High Pitched Rattle from under car?

asus389 · 05-17-2015, 11:23 AM

Can anyone identify this sound? Its a high pitched rattle or maybe even a hiss that happens at idle once its been driven for a while. Its a 2011 328i 6MT RWD. Thanks.

https://www.youtube.com/watch?v=BW5-yjaaBsc

MikeyNYC · 05-17-2015, 10:25 PM

That sound you are hearing is pretty much the exact same thing I hear. I can pretty much guarantee that it is there 90% of the time. Very easy to catch in a parking lot. But yes, I did notice that I hear it more after driving for awhile.

What it sounds like to me is a bad pulley somewhere. Sounds have a tendency to travel in weird ways. Open your hood and try to see if you can confirm that it is indeed coming from the front of the car. At first I thought it was my tranny/diff making noise. Now i'm almost positive its a pulley of some sort.

I drive an 2011 with an AT.
Keep this updated, i'm very interested to see what you find.

05-17-2015, 11:23 AM	#1
asus389 Captain 68 Rep 639 Posts Drives: 11 E90 328i Join Date: Jun 2009 Location: Michigan iTrader: (0) Garage List 2011 BMW 328i [0.00]	High Pitched Rattle from under car? Can anyone identify this sound? Its a high pitched rattle or maybe even a hiss that happens at idle once its been driven for a while. Its a 2011 328i 6MT RWD. Thanks. https://www.youtube.com/watch?v=BW5-yjaaBsc Last edited by asus389; 05-17-2015 at 11:29 AM..
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05-17-2015, 10:25 PM	#2
MikeyNYC New Member 0 Rep 6 Posts Drives: 2011 BMW 3 Join Date: Jan 2015 Location: NYC iTrader: (0)	So, That sound you are hearing is pretty much the exact same thing I hear. I can pretty much guarantee that it is there 90% of the time. Very easy to catch in a parking lot. But yes, I did notice that I hear it more after driving for awhile. What it sounds like to me is a bad pulley somewhere. Sounds have a tendency to travel in weird ways. Open your hood and try to see if you can confirm that it is indeed coming from the front of the car. At first I thought it was my tranny/diff making noise. Now i'm almost positive its a pulley of some sort. I drive an 2011 with an AT. Keep this updated, i'm very interested to see what you find.
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