High Pitch squealing sound BMW e90 2011, How to Fix it?

moneybimmer · 11-20-2017, 06:43 PM

Please help me fix this sound happens sometimes after car runs for around 30 minutes , its really loud. I have replaced the serpentine belt also but no luck.
Its 2011 e90 328xi with 50k
here is the video i recorded https://www.youtube.com/watch?v=OFb1Mt_8H08

MysticRob · 11-20-2017, 07:36 PM

It's not a belt sound so replacing that wouldn't have done any good anyway. Sounds like a pulley. Shoot some lubricant on each suspected pulley one at a time prior to startup and see if it eliminates or changes the sound (careful not to spray the belt, etc). If it does, then you've discovered which pulley it is and can go from there.

moneybimmer · 11-20-2017, 07:40 PM

found similar noise on YouTube https://www.youtube.com/watch?v=Rdf7847n-pU if you read the comment on video it points out to faulty valve cover, m confused if i have the same problem or not

hzhn · 11-21-2017, 12:57 AM

Open the engine oil cap and if the sound is gone then it's the PCV valve. Happened to me on N55 but not sure if N52 has the same problem.

robthewrench · 11-21-2017, 07:03 AM

Quote:

Originally Posted by hzhn

Open the engine oil cap and if the sound is gone then it's the PCV valve. Happened to me on N55 but not sure if N52 has the same problem.

This is the correct way to test for the clogged PCV built into the valve cover.

11-20-2017, 06:43 PM	#1
moneybimmer BMW is life 2 Rep 6 Posts Drives: 2011 BMW 328Xi Join Date: Nov 2017 Location: Winnipeg iTrader: (0) Garage List 2011 BMW 328xi [10.00]	High Pitch squealing sound BMW e90 2011, How to Fix it? Please help me fix this sound happens sometimes after car runs for around 30 minutes , its really loud. I have replaced the serpentine belt also but no luck. Its 2011 e90 328xi with 50k here is the video i recorded https://www.youtube.com/watch?v=OFb1Mt_8H08 __________________ BMW is life
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11-20-2017, 07:36 PM	#2
MysticRob Captain 573 Rep 870 Posts Drives: 2009 335i E90 Join Date: Jan 2017 Location: Fremont, CA iTrader: (0) Garage List 2009 BMW 335i E90 S ... [10.00]	It's not a belt sound so replacing that wouldn't have done any good anyway. Sounds like a pulley. Shoot some lubricant on each suspected pulley one at a time prior to startup and see if it eliminates or changes the sound (careful not to spray the belt, etc). If it does, then you've discovered which pulley it is and can go from there. __________________ 2008 E61 535xi Sport Wagon / 100k Miles / Deep Sea Blue Metallic / Natural Brown Interior / MHD Stage 1 91 CA-Octane Tune. SOLD - 2009 E90 335i M-Sport Sedan / 143k Miles / Alpine White Exterior / Chestnut Brown Interior / Mishimoto FMIC / xHP Stage 2.
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11-20-2017, 07:40 PM	#3
moneybimmer BMW is life 2 Rep 6 Posts Drives: 2011 BMW 328Xi Join Date: Nov 2017 Location: Winnipeg iTrader: (0) Garage List 2011 BMW 328xi [10.00]	found similar noise on YouTube https://www.youtube.com/watch?v=Rdf7847n-pU if you read the comment on video it points out to faulty valve cover, m confused if i have the same problem or not __________________ BMW is life
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11-21-2017, 12:57 AM	#4
hzhn Enlisted Member 13 Rep 39 Posts Drives: 2011 E90 335i AT Join Date: May 2016 Location: SoCal iTrader: (0)	Open the engine oil cap and if the sound is gone then it's the PCV valve. Happened to me on N55 but not sure if N52 has the same problem.
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