Weird click on takeoff and weight transfer

Kprad12 · 01-06-2019, 10:27 PM

So as the title suggests I am racking my brain trying to figure out what is causing this noise. The noise sounds like a bolt snapping into place. It happens when I start from a stop or after accelerating when the car was just engine braking. The sound can also be replicated by reversing then moving forward. I first noticed it in parking lots where the car three wheels a bit in ruts (whatever the transition from asphalt to concrete is called). Anyways the sound seems to be coming from under the drivers seat which is securely bolted in place. The car is a 2015 6spd m4 with 14k miles. If anyone has any ideas let me know. Seems quite similar to this https://www.e90post.com/forums/showthread.php?t=175885 on the e9x platform.
Thanks,
Karthik

cionide · 01-07-2019, 05:35 AM

I had a similar issue with my Audi S6 - They ended up replacing the whole seat frame under warranty to fix it.

Kbueno · 01-07-2019, 08:48 AM

Could it be the driveshaft rubbing on the brake tube? (Search the TSB for this) Mine sounded like a click as well before Dealer fixes under warranty.

Kprad12 · 01-07-2019, 09:02 PM

Thx I'll look into the tsb. I don't think its the seat as I tried moving the seat around while I was driving and moving the seat didn't alter the sound at all. Heres a video for the sound

not sure how to describe the sound it has progressed into multiple clicks. Anyone got any other ideas?

FatRear08 · 01-08-2019, 11:41 AM

I had something similar and it wound up being the brace that runs across the midpipe. It needed to be torqued down a bit. Because it wasn’t, on accel the car naturally flexes and the brace would creak.

m44now · 01-09-2019, 12:01 AM

it is a brace under the mid pipe, i had mine at the dealer for a week until they found it.

schnell325 · 01-09-2019, 05:15 AM

Quote:

Originally Posted by m44now

it is a brace under the mid pipe, i had mine at the dealer for a week until they found it.

Very likely, especially if you have an aftermarket midpipe ...

Kprad12 · 01-09-2019, 08:06 PM

If anyone else has this problem it is the brace by the midpipe. 3 of the 4 bolts were finger loose I added some thread-lock and screwed them back in. My car is stock I have no clue why they came lose. Thanks for the help guys.

01-06-2019, 10:27 PM	#1
Kprad12 ///M 4 Rep 44 Posts Drives: 2015 M4 6spd, 2015 M5 Comp Join Date: May 2018 Location: San Diego iTrader: (0)	Weird click on takeoff and weight transfer So as the title suggests I am racking my brain trying to figure out what is causing this noise. The noise sounds like a bolt snapping into place. It happens when I start from a stop or after accelerating when the car was just engine braking. The sound can also be replicated by reversing then moving forward. I first noticed it in parking lots where the car three wheels a bit in ruts (whatever the transition from asphalt to concrete is called). Anyways the sound seems to be coming from under the drivers seat which is securely bolted in place. The car is a 2015 6spd m4 with 14k miles. If anyone has any ideas let me know. Seems quite similar to this https://www.e90post.com/forums/showthread.php?t=175885 on the e9x platform. Thanks, Karthik
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01-07-2019, 05:35 AM	#2
cionide Second Lieutenant 141 Rep 258 Posts Drives: 2019 M4 ZCP Join Date: Mar 2013 Location: Wroclaw, Poland iTrader: (0)	I had a similar issue with my Audi S6 - They ended up replacing the whole seat frame under warranty to fix it. __________________ 2019 M4 ZCP / Yas Marina Blue M-Performance Front Splitters / M-Performance Rear Spoiler / Rieger Tuning Side-skirt Extensions / Carbonwurks Rear Diffuser / Alcantara M-Performance Interior Accessories
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01-07-2019, 08:48 AM	#3
Kbueno Lieutenant Colonel 99 Rep 1,712 Posts Drives: F82 Join Date: Jan 2007 Location: California iTrader: (5)	Could it be the driveshaft rubbing on the brake tube? (Search the TSB for this) Mine sounded like a click as well before Dealer fixes under warranty.
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01-07-2019, 09:02 PM	#4
Kprad12 ///M 4 Rep 44 Posts Drives: 2015 M4 6spd, 2015 M5 Comp Join Date: May 2018 Location: San Diego iTrader: (0)	Thx I'll look into the tsb. I don't think its the seat as I tried moving the seat around while I was driving and moving the seat didn't alter the sound at all. Heres a video for the sound not sure how to describe the sound it has progressed into multiple clicks. Anyone got any other ideas?
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01-08-2019, 11:41 AM	#5
FatRear08 Major 1427 Rep 1,195 Posts Drives: F90 M5 Join Date: Apr 2012 Location: HHI iTrader: (0)	I had something similar and it wound up being the brace that runs across the midpipe. It needed to be torqued down a bit. Because it wasn’t, on accel the car naturally flexes and the brace would creak.
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01-09-2019, 12:01 AM	#6
m44now Private 14 Rep 66 Posts Drives: m4 Join Date: Nov 2017 Location: los angeles iTrader: (0)	it is a brace under the mid pipe, i had mine at the dealer for a week until they found it.
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01-09-2019, 08:06 PM	#8
Kprad12 ///M 4 Rep 44 Posts Drives: 2015 M4 6spd, 2015 M5 Comp Join Date: May 2018 Location: San Diego iTrader: (0)	If anyone else has this problem it is the brace by the midpipe. 3 of the 4 bolts were finger loose I added some thread-lock and screwed them back in. My car is stock I have no clue why they came lose. Thanks for the help guys.
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