Question about 2001 Audi A4

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I have a 2001 a4 2.5tdi quattro sport. I have got a really loud sucking / blowing noise from somewhere near the turbo when i drive around. I have had the intercoolers and pipes checked and all appear to be ok. When i take the air filter box off the noise is really loud, The noise appears to be related to the turbo spooling up. The car has just had a new turbo fitted and the noise was there before and now after. Any ideas ?

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  • paul_hunt5 Sep 03, 2010

    I cant beleive that this noise is standard. I have removed the pipes going to the air cleaner box anyway and the noise just got really loud.

  • paul_hunt5 Sep 03, 2010

    I have already taken the car back to the place where the turbo was installed, but they have said that the turbo is working fine. Also, the noise was there before i replaced the turbo

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  • Audi Master
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To be honest without hearing it myself its difficult to diagnose ,this could be a one of them catch 22 things where you repair the obvious and it ends up something so obscure ,all i can suggest is the manifold gasket for a sucking noise if the pipes ok or the one thing that comes to mind is the valves ,they could be not seating right for whatever reason ,broken cam belt in the past with a previous owner?? cracked valve seat?? ,broken cam shaft retaining caps ?? hole in a piston crown?' sorry but without seeing it myself iam at a loss and i honestly do not think anyone can know the answer without seeing it .These engines do suffer from valve /head problems if given a good hammering trying to have a go at a jag or porsche on the motorway .

Posted on Sep 03, 2010

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  • Master
  • 1,796 Answers

HI!!

You have a leak, take the vehicle back to the place where the turbo was installed. They should be able to take care of it. warranty should cover the repair. If you mess with it, your warranty will be void.

Good Luck!!

Posted on Sep 03, 2010

  • Rene J Solis Sep 03, 2010

    Test Secondary Air Injection Selenoid Valve and Turbocharged Recirculation Valve. If need instruccions, post a comment.

  • Rene J Solis Sep 03, 2010

    Have the vehicle scanned for trouble codes, even if the Check Engine light is not ON. Keep me posted!!

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  • Audi Master
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This is the normal sound of the air admission in the turbine - it's sucked with a very high force so it makes a lot of noise. If the noise is very loud with the air filter inserted then the air pipes from the airbox to the turbo have a leak - check them and replace and refit if necessary.

Posted on Sep 02, 2010

  • Azrael SRL Sep 03, 2010

    As i said this is normal. it's the sound of the air being sucked in. You hear it really loud because you have a turbo and it sucks a lot of air thru a small opening.

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