[Video]: What is this noise? HELP!

The Automotive Enthusiast · 08-31-2013, 08:16 PM

This now happens only in reverse. Last night coming home from the Baltimore Grand Prix, it was about 10x as loud going in drive. I had my car towed to a dealer but it won't be looked at till Tuesday. Any help is greatly appreciated. It sounds like grinding, and the issue is intermittent.

2013 BMW M3
6,100 miles

The Automotive Enthusiast · 09-01-2013, 12:33 AM

Nobody?

kawchkjf · 09-01-2013, 01:33 AM

they'll most likely program your tranny and dme first and send you off

doesn't sound good though! lol

FVM3 · 09-01-2013, 10:26 AM

doest sound good , bring it in to the dealer, only problem is your car is modded , also you got a dct tune

The Automotive Enthusiast · 09-01-2013, 10:53 AM

Quote:

Originally Posted by FVM3

doest sound good , bring it in to the dealer, only problem is your car is modded , also you got a dct tune

I can flash back to stock, but i doubt the DCT tune will be any issue. Appointment to go in Wednesday.

SilentAttack · 09-01-2013, 11:01 AM

Yikes. Doesnt sound good. Good luck with the fix..

The Automotive Enthusiast · 09-01-2013, 01:22 PM

Because it's intermittent, I'm hoping they can find the problem and fix it.

MilehighM3 · 09-01-2013, 01:40 PM

The video says its currently unavailable

The Automotive Enthusiast · 09-01-2013, 01:59 PM

Quote:

Originally Posted by Bmw135er

The video says its currently unavailable

Refresh. I'm playing it fine now.

MilehighM3 · 09-01-2013, 02:49 PM

Do you have any suspension or exhaust mods?

The Automotive Enthusiast · 09-01-2013, 02:51 PM

Quote:

Originally Posted by Bmw135er

Do you have any suspension or exhaust mods?

No suspension. ESS exhaust.

MilehighM3 · 09-01-2013, 02:54 PM

It almost sounds like an exhaust rattle against a heat shield, but it's difficult to tell by the video. Perhaps wiggle the exhaust with your hands and see if it contacts anything?

1MOREMOD · 09-01-2013, 03:14 PM

Quote:

Originally Posted by Bmw135er

It almost sounds like an exhaust rattle against a heat shield, but it's difficult to tell by the video. Perhaps wiggle the exhaust with your hands and see if it contacts anything?

Possibly this. I had similar issue with aftermarket x pipe and crossmember. Had to shim the crossmember with washers.

The Automotive Enthusiast · 09-01-2013, 03:49 PM

Quote:

Originally Posted by Bmw135er

It almost sounds like an exhaust rattle against a heat shield, but it's difficult to tell by the video. Perhaps wiggle the exhaust with your hands and see if it contacts anything?

Quote:

Originally Posted by 1MOREMOD

Possibly this. I had similar issue with aftermarket x pipe and crossmember. Had to shim the crossmember with washers.

Hmm, I'll look into it but why would it happen in reverse only?

1MOREMOD · 09-01-2013, 03:54 PM

Quote:

Originally Posted by PoweredBy///M

Hmm, I'll look into it but why would it happen in reverse only?

Magic! I'm not sure why that would be.

MilehighM3 · 09-01-2013, 04:00 PM

Quote:

Originally Posted by PoweredBy///M

Hmm, I'll look into it but why would it happen in reverse only?

Load reversal causes things to shift in an opposite direction than they normally do in forward gears. Certain x pipes that are larger in diameter come with spacers to prevent this. If it is indeed x pipe related. Make sure the mufflers aren't contacting the rear bumper or the rear subframe either.

The Automotive Enthusiast · 09-01-2013, 04:20 PM

Quote:

Originally Posted by Bmw135er

Load reversal causes things to shift in an opposite direction than they normally do in forward gears. Certain x pipes that are larger in diameter come with spacers to prevent this. If it is indeed x pipe related. Make sure the mufflers aren't contacting the rear bumper or the rear subframe either.

Should I look for any damage?

MilehighM3 · 09-01-2013, 04:28 PM

Not necessarily damage, but perhaps a small contact patch on the exhaust and what it may be contacting. If indeed that is the source of the noise.

The Automotive Enthusiast · 09-01-2013, 05:02 PM

Thanks, I'll look into it.

bsiciliano · 09-01-2013, 08:20 PM

It sounds like the exhaust is rubbing. Mine occasionally does that too, but I only hear it with the top up because it makes the roof rattle. If you get it on a lift you can tell. You can put in an extra washer on each side to drop it a few millimeters. That may help.

The Automotive Enthusiast · 09-02-2013, 01:32 AM

Quote:

Originally Posted by bsiciliano

It sounds like the exhaust is rubbing. Mine occasionally does that too, but I only hear it with the top up because it makes the roof rattle. If you get it on a lift you can tell. You can put in an extra washer on each side to drop it a few millimeters. That may help.

Taking it in Wednesday. What part of the exhaust would it be? X Pipe?

1MOREMOD · 09-02-2013, 08:58 AM

i would still say x-pipe, thats where mine rattled right at the crossmember but it could be anywhere along the entire length just about depending on install.

09-01-2013, 01:33 AM	#3
kawchkjf Private 5 Rep 69 Posts Drives: 2009 bmw m3 Join Date: Dec 2011 Location: canada iTrader: (0)	they'll most likely program your tranny and dme first and send you off doesn't sound good though! lol
	Appreciate 0 Quote

09-01-2013, 10:26 AM	#4
FVM3 Major General 273 Rep 5,751 Posts Drives: e92 m3, f30 328i Join Date: Sep 2010 Location: Los Angeles iTrader: (2)	doest sound good , bring it in to the dealer, only problem is your car is modded , also you got a dct tune
	Appreciate 0 Quote

09-01-2013, 11:01 AM	#6
SilentAttack Lieutenant Colonel 163 Rep 1,790 Posts Drives: 08 E90 Jerez Black 6MT Join Date: Nov 2011 Location: Nashville, TN iTrader: (0)	Yikes. Doesnt sound good. Good luck with the fix.. __________________ Stupid Photobucket
	Appreciate 0 Quote

09-01-2013, 01:40 PM	#8
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	The video says its currently unavailable
	Appreciate 0 Quote

09-01-2013, 02:49 PM	#10
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	Do you have any suspension or exhaust mods?
	Appreciate 0 Quote

09-01-2013, 02:54 PM	#12
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	It almost sounds like an exhaust rattle against a heat shield, but it's difficult to tell by the video. Perhaps wiggle the exhaust with your hands and see if it contacts anything?
	Appreciate 0 Quote

09-01-2013, 04:28 PM	#18
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	Not necessarily damage, but perhaps a small contact patch on the exhaust and what it may be contacting. If indeed that is the source of the noise.
	Appreciate 0 Quote

09-01-2013, 08:20 PM	#20
bsiciliano Captain 51 Rep 698 Posts Drives: 2011 M3 Convertible Join Date: Apr 2011 Location: Los Angeles iTrader: (4)	It sounds like the exhaust is rubbing. Mine occasionally does that too, but I only hear it with the top up because it makes the roof rattle. If you get it on a lift you can tell. You can put in an extra washer on each side to drop it a few millimeters. That may help. __________________ 2011 E93 - Space Gray - 6MT/Silver Novillo/ OE Tuning/Gruppe M Intake/ACS Springs/Vorsteiner CF Type I Rear Diffuser/Textured Matte Black Custom Powdercoated OEM 359s/Painted Reflectors/Matte Grille, Hood Vents and Side Markers/Arqray Race Exhaust/MS Pulley
	Appreciate 0 Quote

09-02-2013, 08:58 AM	#22
1MOREMOD - 11817 Rep 23,187 Posts Drives: Race car-> Join Date: Mar 2009 Location: check your mirrors iTrader: (5)	i would still say x-pipe, thats where mine rattled right at the crossmember but it could be anywhere along the entire length just about depending on install. __________________ 02 Tiag e46 M3\|6MT\|GC plates\|MCS c.o.\|GC bars\|GC race control arms\|GC bushings\|BW eng. & tran. mounts\|subframe kit\|BW race shifter\|BW Jaffster\|Euro header\|BW exhaust\|K&N c.a.i.\|Epic race tune\|Rouge pulleys\|Seibon CF hood\|CSL bumper\|apr gt 250 & splitter\|ST-40\|XR-2\|SS lines\|half cage\|Recaro profi\|Profi 2 harness\|BMWpedals\|BW studs\|
	Appreciate 0 Quote