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General E46 Forum
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Old 04-12-2013, 10:58 PM   #1
amnesiak
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ID this noise!

It's been going on for a couple of years, on and off, and of course, never when my BMW mechanic drives it around. I pulled out the rear seat today and got a good recording of it.



When it does come about, I'll hear it during shifts and when there's not much load on the engine. It's definitely coming from the rear end. It will go away during hard acceleration or climbing hills. I now think it's the right rear wheel bearing. It stops when I go under 20mph.

ideas?
thanks.
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Old 04-15-2013, 11:44 AM   #2
amnesiak
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Nothing? I know I have a destroyed carrier bushing and i'm wondering, also, if the noise could be some sort of oscillation caused by that failed bushing.
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Old 04-15-2013, 11:49 AM   #3
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csb
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Old 04-15-2013, 11:52 AM   #4
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Originally Posted by Nerdy46 View Post
csb
Nice idea. I have taken to looking at all the schematics in the last few days, and literally just saw that about five minutes ago.
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Old 06-08-2013, 09:14 PM   #5
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OK, a bump because I replaced the CSB, Guibo, and big diff bushing today and the noise is still there.
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Old 06-09-2013, 12:46 AM   #6
trentcdrums
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ID this noise!

Oil seperator?


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Old 06-09-2013, 07:26 AM   #7
Nerdy46
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Originally Posted by amnesiak View Post
OK, a bump because I replaced the CSB, Guibo, and big diff bushing today and the noise is still there.
Wow... Can i get another video?
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Old 06-10-2013, 09:56 AM   #8
amnesiak
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Originally Posted by trentcdrums View Post
Oil seperator?
Hmm... not sure how that would apply, but I replaced it a few months ago for other reasons. Noise was present before & after.

Quote:
Originally Posted by Nerdy46 View Post
Wow... Can i get another video?
It would probably be about the same! Any suggestions on what you want? At this point I'm considering strapping my contour to the underside, pointing at the diff, to see if I can actually see anything. It really seems to be coming from the diff itself but I can't figure out what part of it it'd be from.

Driving me nuts!
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Old 06-10-2013, 01:09 PM   #9
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ID this noise!

Change your diff fluid.


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Old 06-10-2013, 01:14 PM   #10
amnesiak
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Change your diff fluid.
Did that already; fluid coming out was clear and totally fine; put new stuff in, no effect.
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Old 06-10-2013, 01:32 PM   #11
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ID this noise!

Does it get worse when you drive?


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Old 06-10-2013, 01:36 PM   #12
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Does it get worse when you drive?
No, it's pretty much completely random.
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Old 06-10-2013, 01:46 PM   #13
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ID this noise!

Check for hidden codes?


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Old 06-10-2013, 01:46 PM   #14
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Where is the noise coming from?
Rear on the driver's side/passenger side?

To me it sounds more like a drive shaft issue.
Did you change the guibo, while doing the CSB?
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Old 06-10-2013, 01:46 PM   #15
trentcdrums
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ID this noise!

After that, give the dealer 1 hour for inspection and hopefully they fix it quick in that hour.


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Old 06-10-2013, 02:07 PM   #16
amnesiak
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Originally Posted by trentcdrums View Post
Check for hidden codes?
I don't have a peake reader, but there are no standard codes being thrown... and there are no sensors back there.

Quote:
Originally Posted by trj View Post
Where is the noise coming from?
Rear on the driver's side/passenger side?

To me it sounds more like a drive shaft issue.
Did you change the guibo, while doing the CSB?
I can't locate it as specifically as that. It seems to be centered, but noises like that are quite tricky; it took me a long time to locate it. The best I can tell has been with the rear seat out.

I replaced the guibo with the CSB. Both were actually in fine shape considering the age and mileage of the car.
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Old 06-10-2013, 02:25 PM   #17
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Originally Posted by amnesiak View Post
I don't have a peake reader, but there are no standard codes being thrown... and there are no sensors back there.



I can't locate it as specifically as that. It seems to be centered, but noises like that are quite tricky; it took me a long time to locate it. The best I can tell has been with the rear seat out.

I replaced the guibo with the CSB. Both were actually in fine shape considering the age and mileage of the car.
Happened to me, I changed the CSB, guibo, the whole suspension, parking brakes, RTABs, and the noise turned out to be wheel bearings.
I am glad I did all those fixes but I could have held up those repairs and got to the root if I could have located the noise.

My issue was, the car made noise only when there was load on the wheels and was doing around 30~40mph. On the lifts it never made any noise. Hence, I had to do trial and error.
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Old 06-10-2013, 02:28 PM   #18
amnesiak
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Originally Posted by trj View Post
Happened to me, I changed the CSB, guibo, the whole suspension, parking brakes, RTABs, and the noise turned out to be wheel bearings.
I am glad I did all those fixes but I could have held up those repairs and got to the root if I could have located the noise.

My issue was, the car made noise only when there was load on the wheels and was doing around 30~40mph. On the lifts it never made any noise. Hence, I had to do trial and error.
Wheel bearings were my very first thought - but absolutely everyone says they don't sound like wheel bearings. How did yours sound?
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Old 06-10-2013, 02:36 PM   #19
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If the noise is more pronounced on driver's or passenger side, I'd definitely guess it as bearings.
I had a weird noise too, which everyone said its not the bearings.
Here's my thread with the audio file.

http://forum.e46fanatics.com/showthread.php?t=978788

I just updated it with the solution lol.
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Old 06-10-2013, 02:40 PM   #20
amnesiak
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Originally Posted by trj View Post
If the noise is more pronounced on driver's or passenger side, I'd definitely guess it as bearings.
I had a weird noise too, which everyone said its not the bearings.
Here's my thread with the audio file.

http://forum.e46fanatics.com/showthread.php?t=978788

I just updated it with the solution lol.
Wow, that's definitely the most similar sound to mine that I've ever heard! Thank you!
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