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      01-29-2011, 12:23 AM   #1
scott135i
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Moaning Noise coming from N54 Engine (On and off...) What could it be??

Please check out the video below. It is from tonight, from my mother's 2008 135i with 22k on the odometer... . I pulled over to hear what the noise was, popped the hood, and heard the noises.... WTF could it be? Something common or obvious? There is no check engine light on, and the car seems to be running perfectly.

I need to check for codes later this weekend...

Experts.... anything?





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Last edited by scott135i; 01-29-2011 at 12:27 AM. Reason: Link added... video embedded
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      01-29-2011, 12:24 AM   #2
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Vid embedded above...
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Last edited by scott135i; 01-29-2011 at 12:31 AM.
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      01-29-2011, 12:28 AM   #3
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Quote:
Originally Posted by scott135i View Post
Can anyone see the vid?
vid works fine. I'm not sure what that sound is though. But I am sure someone here with loads of experience will likely know the cause.
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      01-29-2011, 12:36 AM   #4
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Hmmm never heard that sound before from any N54. If I had to guess since it seems to be coming from the exhaust side is maybe a pinched or leaking vacuum line leading to the solenoid for the wastegates since that was what you were pointing to. Just my guess.
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      01-29-2011, 12:39 AM   #5
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Sounds like it was coming from that general area, but I couldn't tell exactly where....
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      01-29-2011, 12:47 AM   #6
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      01-29-2011, 04:37 AM   #7
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Solenoid might be on its way out. Take it to your dealer
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      01-31-2011, 11:52 AM   #8
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I would say take it to the dealer as probably none of us can really diagnose your problem by watching that video.

-Frank
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      01-31-2011, 05:02 PM   #9
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Going in on friday... just was looking for feedback from someone if they had a similar noise/issues...
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      01-31-2011, 05:19 PM   #10
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DAMN!
If you keep saying that Mo, you better bring free RedBull.
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      01-31-2011, 05:43 PM   #11
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turbo empeller free spinning or bad bearing in the turbo. hope not
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      01-31-2011, 06:14 PM   #12
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Is the sound still there when you rev it up a little, does it change at all (pitch) or remain constant? From the title of the thread it sounds like it's not RPM dependent which would rule out anything mechanical inside the turbo, sans wastegate.
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      01-31-2011, 08:20 PM   #13
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I love how you give the engine cover some 'technical whacks'

No idea OP, never heard something like that before. Good luck at the dealer!
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      04-11-2011, 10:19 PM   #14
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SOLVED....

Details from worksheet:
Faulty Pressure Converter
Duplicated Noise. Found coming from 2nd pressure converter.
Checked all vacuum hoses for leaks. All okay. Replaced pressure converter and tested. Noise Gone.

PRESSURE CONVERTER Part #11747595374
-It is part of the 'vacuum control system'
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      04-12-2011, 01:50 AM   #15
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I get a moaning noise too but mine is inside the car and only there when the wife is in the car with me......
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      04-12-2011, 08:41 AM   #16
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^^^^
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      04-12-2011, 11:37 AM   #17
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I would have guessed a kitten purring..guess i wouldve been wrong
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