Rattle under hard acceleration. [UPDATE]

Definitive · 09-29-2014, 10:02 AM

I have a pretty severe rattle in the armrest compartment only under hard acceleration. I thought it was my BMW pen, but then I emptied the compartment, still there. Pulled out the phone cradle dummy piece, still there.

Cars going in today for break in service. Hoping they can figure it out. Pretty annoying.

Anyone else with this?

D

Update - Its now Wed and the car has been at the dealer for 3 days. They are not sure if they will have it fixed tomorrow, or if it will take a week, or two or three, to get the solution. I dont even know what to do.

They think they figured out what it is, but I am being told there is no known solution and they have to keep my car till they get an answer from BMW on what to do.

They are saying that the E-brake lines are hitting the CF driveshaft under the car when I accelerate. They are not sure if I need a new driveshaft, or if they need to unbolt everything under the car and then reassemble seeing if that gave the parts some space. (They already have the exhaust down, and all the heat shields off the bottom of the car.

Update 2: they found a way to adjust the brake line guides so that it is further away from the driveshaft and say that it does not happen anymore. I will be picking it up in the morning.

secretariat · 09-29-2014, 10:15 AM

Don't have my car yet!!!!!

///M ARMY · 09-29-2014, 10:16 AM

A bolt might be loose to cause that noise.

kitw · 09-29-2014, 12:34 PM

I have one under the car. It's a metallic rattle, almost sounds like the exhaust.

Definitive · 10-01-2014, 03:48 PM

OP Updated.

Definitive · 10-01-2014, 03:49 PM

Quote:

Originally Posted by kitw

I have one under the car. It's a metallic rattle, almost sounds like the exhaust.

Sounds like you may have the same issue. Does it kinda sound like its coming from the armrest compartment?

D

Kief · 11-12-2014, 06:19 AM

Quote:

Originally Posted by Definitive

Update 2: they found a way to adjust the brake line guides so that it is further away from the driveshaft and say that it does not happen anymore. I will be picking it up in the morning.

Did it work?
I think I may have the same rattle under hard acceleration. The rattle sounds like it underneath the car, right in the middle (so I guess the armrest area)

Quote:

Originally Posted by kitw

I have one under the car. It's a metallic rattle, almost sounds like the exhaust.

I thought it was the exhaust as well. Did you get it looked at?

Maddict3 · 11-12-2014, 09:22 AM

Quote:

Originally Posted by Kief

Quote:

Originally Posted by Definitive

Update 2: they found a way to adjust the brake line guides so that it is further away from the driveshaft and say that it does not happen anymore. I will be picking it up in the morning.

Did it work?
I think I may have the same rattle under hard acceleration. The rattle sounds like it underneath the car, right in the middle (so I guess the armrest area)

Quote:

Originally Posted by kitw

I have one under the car. It's a metallic rattle, almost sounds like the exhaust.

I thought it was the exhaust as well. Did you get it looked at?

Same thing is happening to me.

Any solutions?

dkhm3 · 11-12-2014, 12:17 PM

wow. hmm still under break in. better bookmark this thread!!!

phil.harlow · 11-19-2014, 10:32 PM

Is this the sound you guys are hearing?

Does anyone have details on the fix? Is definitive still around?

Labeef · 11-19-2014, 11:25 PM

There is a service bulletin for this. The parking brake cables rub against the drive shaft during hard acceleration. The techs are instructed to bend the tubes that carry the cables slightly up which provides enough clearance for the drive shaft.

NorCal f80 · 11-19-2014, 11:33 PM

Quote:

Originally Posted by phil.harlow

Is this the sound you guys are hearing?

Does anyone have details on the fix? Is definitive still around?

Hard to hear when the video is private.

phil.harlow · 11-19-2014, 11:56 PM

Quote:

Originally Posted by Labeef

There is a service bulletin for this. The parking brake cables rub against the drive shaft during hard acceleration. The techs are instructed to bend the tubes that carry the cables slightly up which provides enough clearance for the drive shaft.

Awesome! I wasn't sure if they had addressed it internally yet. Thanks!

Quote:

Originally Posted by 0-100 nga real quick

Hard to hear when the video is private.

Whoops, sorry, should be viewable now.

Needsdecaf · 11-20-2014, 06:26 AM

Yikes! Have driven three F8x in anger now, none of them had this noise.

Kief · 11-20-2014, 06:47 AM

Quote:

Originally Posted by Labeef

There is a service bulletin for this

Happen to have it?
Thanks

Falafel Combo · 11-20-2014, 07:03 AM

Keep us posted! Sounds like a headache!

kitw · 11-20-2014, 12:36 PM

Thanks for posting, I guess that is two things I need to have the dealer look at.

JoeFromPA · 11-20-2014, 01:36 PM

Driveshaft knocks almost always manifest as a sound coming from the center armrest in every car I've known...

I just sold a vehicle that the driveshaft was improperly installed in (a brand new one, installed at a dealership), and when the car unleashed all 600 lb/ft of torque the driveshaft itself would slap the tunnel. Felt like someone was hititng the underside of the armrest with a sledgehammer

A418t81 · 11-21-2014, 07:31 AM

I had the exact same problem. Really only did it at full throttle in second gear. My car was in the shop for 30 days because of it! They replaced diff bushings and that didn't fix it. I told them when I dropped it off that I thought it was the driveshaft rubbing in the back. Mine started doing it the second day I had it in Europe.

They put a GoPro under my car and drove it around. The driveshaft is moving around too much. It literally is bouncing around under there when you get into power. They sent the footage to BMW for review.

Not very happy with the short term solution. Just moving what the driveshaft is hitting out of the way doesn't solve the fact that the DS is moving entirely too much.

Oh, and Phil Harlow...you've got the problem too. Exactly what mine sounded like.

AMPowerJ · 11-21-2014, 08:00 AM

I've got it too ... Sounds like an industrial zipper being unzipped. Love this car but it makes crazy sounds.

Labeef · 11-22-2014, 12:24 AM

By adjusting, they bend the tube 10mm upward lol.

slalomfever · 11-22-2014, 08:50 AM

I wish my noises were as simple as the service bulletin states. We looked at the drive shaft and e-brake cable but there was no visible contact between the two. The noises happen between 2nd and 3rd gear and 20-40 MPH.
However, now that's its pretty cold in the North East, I have not heard the noise. Weird.

09-29-2014, 10:02 AM	#1
Definitive definitivecars.com 353 Rep 3,833 Posts Drives: Elsa - 2015 F80 M3 - YMB/SS Join Date: Aug 2006 Location: So Cal iTrader: (3) Garage List 2011 E90 M3 [6.66] 2009 (Lease up Sept ... [0.00] 2007 (Lease up 6/19 ... [0.00] 2007 (Lease up Octo ... [0.00]	I have a pretty severe rattle in the armrest compartment only under hard acceleration. I thought it was my BMW pen, but then I emptied the compartment, still there. Pulled out the phone cradle dummy piece, still there. Cars going in today for break in service. Hoping they can figure it out. Pretty annoying. Anyone else with this? D Update - Its now Wed and the car has been at the dealer for 3 days. They are not sure if they will have it fixed tomorrow, or if it will take a week, or two or three, to get the solution. I dont even know what to do. They think they figured out what it is, but I am being told there is no known solution and they have to keep my car till they get an answer from BMW on what to do. They are saying that the E-brake lines are hitting the CF driveshaft under the car when I accelerate. They are not sure if I need a new driveshaft, or if they need to unbolt everything under the car and then reassemble seeing if that gave the parts some space. (They already have the exhaust down, and all the heat shields off the bottom of the car. Update 2: they found a way to adjust the brake line guides so that it is further away from the driveshaft and say that it does not happen anymore. I will be picking it up in the morning. Last edited by Definitive; 10-02-2014 at 12:36 AM..
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09-29-2014, 10:15 AM	#2
secretariat Major 953 Rep 1,455 Posts Drives: 2016 X5M Join Date: Dec 2012 Location: New York iTrader: (0)	Don't have my car yet!!!!!
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09-29-2014, 10:16 AM	#3
///M ARMY Brigadier General 1002 Rep 3,051 Posts Drives: F90 Join Date: Jul 2012 Location: Cali iTrader: (2)	A bolt might be loose to cause that noise. __________________ 2022 RAM TRX 2021 Ford Bronco 2022 BMW M3
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09-29-2014, 12:34 PM	#4
kitw Colonel 471 Rep 2,991 Posts Drives: F91 M8, 991.2 GT3 Join Date: Jun 2007 Location: Bay Area, CA iTrader: (20)	I have one under the car. It's a metallic rattle, almost sounds like the exhaust. __________________ DSC_3369 by Kit W, on Flickr
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10-01-2014, 03:48 PM	#5
Definitive definitivecars.com 353 Rep 3,833 Posts Drives: Elsa - 2015 F80 M3 - YMB/SS Join Date: Aug 2006 Location: So Cal iTrader: (3) Garage List 2011 E90 M3 [6.66] 2009 (Lease up Sept ... [0.00] 2007 (Lease up 6/19 ... [0.00] 2007 (Lease up Octo ... [0.00]	OP Updated.
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11-12-2014, 12:17 PM	#9
dkhm3 Brigadier General 1881 Rep 3,341 Posts Drives: 991.2 GT3 2020 X3MC Join Date: Jan 2009 Location: Orange County iTrader: (0)	wow. hmm still under break in. better bookmark this thread!!! __________________ Currently: 2018 GT3 2020 X3MC Previously: 1999 M3 2002 M3 2005 S4 2008 C63 2015 M3 2016 X5M 2019 911S
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11-19-2014, 10:32 PM	#10
phil.harlow Driving Enthusiast 151 Rep 185 Posts Drives: 2021 F90 Comp Frozen Bluestone Join Date: Jul 2011 Location: Bothell, WA iTrader: (0) Garage List 2018 BMW M3 [0.00]	Is this the sound you guys are hearing? Does anyone have details on the fix? Is definitive still around? __________________ 2021 Frozen Bluestone ///M5 Comp - Ordered 9/6/20 \| Finished Production 10/19/20 \| Delivered 12/13/20 2018 Mineral Grey ///M3 - Ordered 7/24/17 \| Euro Delivery 9/1/17 \| US Delivery 10/31/17 2015 Mineral White ///M3 - Ordered 4/6/14 \| Finished Production 8/28/14 \| Delivered 10/11/14 2011 Black E90 335xi - Ordered 7/10/11 \| Finished Production 7/20/11 \| Delivered 9/3/11 Last edited by phil.harlow; 11-19-2014 at 10:53 PM..
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11-19-2014, 11:25 PM	#11
Labeef Captain 265 Rep 807 Posts Drives: 320I Sport/Xenon Join Date: Jul 2014 Location: Bay Area, CA iTrader: (0)	There is a service bulletin for this. The parking brake cables rub against the drive shaft during hard acceleration. The techs are instructed to bend the tubes that carry the cables slightly up which provides enough clearance for the drive shaft.
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11-20-2014, 06:26 AM	#14
Needsdecaf Major General 6513 Rep 6,659 Posts Drives: 2024 G80 Comp xDrive Join Date: Feb 2011 Location: The Woodlands, TX iTrader: (0)	Yikes! Have driven three F8x in anger now, none of them had this noise.
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11-20-2014, 07:03 AM	#16
Falafel Combo Banned 3773 Rep 6,673 Posts Drives: X5 xDrive50i Join Date: May 2011 Location: New England iTrader: (3)	Keep us posted! Sounds like a headache!
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11-20-2014, 12:36 PM	#17
kitw Colonel 471 Rep 2,991 Posts Drives: F91 M8, 991.2 GT3 Join Date: Jun 2007 Location: Bay Area, CA iTrader: (20)	Thanks for posting, I guess that is two things I need to have the dealer look at. __________________ DSC_3369 by Kit W, on Flickr
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11-20-2014, 01:36 PM	#18
JoeFromPA Colonel 1792 Rep 2,995 Posts Drives: '15 AW M3 6MT Stripper Join Date: Aug 2013 Location: SE PA iTrader: (0)	Driveshaft knocks almost always manifest as a sound coming from the center armrest in every car I've known... I just sold a vehicle that the driveshaft was improperly installed in (a brand new one, installed at a dealership), and when the car unleashed all 600 lb/ft of torque the driveshaft itself would slap the tunnel. Felt like someone was hititng the underside of the armrest with a sledgehammer
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11-21-2014, 07:31 AM	#19
A418t81 Lieutenant Colonel 293 Rep 1,514 Posts Drives: Ever changing fleet Join Date: May 2007 Location: Alabama iTrader: (1) Garage List 2013 335is [0.00]	I had the exact same problem. Really only did it at full throttle in second gear. My car was in the shop for 30 days because of it! They replaced diff bushings and that didn't fix it. I told them when I dropped it off that I thought it was the driveshaft rubbing in the back. Mine started doing it the second day I had it in Europe. They put a GoPro under my car and drove it around. The driveshaft is moving around too much. It literally is bouncing around under there when you get into power. They sent the footage to BMW for review. Not very happy with the short term solution. Just moving what the driveshaft is hitting out of the way doesn't solve the fact that the DS is moving entirely too much. Oh, and Phil Harlow...you've got the problem too. Exactly what mine sounded like. __________________ 23 iX M60, 24 GT3 RS Weissach, 22 Rivian R1T, 23 RS3, 13 E92 M3 Competition: Akra Evo, KW V3, etc Last edited by A418t81; 11-21-2014 at 07:37 AM..
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11-21-2014, 08:00 AM	#20
AMPowerJ One mod leads to another ... 415 Rep 2,900 Posts Drives: 2014 F10 M5 Join Date: Apr 2008 Location: Blythewood, SC iTrader: (10)	I've got it too ... Sounds like an industrial zipper being unzipped. Love this car but it makes crazy sounds. __________________ Current: 2014 F10 M5 Previous: 2015 F80 M3, 2013 E92 M3, 2013 F10 M5, 2009 E90 M3, 1998 E36 M3
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11-22-2014, 12:24 AM	#21
Labeef Captain 265 Rep 807 Posts Drives: 320I Sport/Xenon Join Date: Jul 2014 Location: Bay Area, CA iTrader: (0)	By adjusting, they bend the tube 10mm upward lol. Last edited by Labeef; 11-24-2014 at 05:08 PM..
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11-22-2014, 08:50 AM	#22
slalomfever 1095 Rep 2,151 Posts Drives: Nardo Grey F80 Join Date: Mar 2007 Location: Long Island, NY iTrader: (5)	I wish my noises were as simple as the service bulletin states. We looked at the drive shaft and e-brake cable but there was no visible contact between the two. The noises happen between 2nd and 3rd gear and 20-40 MPH. However, now that's its pretty cold in the North East, I have not heard the noise. Weird. Attached Images
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