Loud vibration on cold start

moonshine89 · 09-13-2018, 05:46 PM

Just as the titles says...anyone hear a loud 1-2sec vibration coming from the rear usually a few seconds after a cold start?

Sounds like a bolt from the exhaust vibrating against the heat shield or something. But only seems to be an issue after a cold start. I also have an MPE factory installed.

The vibration is quite annoying and somewhat embarrassing on a 80k+ car! Any input would be appreciated

Poiseuille · 09-13-2018, 06:49 PM

the infamous rear rotor dust shield rattle?

rblood303 · 09-13-2018, 06:57 PM

cracked cans!
warranty that shit!

moonshine89 · 09-13-2018, 07:04 PM

Quote:

Originally Posted by rblood303

cracked cans!
warranty that shit!

If they were cracked wouldn't they make the sound all the time? Not just on a cold start?

moonshine89 · 09-13-2018, 07:04 PM

Quote:

Originally Posted by Poiseuille

the infamous rear rotor dust shield rattle?

Definitely didn't think about that. I'll look into it. Anyone have a link of what it sounds like?

CigarPundit · 09-13-2018, 07:06 PM

I got the same thing and I HATE it. I even get it on warm starts sometimes. I’m checking to see if my AA exhaust is touching the brace, but if that’s not it, I’ll be heading the dealer for warranty trouble shooting. Drives me nuts, and is just so wrong on such a nice car. Let me know if you isolate the cause.

rblood303 · 09-14-2018, 01:57 AM

Quote:

Originally Posted by moonshine89

If they were cracked wouldn't they make the sound all the time? Not just on a cold start?

not necessarily. metal when cold is different to metal when hot

Poiseuille · 09-14-2018, 08:26 AM

Quote:

Originally Posted by moonshine89

Quote:

Originally Posted by Poiseuille

the infamous rear rotor dust shield rattle?

Definitely didn't think about that. I'll look into it. Anyone have a link of what it sounds like?

easy. get a long thin flat blade screwdriver, reach around the tire and lightly tap the dust shield, see if that doesn't sound familiar. might be easier to take the wheel off, but you can probably reach the shield with a long enough screwdriver.

uniqueMR · 09-14-2018, 09:41 AM

Have it check it out with dealer.
Most likely exhaust flaps opening and closing within few seconds. That's normal.

r0wr · 09-14-2018, 09:57 AM

Cracked MPE. I had the same issue. Calling it.

moonshine89 · 09-14-2018, 12:02 PM

Quote:

Originally Posted by r0wr

Cracked MPE. I had the same issue. Calling it.

Haha I'll check it today. I'll try to record while I start the car.

damageprone · 09-14-2018, 12:09 PM

Same thing happened to mine. My MPE sounded like a throaty cowbell at cold start. Dealer said it was a combination of stuck valves and cracked MPE.

The cracked MPE I could see. Warranty that now as they have the revised revision 04 MPE that's braced in the right places so it shouldn't happen again...hopefully.

I'm almost out of warranty and may need to brace the muffler on my own.

JayZap16 · 09-14-2018, 12:41 PM

I dont know if its the same noise but I have remus non res mid pipes on stock muffler. When I do cold starts with valves open after about 3 secs for a duration of 4-5 seconds it sounds like a someone is banging a empty steel drum with a hammer at a rate of 200 strikes per second, pierecing loud, have to plug my ears or close my valves. Then after about 10 seconds into the cold start cycle it disappears.

ssgm1x · 09-24-2018, 10:41 AM

I have loud rattle during cold start. I think it's coming from the exhaust valve flaps. It sounds like someone threw a roll of pennies down a garbage disposal and turned it on. SOOO loud!!!

moonshine89 · 09-27-2018, 09:40 PM

I actually figured mine out!

It's the right exhaust tip on the drivers side vibrating against the mp diffuser! I've noticed In a lot of pictures with the mp exhuast the pair of exhaust pipes on the driver side is too far to the right. I'm not sure if that's just an error with bmws instructions for install or installation error.

But I had to put some velcro or a soft pad on the inner curve of the carbon fiber diffuser and it stopped! I'm taking it to the dealership that installed it later this week. Hopefully adjusting the exhaust pipe position won't be too difficult.

I'll try to post some photos later.

duky · 09-30-2018, 08:35 AM

Quote:

Originally Posted by ssgm1x

I have loud rattle during cold start. I think it's coming from the exhaust valve flaps. It sounds like someone threw a roll of pennies down a garbage disposal and turned it on. SOOO loud!!!

Sounds Iike the standard, infamous f8x cold start

Brasko · 09-30-2018, 09:02 AM

It's part of the nuances of the MPE. I've had the MPE since day one on two different F80's and had the same experience. Don't sweat it!

ssgm1x · 09-30-2018, 09:29 AM

Ok the vibration on my car is not coming from the exhaust flaps. It's coming from the Exhaust tips. What a horrible design. Think I'm going to have to order different tips or try silencing these.

Alvinized52 · 09-30-2018, 09:30 AM

Mine does this too. The rattle only last about 1 min at start. Ive had cracked can before.... repaired them. But Sound still persist... i'm convince its the valve flaps, but dont know how to address it.

-cj- · 09-30-2018, 10:07 PM

My cold starts are a bit embarrassing... can't believe how loud it is.

I stepped out of the car one morning and watched my exhaust to see if it was hitting the diffuser like someone posted in this thread. It wasn't, but I was surprised by how much movement there was on the tail pipes! The whole exhaust was very visibly vibrating at an insane frequency. I'll try to take a video...

CigarPundit · 09-30-2018, 11:53 PM

I’m told my momentary rattle during cold start is the waste gates. Not sure if anything can be done about it, but I absolutely hate it.

moonshine89 · 09-30-2018, 11:57 PM

Mines more of a high frequency rattle followed by an even higher frequency buzzing intermittently. This all occurs for the first 30-60s and then it's gone. I assume the rattle might be the wastegates or valves. But the intermittent buzzing--I'm almost certain is the diffuser rubbing up against the carbon fiber tip. Is there an easy way to post video?

09-13-2018, 05:46 PM	#1
moonshine89 Second Lieutenant 152 Rep 269 Posts Drives: 18 M3 ZCP Join Date: Feb 2018 Location: United States iTrader: (1)	Loud vibration on cold start Just as the titles says...anyone hear a loud 1-2sec vibration coming from the rear usually a few seconds after a cold start? Sounds like a bolt from the exhaust vibrating against the heat shield or something. But only seems to be an issue after a cold start. I also have an MPE factory installed. The vibration is quite annoying and somewhat embarrassing on a 80k+ car! Any input would be appreciated
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09-13-2018, 06:49 PM	#2
Poiseuille Brigadier General 5393 Rep 3,737 Posts Drives: 2016 M4 DCT Tanzanite/Amaro Join Date: Oct 2016 Location: Princeton iTrader: (0) Garage List [0.00] [10.00]	the infamous rear rotor dust shield rattle?
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09-13-2018, 06:57 PM	#3
rblood303 Enlisted Member 23 Rep 39 Posts Drives: F80 M3 Join Date: Jan 2018 Location: Australia iTrader: (0)	cracked cans! warranty that shit!
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09-13-2018, 07:06 PM	#6
CigarPundit On the road to serfdom 1392 Rep 673 Posts Drives: 2018 F80 M3 DCT, 2019 Raptor Join Date: Jun 2018 Location: Los Angeles iTrader: (0) Garage List 2018 F80 M3 DCT [0.00]	I got the same thing and I HATE it. I even get it on warm starts sometimes. I’m checking to see if my AA exhaust is touching the brace, but if that’s not it, I’ll be heading the dealer for warranty trouble shooting. Drives me nuts, and is just so wrong on such a nice car. Let me know if you isolate the cause. __________________ "God bless our troops...Especially our snipers.”
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09-14-2018, 09:41 AM	#9
uniqueMR Colonel 1883 Rep 2,924 Posts Drives: ... Join Date: Dec 2017 Location: USA iTrader: (0)	Have it check it out with dealer. Most likely exhaust flaps opening and closing within few seconds. That's normal. __________________ Currently: '24 Mercedes G63 \| '24 Porsche GT3 RS \| '24 Volkswagen GTI Previous BMWs: 340i, 740i, 745Li, M3, M4 Previous Others: Audi, Ducati, Honda, Infiniti, Land Rover, Mercedes-Benz, MINI, Mitsubishi, Porsche, Toyota, Volkswagen
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09-14-2018, 09:57 AM	#10
r0wr Lieutenant 589 Rep 526 Posts Drives: Beater Join Date: Jan 2012 Location: Los Angeles, CA iTrader: (0)	Cracked MPE. I had the same issue. Calling it.
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09-14-2018, 12:09 PM	#12
damageprone Major 581 Rep 1,055 Posts Drives: Tesla Join Date: Mar 2017 Location: Casino iTrader: (1)	Same thing happened to mine. My MPE sounded like a throaty cowbell at cold start. Dealer said it was a combination of stuck valves and cracked MPE. The cracked MPE I could see. Warranty that now as they have the revised revision 04 MPE that's braced in the right places so it shouldn't happen again...hopefully. I'm almost out of warranty and may need to brace the muffler on my own. Last edited by damageprone; 09-14-2018 at 12:22 PM..
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09-14-2018, 12:41 PM	#13
JayZap16 Private First Class 105 Rep 136 Posts Drives: F82 M4, Merc GLE 63s, F90 M5 Join Date: Feb 2018 Location: Plymouth Michigan iTrader: (0)	I dont know if its the same noise but I have remus non res mid pipes on stock muffler. When I do cold starts with valves open after about 3 secs for a duration of 4-5 seconds it sounds like a someone is banging a empty steel drum with a hammer at a rate of 200 strikes per second, pierecing loud, have to plug my ears or close my valves. Then after about 10 seconds into the cold start cycle it disappears.
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09-24-2018, 10:41 AM	#14
ssgm1x Captain 419 Rep 771 Posts Drives: 2020 M340i & 2018 M3 Join Date: Aug 2017 Location: Cherry hill ,NJ iTrader: (0)	I have loud rattle during cold start. I think it's coming from the exhaust valve flaps. It sounds like someone threw a roll of pennies down a garbage disposal and turned it on. SOOO loud!!! __________________ 2020 BMW M340ix Dravit Grey 2018 BMW M3 Alpine White
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09-27-2018, 09:40 PM	#15
moonshine89 Second Lieutenant 152 Rep 269 Posts Drives: 18 M3 ZCP Join Date: Feb 2018 Location: United States iTrader: (1)	I actually figured mine out! It's the right exhaust tip on the drivers side vibrating against the mp diffuser! I've noticed In a lot of pictures with the mp exhuast the pair of exhaust pipes on the driver side is too far to the right. I'm not sure if that's just an error with bmws instructions for install or installation error. But I had to put some velcro or a soft pad on the inner curve of the carbon fiber diffuser and it stopped! I'm taking it to the dealership that installed it later this week. Hopefully adjusting the exhaust pipe position won't be too difficult. I'll try to post some photos later.
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09-30-2018, 09:02 AM	#17
Brasko #LSBM3 1420 Rep 1,973 Posts Drives: 2016 BMW M3 Join Date: Feb 2015 Location: Oregon / Florida iTrader: (4) Garage List 1984 BMW R65 [0.00] 2020 Ford F-150 XLT ... [0.00] 2003 Mitsubishi Evo ... [0.00] 2016 M3 Competition ... [10.00]	It's part of the nuances of the MPE. I've had the MPE since day one on two different F80's and had the same experience. Don't sweat it! __________________ /// M3
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09-30-2018, 09:29 AM	#18
ssgm1x Captain 419 Rep 771 Posts Drives: 2020 M340i & 2018 M3 Join Date: Aug 2017 Location: Cherry hill ,NJ iTrader: (0)	Ok the vibration on my car is not coming from the exhaust flaps. It's coming from the Exhaust tips. What a horrible design. Think I'm going to have to order different tips or try silencing these. __________________ 2020 BMW M340ix Dravit Grey 2018 BMW M3 Alpine White
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09-30-2018, 09:30 AM	#19
Alvinized52 @ste4lthedF82 882 Rep 1,498 Posts Drives: 2016 M4 SSII Join Date: Sep 2015 Location: Los Angeles iTrader: (1) Garage List 2016 BMW M4 [10.00]	Mine does this too. The rattle only last about 1 min at start. Ive had cracked can before.... repaired them. But Sound still persist... i'm convince its the valve flaps, but dont know how to address it. __________________ 2016 Satin SSII M4 (Instagram: @Ste4lthedF82) see my featured mods below... http://f80.bimmerpost.com/forums/sho....php?t=1197842 Last edited by Alvinized52; 09-30-2018 at 10:21 PM..
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09-30-2018, 10:07 PM	#20
-cj- Captain 199 Rep 799 Posts Drives: '20 X5MC \| '20 Z4 Join Date: Dec 2011 Location: Toronto iTrader: (3)	My cold starts are a bit embarrassing... can't believe how loud it is. I stepped out of the car one morning and watched my exhaust to see if it was hitting the diffuser like someone posted in this thread. It wasn't, but I was surprised by how much movement there was on the tail pipes! The whole exhaust was very visibly vibrating at an insane frequency. I'll try to take a video... __________________ Current: <pending> \| '20 Z4 M40i Past: 09 M3 Coupe DCT (sold) \| 11 1M Coupe MT (sold) \| 15 i3 REX (returned) \| 15 X3 35xi (sold) \| 16 M235xi Vert (returned) \| 18 M3 Comp Ultimate DCT (sold) \| 20 X5 M Comp (totalled)
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09-30-2018, 11:53 PM	#21
CigarPundit On the road to serfdom 1392 Rep 673 Posts Drives: 2018 F80 M3 DCT, 2019 Raptor Join Date: Jun 2018 Location: Los Angeles iTrader: (0) Garage List 2018 F80 M3 DCT [0.00]	I’m told my momentary rattle during cold start is the waste gates. Not sure if anything can be done about it, but I absolutely hate it. __________________ "God bless our troops...Especially our snipers.”
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09-30-2018, 11:57 PM	#22
moonshine89 Second Lieutenant 152 Rep 269 Posts Drives: 18 M3 ZCP Join Date: Feb 2018 Location: United States iTrader: (1)	Mines more of a high frequency rattle followed by an even higher frequency buzzing intermittently. This all occurs for the first 30-60s and then it's gone. I assume the rattle might be the wastegates or valves. But the intermittent buzzing--I'm almost certain is the diffuser rubbing up against the carbon fiber tip. Is there an easy way to post video?
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