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  1. #1
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    Hissing sound when accelerating

    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. #2
    sulaiman's Avatar
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    Sounds like the turbo boosting which you should be very happy of. lol

    A3 TDI Sport

  4. #3
    MIKE GTR's Avatar
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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. #4
    kitpayne's Avatar
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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. #5
    jdas03's Avatar
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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. #6
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    well i don't know about anyone but i like this hissing sound :P

  8. #7
    Welly's Avatar
    Testing dodgy Chinese gear...

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    It's got boost leak written all over it.....
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    Quote Originally Posted by Prawn View Post
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  9. #8
    Neutral

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

  10. #9
    Welly's Avatar
    Testing dodgy Chinese gear...

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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!
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    "Marriage is like a coffin and each kid is another nail."
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    Quote Originally Posted by Prawn View Post
    Wellyboots, you are quite literally my most favourite pikey in the entire world




  11. #10
    Chugger

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

    Boost leaks aare a *******s 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.
    57 A3 2.0 TDI Sportback (140)

  12. #11
    Welly's Avatar
    Testing dodgy Chinese gear...

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    Tell me about it, I'm still hunting them down at the moment, after fitting the intercooler 2 months ago!
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    "Marriage is like a coffin and each kid is another nail."
    Homer Simpson

    Quote Originally Posted by Prawn View Post
    Wellyboots, you are quite literally my most favourite pikey in the entire world




  13. #12
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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. #13
    Dazboss's Avatar
    Like A Thristy Dingo ;)

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    Mine does the same :-s
    Audi A3 Quattro Sport 180bhp

    Pic's comimng soon !

  15. #14
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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. #15
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    anybody have any idea what this problem is ?

  17. #16
    steviet's Avatar
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    Whats the smoke test??...

    A3 1.8 TURBO| RS6 18INCH ALLOYS | FORGE 007 | SMOOTHED O/E BOX WITH COLD AIR FEED | COILOVERS | MOTECH RE-MAP | FULL CREAM LEATHER | FORGE DV RELOCATION | FORGE TIP HOSE|SILICONE BOOST HOSES|REMOVED REAR WIPER|G60 FLYWHEEL & VR6 CLUCTH|MILTEK CAT BACK DISCREET SYSTEM|312MM BRAKE UPGRADE|UPRATED DOG BONE MOUNT.

  18. #17
    shanejess
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    if your tyre is now flat it was a puncture nothing to worry about.

  19. #18
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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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