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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Can bad idler and belt tensioner pulleys cause 1/2 power issues and whine?



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      02-20-2017, 11:33 PM   #1
Rob Daman
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Can bad idler and belt tensioner pulleys cause 1/2 power issues and whine?

Hi all,

I took my e90 n54 to a popular shop and was told that it's due to those pulleys.

I've never heard of anything like that but I know some cars can be quirky.

They ran a smoke test to check for vacuum leaks and said none were found. I hinted towards checking the turbo inlet pipe and was told it's ok too. I checked the charge pipe and fmic hoses myself.

here's a video of the noise i'm talking about.



It used to be a quiet whine then I decided to romp on it then it got way louder and did the half power if I ever romp again.

any help is appreciated.
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      02-21-2017, 12:29 AM   #2
Chris@VargasTurboTech
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I'd do a boost leak check immediately.
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      02-21-2017, 12:42 AM   #3
Rob Daman
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that's with around psi pressure right? i told them but i guess they think they're right.

Quote:
Originally Posted by Chris@VargasTurboTech View Post
I'd do a boost leak check immediately.
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      02-21-2017, 02:17 AM   #4
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Quote:
Originally Posted by Rob Daman View Post
that's with around psi pressure right? i told them but i guess they think they're right.
Yep, generally you'll do that with at least what your peak boost target is.

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      02-21-2017, 03:37 AM   #5
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Sounds like a shot turbo to me .. Very much turbo whine.
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      02-21-2017, 01:20 PM   #6
Rob Daman
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thanks guys. i didnt think it had anything to do with pulleys. i'm going to go to another shop.
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