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High pitched whine under load

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Old 03-19-2018, 02:46 PM
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kalanioc
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Default High pitched whine under load
New here - I have a 2009 C4S 6 speed that I've just recently noticed a distinct extremely high pitched whine coming from the rear when the engine is under load - noticeable around 3500 rpm. The sound is rpm dependent and gets more intense as the rpms climb. Car drives just fine.

what could it be???
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Old 03-19-2018, 03:06 PM
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bmwfan328
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any shifter cable, transmission mount, or engine mount mods?
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Old 03-19-2018, 03:13 PM
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kalanioc
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Originally Posted by bmwfan328
any shifter cable, transmission mount, or engine mount mods?
none that I am aware of.
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Old 03-19-2018, 03:55 PM
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lowbee
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check water pump, belts etc...
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Old 03-19-2018, 04:52 PM
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cosm3os
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Supercharger
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Old 03-19-2018, 05:04 PM
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Originally Posted by cosm3os
Supercharger


sounds like one!
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Old 03-19-2018, 06:06 PM
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bmwfan328
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has this noise been present since you've owned it, or is this a new development?
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Old 03-19-2018, 06:27 PM
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kalanioc
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Originally Posted by bmwfan328
has this noise been present since you've owned it, or is this a new development?
just noticed it last night. However, it was about 20 degrees out and icy. Hasn't been that cold since owning the car. I will bring it in to a shop to get it checked out.
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Old 03-19-2018, 06:33 PM
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Originally Posted by lowbee
check water pump, belts etc...
Agree. Add rear wheel bearing to list.
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Old 03-19-2018, 09:06 PM
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Wayne Smith
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I get a high pitched rpm based whine from my speakers if I'm using the Aux input and have no device attached.
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Old 03-19-2018, 09:14 PM
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Originally Posted by Wayne Smith
I get a high pitched rpm based whine from my speakers if I'm using the Aux input and have no device attached.
!!!!!!!
I have exactly that situation. I'm gonna go take it off and see if it goes away.
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Old 03-19-2018, 09:23 PM
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Originally Posted by Wayne Smith
I get a high pitched rpm based whine from my speakers if I'm using the Aux input and have no device attached.
Unplugged the aux cable and the whine is gone. Thank you so much!!!
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Old 03-20-2018, 10:20 AM
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JABowders
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I suffered for years with a brain numbing, maddening whine that was draining my soul ... I divorced her and bought a Porsche.
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Old 03-20-2018, 11:13 AM
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Mike Murphy
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Believe it or not, I can hear that same whine when i have my wireless air pods in my ears. Now go figure that one out!
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Old 03-20-2018, 11:54 AM
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DC911S
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Power steering pump possibly, I bet you need to top it off. When I got my 2009 two years ago, I had a whine, besides my GF in the car, and I checked the PS reservoir. Yup, it was low. I bought some at Suncoast, I used a baster to suck out the old fluid and added new fluid in. Turned the wheel a few times to get rid of the air, and no problems since.
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