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      01-18-2015, 03:45 PM   #1
Accel Junky
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Grinding sound under full throttle?

Anyone else experienced this?

I am getting a grinding sound when accelerating full throttle in 1st or 2nd gear. I thought at first it sounded far away from the driver (so I was thinking diff noises) but I was able to repeat the noise multiple times this weekend with my wife in the car and she is certain it is coming from the transmission tunnel area.

Sounds sort of like a muted gear grind. 6MT btw.

Anyone else have an issue like this?

EDIT: I went out just now to try to replicate conditions and I get this only in 1st and 2nd gear under full throttle acceleration. Same noise whether the car is in efficient, MDM or DSC off. I am able to replicate it every single time now. This sound does not occur in 3rd gear or higher. Now that I'm able to replicate it I believe I can take it to dealer.

I took a video inside of the cabin for you but you cannot hear the grinning in the video. No point in posting that.

Last edited by Accel Junky; 01-18-2015 at 05:53 PM..
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      01-18-2015, 05:56 PM   #2
SMOKE EM IF U GOT EM!!
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Yes there was a thread on this issue. Service bulletin too if I remember correctly. Had something to do w loose cable or cover in the transmission tunnel banging around hitting the driveshaft. I'll try to find it for you but def search around. Think there was more than one thread on it. Someone also made a video of it too.

Edit: here you go. Hope this helps

http://f80.bimmerpost.com/forums/sho...eshaft+banging
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Last edited by SMOKE EM IF U GOT EM!!; 01-18-2015 at 06:09 PM..
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      01-18-2015, 06:12 PM   #3
Accel Junky
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Quote:
Originally Posted by SMOKE EM IF U GOT EM!! View Post
Yes there was a thread on this issue. Service bulletin too if I remember correctly. Had something to do w loose cable or cover in the transmission tunnel banging around hitting the driveshaft. I'll try to find it for you but def search around. Think there was more than one thread on it. Someone also made a video of it too.

Edit: here you go. Hope this helps

http://f80.bimmerpost.com/forums/sho...eshaft+banging
I'll be damned! That is exactly it! I searched with the term "sound" and did not see this thread earlier. Thanks!

Mods feel free to delete. I'll chime in on the other thread.
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      01-18-2015, 07:06 PM   #4
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Quote:
Originally Posted by Accel Junky View Post
I'll be damned! That is exactly it! I searched with the term "sound" and did not see this thread earlier. Thanks!

Mods feel free to delete. I'll chime in on the other thread.


good luck.
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      01-19-2015, 04:25 AM   #5
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Posted by,iamwingman,, Yesterday, 11:04 PM

Akrapovic totally eliminated my rattle. Bmw had tried to tell me it wasn't the exhaust but the wastegate that was causing the metallic rattle. It was clear as day it was coming from the muffler, but I had better things to do than stand and argue with the "expert". Love the Akrapovic BTW..
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