
    Mine does the same :-s
     
  14. jwb7

    jwb7 New Member

    3
    0
    1
    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
     
  15. gewagon

    gewagon New Member

    3
    0
    1
    anybody have any idea what this problem is ?
     
  16. Mr.Blonde

    Mr.Blonde Member

    443
    0
    16
    Whats the smoke test??...
     
  17. shanejess

    shanejess Guest

    0
    0
    0
    if your tyre is now flat it was a puncture nothing to worry about.
     
  18. jwb7

    jwb7 New Member

    3
    0
    1
    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
     

Share This Page