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      05-16-2019, 11:53 AM   #1
whyagwj
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Metallic vibration sound at 1500RPM

I owned my 15 m3 for 1 year and the current mileage is 66000KM. I noticed this sound about a few weeks ago, I can hear the sound only at 1500 rpm and it sounds like sort of metallic vibration from underneath of the car. It doesn't appear to affect the performance of the car. Does anyone recognize this sound? Any solution to fix it?

Here is the sound clip

https://drive.google.com/file/d/1hVR...ew?usp=sharing

You can hear the sound at 0:03

Last edited by whyagwj; 05-16-2019 at 12:00 PM.. Reason: wrong info
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      05-16-2019, 11:56 AM   #2
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My car doesn't have that sound but it could be a million things. Hopefully somebody here has had the sound and knows what it could be, good luck.
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      05-16-2019, 02:13 PM   #3
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Do you have any exhaust mods ? Do it happen while stationary in neutral ? Or does it have to be under engine load ? Easiest way i guess is to have the vehicle in the air and trying to duplicate the noise while under the vehicle.
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      05-16-2019, 02:16 PM   #4
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Sounds like this
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      05-17-2019, 02:09 AM   #5
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I have a metallic rattling sound around 1950rpm. It only rattles between around 1950-2050rpm.

Tried shaking the MPE, checked the licence plates while on hoist but couldn't get it to rattle. Rattles when reving stationary and moving off.

I will be checking to see if its the wastegate rattle but I just don't see the sound coming from the front of the car.
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      05-17-2019, 03:04 AM   #6
M 4 FUN
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My car also rattles in the exhaust area, but only on colstart. As soon as it heats up a Little it disappears.
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      05-17-2019, 07:31 AM   #7
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Quote:
Originally Posted by M 4 FUN View Post
My car also rattles in the exhaust area, but only on colstart. As soon as it heats up a Little it disappears.
Same. Only on cold start. It seemed to be reduced after adding the AA midpipe.
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      05-17-2019, 05:10 PM   #8
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I had the same issue on my 16' 6MT. Took it in 3 times and they could not figure it out. It was so loud sounded like something was grinding in the rear. Fortunately started to go away on its own after 10k miles or so.
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      05-18-2019, 10:15 AM   #9
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Quote:
Originally Posted by M3 Pilot View Post
I have a metallic rattling sound around 1950rpm. It only rattles between around 1950-2050rpm.

Tried shaking the MPE, checked the licence plates while on hoist but couldn't get it to rattle. Rattles when reving stationary and moving off.

I will be checking to see if its the wastegate rattle but I just don't see the sound coming from the front of the car.
GTS has this as well, right in that rpm range. Under light acceleration in D the next gear grabs right under 2k rpm and I hear it with every upshift. It's coming from the muffler area for sure. Not like the gasket sound in the vid above

Not really a concern to me since it's 1 of 100 noises in the GTS. Would like to know what it is though.
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      05-18-2019, 11:34 AM   #10
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Did you turn cold start off with a tune? My AA mid and MPE exhaust back do the same thing even way worse when the car starts up with cold started turned off via tune. Once you drive around a bit and things get warmed up it goes away so hard to think itís actually something loose.
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      05-22-2019, 01:49 PM   #11
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I an definitely hearing a rattle or grind in the rear on cold start and also while I'm driving on slow speeds. But it slowly goes away when everything warms up. It's a bit annoying in the morning. Not sure what to do here.
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      06-15-2019, 06:01 AM   #12
ukbmwm4
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Did you find out what this noise was? my car does the exact same noise.

Quote:
Originally Posted by whyagwj View Post
I owned my 15 m3 for 1 year and the current mileage is 66000KM. I noticed this sound about a few weeks ago, I can hear the sound only at 1500 rpm and it sounds like sort of metallic vibration from underneath of the car. It doesn't appear to affect the performance of the car. Does anyone recognize this sound? Any solution to fix it?

Here is the sound clip

https://drive.google.com/file/d/1hVR...ew?usp=sharing

You can hear the sound at 0:03
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      01-19-2020, 04:21 PM   #13
RikiM2c
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Quote:
Originally Posted by whyagwj View Post
I owned my 15 m3 for 1 year and the current mileage is 66000KM. I noticed this sound about a few weeks ago, I can hear the sound only at 1500 rpm and it sounds like sort of metallic vibration from underneath of the car. It doesn't appear to affect the performance of the car. Does anyone recognize this sound? Any solution to fix it?

Here is the sound clip

https://drive.google.com/file/d/1hVR...ew?usp=sharing

You can hear the sound at 0:03
Hi,
I have the same problem on my M2 Competition!
Went to Bmw but they said that there’s nothing wrong with the car..
Did you find where the vibration sound came from?
Thanks you!
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      01-21-2020, 04:36 AM   #14
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Check your exhaust muffler for cracks.

MPE known to crack.

https://f80.bimmerpost.com/forums/sh...ight=mpe+crack
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