Noise coming from rear of car

S65Hunter · 03-12-2024, 02:33 PM

When I'm at a stop and roll forward or backwards, I hear a faint noise coming from the rear of the car that sounds like some one crinkcling an empty bag of chips. Weird comparison I know, but its pretty accurate. Any ideas on what this could be? I jacked the rear end up and turned the wheels by hand but no noise.

omgzirra_exe · 03-12-2024, 03:18 PM

Quote:

Originally Posted by S65Hunter

When I'm at a stop and roll forward or backwards, I hear a faint noise coming from the rear of the car that sounds like some one crinkcling an empty bag of chips. Weird comparison I know, but its pretty accurate. Any ideas on what this could be? I jacked the rear end up and turned the wheels by hand but no noise.

check for a loose diff bolt, pretty common for these to back out somehow.

MineralWhiteF80 · 03-12-2024, 03:19 PM

you should try to repeat your test with the car sitting on all four tires and the transmission in neutral. Find a safe spot that is flat and quiet. Place the transmission in neutral, and then push the top of one of the rear tires to easily make the car roll forward and backward and listen for the noise.

It's possible the noise is only present at standard ride height, but when jacked up off the ground the suspension/tire positions change the location of whatever is rubbing or making the noise.

Maybe someone is locked in your trunk and just finished a bag chips?

S65Hunter · 03-12-2024, 03:22 PM

Quote:

Originally Posted by MineralWhiteF80

you should try to repeat your test with the car sitting on all four tires and the transmission in neutral. Find a safe spot that is flat and quiet. Place the transmission in neutral, and then push the top of one of the rear tires to easily make the car roll forward and backward and listen for the noise.

It's possible the noise is only present at standard ride height, but when jacked up off the ground the suspension/tire positions change the location of whatever is rubbing or making the noise.

Maybe someone is locked in your trunk and just finished a bag chips?

I haven't seen my neighbor in a few days...maybe it's him! But yeah that doesn't sound like a bad idea. I'll do that once it's quiter outside

Scrippy · 03-12-2024, 08:45 PM

Sometimes the rear heat shield comes in contact with the drive shaft. Being that it’s super thin aluminum it sounds like a bush or scrapping can noise kinda. Just pull it away from the drive shaft to gain at least 1/2” clearance.

krudmunk · 03-12-2024, 10:27 PM

My muffler hanger weld competely deteriorated and separated and was making like brake squeak noise at cold start. This is the center metal hanger that the diffuser also attaches to.

I didn’t know until I recently installed new exhaust. Probably not the exact same issue but might be worthwhile to check it out.

amrazM · 03-13-2024, 05:06 AM

cv joint

S65Hunter · 03-13-2024, 08:08 PM

Quote:

Originally Posted by amrazM

cv joint

I think you may be correct. Here is a video I took
https://youtu.be/cDd0sxmtbpk?si=vh0f-i3jY3LY0kYy

S65Hunter · 03-13-2024, 09:32 PM

After listening to the video above. What would yall say the issue?

amrazM · 03-14-2024, 05:09 AM

which noise is it? the first noise sounds like the rotor on the backing plate the more faint noise sounds like the cv.

S65Hunter · 03-14-2024, 05:31 AM

Quote:

Originally Posted by amrazM

which noise is it? the first noise sounds like the rotor on the backing plate the more faint noise sounds like the cv.

The crunchy/gritty noise. Which I'd assume is the cv axle. Just wondering if I'd need to replace the whole axle or not

djschmitt · 03-15-2024, 09:56 AM

Quote:

Originally Posted by S65Hunter

The crunchy/gritty noise. Which I'd assume is the cv axle. Just wondering if I'd need to replace the whole axle or not

Super random, but I just took my car to the shop with a similar experience and they said it was a small piece of debris that was stuck in the parking break boot (or something similar). Noise would exist when driving slowly, go away with speed, and go away once up to temperature. Noise wouldn't return until everything cooled back off.

They said they removed the debris and the noise hasn't returned.

S65Hunter · 03-15-2024, 10:00 AM

Quote:

Originally Posted by djschmitt

Super random, but I just took my car to the shop with a similar experience and they said it was a small piece of debris that was stuck in the parking break boot (or something similar). Noise would exist when driving slowly, go away with speed, and go away once up to temperature. Noise wouldn't return until everything cooled back off.

They said they removed the debris and the noise hasn't returned.

I'll have to check that out when I get back home.

exVtekGuy · 03-16-2024, 04:49 PM

Could be small rock stuck between rotor and dust shield. I had that problem before.

S65Hunter · 03-17-2024, 12:21 PM

So far, you're correct. I took the brake rotor off, cleaned it really well on the inside since there was a bunch if build up. Sprayed the parking brake down with brake cleaner and a fine wire brush. The noise hasn't come back yet

03-12-2024, 02:33 PM	#1
S65Hunter Major 1186 Rep 1,455 Posts Drives: 2009 E92 M3 Join Date: May 2018 Location: Dallas TX iTrader: (0) Garage List [0.00]	Noise coming from rear of car When I'm at a stop and roll forward or backwards, I hear a faint noise coming from the rear of the car that sounds like some one crinkcling an empty bag of chips. Weird comparison I know, but its pretty accurate. Any ideas on what this could be? I jacked the rear end up and turned the wheels by hand but no noise. __________________ 2008 328i e93- 3SIM, StageFP tune, magna flow #12148 muffler + vibrant resonator, BMS filters, Bilstein B8s, H&R sport springs, ECS sway bars, whiteline rear subframe bushings, rouge engineering trans mounts, custco front strut bar, M3 front lower control arms. Cosmis R1 18x8.5 245/40 front 18x9.5 255/35 rear.
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03-12-2024, 03:19 PM	#3
MineralWhiteF80 Dont listen to me 795 Rep 562 Posts Drives: F82, E92 M3, G30 M550i, E46 Join Date: Mar 2015 Location: Atlanta,Ga iTrader: (1)	you should try to repeat your test with the car sitting on all four tires and the transmission in neutral. Find a safe spot that is flat and quiet. Place the transmission in neutral, and then push the top of one of the rear tires to easily make the car roll forward and backward and listen for the noise. It's possible the noise is only present at standard ride height, but when jacked up off the ground the suspension/tire positions change the location of whatever is rubbing or making the noise. Maybe someone is locked in your trunk and just finished a bag chips? __________________ Instagram: @thatwhitem4
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03-12-2024, 08:45 PM	#5
Scrippy Lord Scrip 1813 Rep 3,013 Posts Drives: 2011 M3 Coupe Join Date: Jan 2012 Location: LA,Ca iTrader: (0) Garage List [0.00] 2007 BMW 335i [0.00]	Sometimes the rear heat shield comes in contact with the drive shaft. Being that it’s super thin aluminum it sounds like a bush or scrapping can noise kinda. Just pull it away from the drive shaft to gain at least 1/2” clearance. __________________
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03-12-2024, 10:27 PM	#6
krudmunk Captain 343 Rep 825 Posts Drives: F80 M3 Join Date: Apr 2020 Location: San Francisco iTrader: (3)	My muffler hanger weld competely deteriorated and separated and was making like brake squeak noise at cold start. This is the center metal hanger that the diffuser also attaches to. I didn’t know until I recently installed new exhaust. Probably not the exact same issue but might be worthwhile to check it out. Attached Images
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03-13-2024, 05:06 AM	#7
amrazM mTekMods 2142 Rep 2,902 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	cv joint __________________ 2011 Frozen Black/Fox Red E90 M3 650+WHP G-Power Supercharged First DCT to Manual Conversion Worldwide KW CS, BBS RI-A, BW Headers, Snow 2.5
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03-13-2024, 09:32 PM	#9
S65Hunter Major 1186 Rep 1,455 Posts Drives: 2009 E92 M3 Join Date: May 2018 Location: Dallas TX iTrader: (0) Garage List [0.00]	After listening to the video above. What would yall say the issue? __________________ 2008 328i e93- 3SIM, StageFP tune, magna flow #12148 muffler + vibrant resonator, BMS filters, Bilstein B8s, H&R sport springs, ECS sway bars, whiteline rear subframe bushings, rouge engineering trans mounts, custco front strut bar, M3 front lower control arms. Cosmis R1 18x8.5 245/40 front 18x9.5 255/35 rear.
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03-14-2024, 05:09 AM	#10
amrazM mTekMods 2142 Rep 2,902 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	which noise is it? the first noise sounds like the rotor on the backing plate the more faint noise sounds like the cv. __________________ 2011 Frozen Black/Fox Red E90 M3 650+WHP G-Power Supercharged First DCT to Manual Conversion Worldwide KW CS, BBS RI-A, BW Headers, Snow 2.5
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03-16-2024, 04:49 PM	#14
exVtekGuy Second Lieutenant 115 Rep 284 Posts Drives: none yet Join Date: Aug 2011 Location: Virginia iTrader: (0)	Could be small rock stuck between rotor and dust shield. I had that problem before.
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03-17-2024, 12:21 PM	#15
S65Hunter Major 1186 Rep 1,455 Posts Drives: 2009 E92 M3 Join Date: May 2018 Location: Dallas TX iTrader: (0) Garage List [0.00]	So far, you're correct. I took the brake rotor off, cleaned it really well on the inside since there was a bunch if build up. Sprayed the parking brake down with brake cleaner and a fine wire brush. The noise hasn't come back yet __________________ 2008 328i e93- 3SIM, StageFP tune, magna flow #12148 muffler + vibrant resonator, BMS filters, Bilstein B8s, H&R sport springs, ECS sway bars, whiteline rear subframe bushings, rouge engineering trans mounts, custco front strut bar, M3 front lower control arms. Cosmis R1 18x8.5 245/40 front 18x9.5 255/35 rear.
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