Intermittent strange “whining noise”

INOAHWAY · 02-20-2018, 10:52 PM

Hey everyone, hope all is well. I’m a new member here & I have a 2008 335xi. Anybody have and ideas as to what this noise is? Between 2,000-3,500rpm. Not waste gate rattle or turbo siren whine. Really not sure. Comes and goes. More often when engine is warm. Seems affected by outside temp too. My belt & pulleys squeak on cold start and lasts about 10-15 minutes, I’m replacing them next week. Is this issue related to the belt/pulleys or something else.

Thank you all for your help.

Sound clip:

INOAHWAY · 02-21-2018, 09:53 AM

Bump

nsjames · 02-21-2018, 02:41 PM

you need a mechanics stethoscope or a long screwdriver.

isolate the noise.

FWIW my n52 odd whining noise was the oil filter.
changed teh oil and put a new filter in it, no more odd whining. Filter that failed was Mann with les than 7K miles on it.

02-20-2018, 10:52 PM	#1
INOAHWAY New Member 0 Rep 6 Posts Drives: 2008 335xi Join Date: Jan 2018 Location: Long Island, NY iTrader: (0)	Intermittent strange “whining noise” Hey everyone, hope all is well. I’m a new member here & I have a 2008 335xi. Anybody have and ideas as to what this noise is? Between 2,000-3,500rpm. Not waste gate rattle or turbo siren whine. Really not sure. Comes and goes. More often when engine is warm. Seems affected by outside temp too. My belt & pulleys squeak on cold start and lasts about 10-15 minutes, I’m replacing them next week. Is this issue related to the belt/pulleys or something else. Thank you all for your help. Sound clip: Last edited by INOAHWAY; 02-20-2018 at 11:41 PM..
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02-21-2018, 09:53 AM	#2
INOAHWAY New Member 0 Rep 6 Posts Drives: 2008 335xi Join Date: Jan 2018 Location: Long Island, NY iTrader: (0)	Bump
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02-21-2018, 02:41 PM	#3
nsjames Brigadier General 2440 Rep 4,330 Posts Drives: 08 328xi Touring Join Date: May 2017 Location: ohio iTrader: (0)	you need a mechanics stethoscope or a long screwdriver. isolate the noise. FWIW my n52 odd whining noise was the oil filter. changed teh oil and put a new filter in it, no more odd whining. Filter that failed was Mann with les than 7K miles on it.
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