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      08-15-2022, 03:59 PM   #1
jmeenach
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Mystery "whirring" at 40mph

For the last month or so, I have noticed a higher-pitched whirring noise coming from my car that I can't seem to diagnose. The noise is faint and can only be heard from 40 to 45mph and it only occurs when I am on the throttle. If I let off the throttle, the noise goes away. I have produced the same sound in 4th, 5th, and 6th gear (6MT), so I have ruled out a transmission-related issue. Once I accelerate beyond 45mph, the sound goes away.

Has anyone else had a similar issue? I have searched the forum multiple times and haven't been able to find a potential fix... Any help is greatly appreciated!
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      08-15-2022, 06:25 PM   #2
Redd
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Is it coming from the front or rear? Or a particular wheel?

If rear might be differential whine.
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      08-15-2022, 08:07 PM   #3
jmeenach
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Quote:
Originally Posted by Redd View Post
Is it coming from the front or rear? Or a particular wheel?

If rear might be differential whine.
Honestly it's hard to tell. the sound seems to move around the cabin. I'll try to listen again on my way home and see if I can determine.
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      08-16-2022, 08:46 AM   #4
Redd
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Speed specific regardless of gears or rpm points to either wheel bearings or rear differential. Wheel bearing hum tends to get louder as speed increases, so I'm guessing rear diff.
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      08-17-2022, 02:15 PM   #5
jmeenach
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I took the car out last night after traffic cleared up and have confirmed it's coming from the rear. I also confirmed hub temps are the same left to right, so I'm assuming it is diff related. I will go through my service records from the previous owner, but I don't recall seeing a diff flush. I just hit 62k, so it's probably long overdue (though I recall reading in the manual that the diff doesn't need service?).
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      08-17-2022, 06:29 PM   #6
Redd
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Bearings can wear out even at 62k. Or it might just be low on fluid or need some friction modifier. A good workshop will be able to tell you what needs doing.
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      09-13-2022, 02:36 PM   #7
jmeenach
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OK, so I had my shop complete the diff flush, and it was apparent the diff has never been serviced. I am glad to have that done; however, the sound still remains.

My mechanic inspected the rear bearings while it was on the lift and didn't find any additional slop that indicates a bearing failure. That said, we took the car for a spin and he seems to think the left wheel bearing could be going bad, due to the location of the whirring within the cabin.

I am going to replace both rear wheel bearings for peace of mind and hope that does the trick (if not, I still have new bearings that won't need replacing soon). I am on FCC Euro's website and it appears many use the F.A.G. OE bearings P/N #33416775842.

From what I can tell, they are the same bearing as the BMW OEM unit but at a lower price. Does anyone have experience with these?
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      09-13-2022, 05:01 PM   #8
jmeenach
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NVM, I was able to go through a stickied post about OE parts and have confirmed that P/N is the same as the BMW-labeled part. Will be ordering today and will check back with an update once installed!
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