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335i noise: turbo-ish but not #4669635
02/18/18 11:23 AM
02/18/18 11:23 AM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline OP
Alex_V  Offline OP
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Trying to locate a noise on an '07 BMW 335i. Twin turbo/DI N54 3.0L, 123K. I'd almost think it's some of the turbo piping come loose, but it doesn't fluctuate quite like I think the turbos should. Not directly related to engine, vehicle, or cooling fan speed, either - sounds like it's coming from toward the back of the engine. Car has decent power but seems to get gradually weaker above 2,500 RPM (I'd think the TT six should really be hauling tail about that time) and the limp mode light (symbol of an engine sliced in half) comes on when it gets up close to 4,000. No CEL. Ideas?

https://youtu.be/Nf7Kugf9CxQ
https://youtu.be/uwu1ZYcwTnM

Last edited by Alex_V; 02/18/18 11:25 AM.

To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: 335i noise: turbo-ish but not [Re: Alex_V] #4669639
02/18/18 11:24 AM
02/18/18 11:24 AM
Joined: Nov 2011
Posts: 1,325
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,325
Lyndhurst NJ
Boost leak, wastegates failling or out of adjustment, vacuum lines going to vac canisters could be broken.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: 335i noise: turbo-ish but not [Re: Alex_V] #4669795
02/18/18 01:31 PM
02/18/18 01:31 PM
Joined: Jul 2002
Posts: 4,608
KY
MCompact Offline
MCompact  Offline
Joined: Jul 2002
Posts: 4,608
KY
Check for boost/vacuum leaks first, but I suspect it's a wastegate issue...


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i M Sport


Son's
2009 328i

Buy what makes you smile...
Re: 335i noise: turbo-ish but not [Re: Alex_V] #4669848
02/18/18 02:43 PM
02/18/18 02:43 PM
Joined: Sep 2007
Posts: 8,598
Florida
artificialist Offline
artificialist  Offline
Joined: Sep 2007
Posts: 8,598
Florida
VW uses something called an "N75 Valve" so that the computer can open and close the wastegate or VNT nozzle with turbo boost pressure. I am sure you BMW uses something identical, but is named differently.

When the engine is off boost, spray carb cleaner around the intake manifold. If the intake gasket has failed, some of the carb cleaner will get sucked in and change the way the engine runs. It is a common problem on the Dodge SRT-4.


2010 Lancer Ralliart Sportback
Re: 335i noise: turbo-ish but not [Re: Alex_V] #4669856
02/18/18 02:48 PM
02/18/18 02:48 PM
Joined: Nov 2011
Posts: 1,325
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,325
Lyndhurst NJ
There was a huge recall on these early ones for wastegate issues, Id check to make sure everything has been updated.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40

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