Strange Noise

MN M3 · 10-13-2009, 12:50 PM

I have a strange noise coming from the underside of my 2009 E92 M3, and I thought maybe you all can help.

It is a metal "clang" coming from the underside, front/mid section, usually only at low speed, and usually when the clutch (6 speed here) is engaged - like coasting to a stop or pulling ahead slowly into a parking garage, etc. It doesn't happen a lot, but it is there every so often. Dealer couldn't replicate it, of course.

Thoughts?

JCtx · 10-13-2009, 12:59 PM

Normal drivetrain slow-speed 'clunk' (tranny/diff slop). Yes, it's more noticeable on this car than others I've owned/driven, but there's nothing to worry about IMO. Consider it an idiosyncrasy

. These cars are not quiet by any means. Take care.

MN M3 · 10-13-2009, 01:01 PM

Quote:

Originally Posted by elp_jc

Normal drivetrain slow speed 'clunk' (slop). Yes, it's more noticeable on this car than others I've owned/driven, but there's nothing to worry about. Consider it an idiosyncrasy

. These cars are not quiet by any means. Take care.

Really? A loud "clang" is normal slop in the drivetrain? THAT loud? Weird.

JCtx · 10-13-2009, 01:04 PM

Quote:

Originally Posted by MN M3

Really? A loud "clang" is normal slop in the drivetrain? THAT loud? Weird.

Don't know how loud it is buddy, so if you're worried, get it checked. Or drive other cars. All 3 M3s I drove had it, but can't read your mind as far as loudness. You might need to change your driving technique as well. Good luck.

SenorFunkyPants · 10-13-2009, 01:04 PM

Its probably a stone caught up in the area of the brake disc backing plate. You can sometimes dislodge it by reversing or it will eventually fall out by itself.

CMOS · 10-13-2009, 01:25 PM

You should mount a video cam in the engine compartment and drive around. Record the sound that way, then play it for your service manager. That would help them. If you can tell them what you were doing while the recorded sound occurs, that would be really helpful.

Or maybe there's something else in the wheel well that you can strap it to. That might be better b/c it would be less engine noise and closer to the suspension.

Get a small cheap cam and a bunch of zip ties. I'm sure there's a way.

warzilla · 10-13-2009, 05:13 PM

Quote:

Originally Posted by SenorFunkyPants

Its probably a stone caught up in the area of the brake disc backing plate. You can sometimes dislodge it by reversing or it will eventually fall out by itself.

Search other threads. This seems to be the best explanation. I had it a couple times myself and then it went away.

Bluesummer · 10-13-2009, 05:42 PM

I talked to a couple other forum members about this noise that I experienced which is similar to OP's, " cling clang " noise that is consistent as the wheels spin, coming from rear section under panel. We took off the wheel and checked the brake and found nothing caught inside. the OP in this thread http://www.m3post.com/forums/showthread.php?t=248082 found out the noise is coming from a lose bolt in the midsection after pushing the car hard (which is what I and another forum member did according to his friend). I have yet to check on my own, but will do so this weekend. However the noise is not present anymore as of today, crossing my fingers

M3twins · 10-13-2009, 08:59 PM

Quote:

Originally Posted by elp_jc

Normal drivetrain slow-speed 'clunk' (tranny/diff slop). Yes, it's more noticeable on this car than others I've owned/driven, but there's nothing to worry about IMO. Consider it an idiosyncrasy

. These cars are not quiet by any means. Take care.

I think you've got it right there.. I also drive the 6MT and from what the OP is describing, this is the most likely culprit. I've had other manual cars that had the same characteristic. Smoother clutch disengagement and proper gear selection usually correct the issue/noise.

JCtx · 10-13-2009, 10:06 PM

Quote:

Originally Posted by M3twins

I've had other manual cars that had the same characteristic. Smoother clutch disengagement and proper gear selection usually correct the issue/noise.

Great advice buddy.
You can also duplicate the clunk by letting the rpm drop too much and allowing the engine to get jerky near idle.
By the way, there's no mistaking the gear-slop clunk with a rock on the brakes; totally different noises. Good evening folks.

foosh · 10-13-2009, 10:20 PM

Quote:

Originally Posted by M3twins

I think you've got it right there.. I also drive the 6MT and from what the OP is describing, this is the most likely culprit. I've had other manual cars that had the same characteristic. Smoother clutch disengagement and proper gear selection usually correct the issue/noise.

Yes, I also agree. Smoothness is critical with this car and the 6MT. My C6 Z06 did the same things with a less-than-smooth shift, as did manual Porsches that I've driven. Manual transmission performance cars tend to make more noises than an automatic Lexus or Infiniti.

10-13-2009, 12:50 PM	#1
MN M3 Private First Class 5 Rep 133 Posts Drives: 2009 E92 M3 Join Date: Oct 2009 Location: Southern MN, USA iTrader: (0)	Strange Noise I have a strange noise coming from the underside of my 2009 E92 M3, and I thought maybe you all can help. It is a metal "clang" coming from the underside, front/mid section, usually only at low speed, and usually when the clutch (6 speed here) is engaged - like coasting to a stop or pulling ahead slowly into a parking garage, etc. It doesn't happen a lot, but it is there every so often. Dealer couldn't replicate it, of course. Thoughts? __________________ 2009 E92 M3 - Jerez Black/Black w/ black carbon leather interior, 6 spd., Cold, Premium, Technology, 19" OZ Racing wheels (black), iPod/USB. Mods: aPe air filter, Borla exhaust, H&R sport springs, UUC Evo3 SS w/ DSSR, Power Pulley Kit, carbon kidney grills, Vorsteiner front air dam, carbon side gills, smoked side markers
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10-13-2009, 12:59 PM	#2
JCtx Major General 258 Rep 5,012 Posts Drives: No BMW yet Join Date: May 2008 Location: El Paso TX iTrader: (0)	Normal drivetrain slow-speed 'clunk' (tranny/diff slop). Yes, it's more noticeable on this car than others I've owned/driven, but there's nothing to worry about IMO. Consider it an idiosyncrasy . These cars are not quiet by any means. Take care.
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10-13-2009, 01:04 PM	#5
SenorFunkyPants Brigadier General 2510 Rep 4,381 Posts Drives: 2019 M5 Join Date: Mar 2009 Location: UK iTrader: (0)	Its probably a stone caught up in the area of the brake disc backing plate. You can sometimes dislodge it by reversing or it will eventually fall out by itself.
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10-13-2009, 01:25 PM	#6
CMOS Private 4 Rep 65 Posts Drives: Carrera 4S Join Date: Jul 2008 Location: DC Metro iTrader: (0)	You should mount a video cam in the engine compartment and drive around. Record the sound that way, then play it for your service manager. That would help them. If you can tell them what you were doing while the recorded sound occurs, that would be really helpful. Or maybe there's something else in the wheel well that you can strap it to. That might be better b/c it would be less engine noise and closer to the suspension. Get a small cheap cam and a bunch of zip ties. I'm sure there's a way.
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10-13-2009, 05:42 PM	#8
Bluesummer Lieutenant General 588 Rep 15,818 Posts Drives: slower than Ayrton Senna Join Date: Dec 2006 Location: SoCal iTrader: (15) Garage List 2017 BMW X5M [0.00] 2015 M4 [0.00] 2011 E82 135 [0.00] 2011 M3 [0.00] 2007 335 [0.00]	I talked to a couple other forum members about this noise that I experienced which is similar to OP's, " cling clang " noise that is consistent as the wheels spin, coming from rear section under panel. We took off the wheel and checked the brake and found nothing caught inside. the OP in this thread http://www.m3post.com/forums/showthread.php?t=248082 found out the noise is coming from a lose bolt in the midsection after pushing the car hard (which is what I and another forum member did according to his friend). I have yet to check on my own, but will do so this weekend. However the noise is not present anymore as of today, crossing my fingers __________________ IG:d.violet.m3
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