Start up rattle sound?

MTrezzz · 10-25-2013, 08:50 AM

Resolved!

yodlegern · 10-25-2013, 08:56 AM

Probably just a cold muffler that's warming up (if you have an aftermarket exhaust). Nothing to worry about IMO.

yodlegern · 10-25-2013, 09:14 AM

I would consider it. Has it recently started gettting fairly cold (under 50F) in your area? Or have you recently put on the exhaust?

yodlegern · 10-25-2013, 09:17 AM

Kind of sound like:
http://s167.photobucket.com/user/mac...f79fe.mp4.html ?

MTrezzz · 10-25-2013, 09:31 AM

The weather here is about 45-50 on a good day, then i did put a x-pipe, but then swapped back to oem. but after that on start up, my back side muffler area produced this rattle noise, but it goes away after warmed.

1MOREMOD · 10-25-2013, 09:39 AM

the dealer can probably diagnose better than someone here. i have a headache its annoying can you tell me why? im gonna go to the doctor.

Trip3's · 10-25-2013, 09:56 AM

Quote:

Originally Posted by MTrezzz

The weather here is about 45-50 on a good day, then i did put a x-pipe, but then swapped back to oem. but after that on start up, my back side muffler area produced this rattle noise, but it goes away after warmed.

I had the same thing, I just had it fixed yesterday. There are "isolator" bushings (rubber) that were worn.It's right above the x pipe support brace. They put spacers in and it's gone. Oddly enough it sounded like the rattle was coming from the right muffler. Hope this helps.

MFL · 10-25-2013, 12:26 PM

I had mine fixed last week, some lining was rattling against my exhaust. Lift it up, start it, get under and tighten it up.

Sal@AUTOcouture · 10-25-2013, 02:57 PM

Check your MPE for cracks. We've already found a few that had developed this issue.

Trip3's · 10-27-2013, 07:01 AM

Quote:

Originally Posted by MTrezzz

you spot on got this, the sound of mines came from the rear right side of the car or (muffler). with your situation did the rattle stop after warmed up?

Yes, it only really did it in the morning.

edwinm3 · 10-27-2013, 11:40 AM

Maybe the pipes don't have enough clearance and are sitting to close to something possibly a heat shield. Don't forget heat expansion, it rattles when cold and as soon as it gets hot and expands it stops making contact with whatever it's hitting. Exhaust tends to move and stick out a bit more towards the back when hot

Ronnydashore · 10-27-2013, 12:59 PM

If it goes away when warm then look for something that would make sense that on expansion it would go away. ie. Bolts that were tightened for your m exhaust or when they swapped to oem xpipe, was the weather much warmer? When it cools some of the bolts get loose since it contracts the metal. Get under and tighten the bolts.

The other suggestions make no sense as if it were the dampers or heat shield or any other rattling piece, it would get worse as it warms up and the piping expands, which would put it in even more contact with those pieces it may be hitting in that scenario. Go under and tighten all your bolts from the xpipe to the muffler and you will have found your problem go away

10-25-2013, 08:50 AM	#1
MTrezzz Major 198 Rep 1,406 Posts Drives: Lime Rock Edition Join Date: Jan 2013 Location: Long Island iTrader: (1)	Start up rattle sound? Resolved! Last edited by MTrezzz; 11-03-2013 at 07:36 AM..
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10-25-2013, 08:56 AM	#2
yodlegern Enlisted Member 0 Rep 32 Posts Drives: 2009 E92 M3 Join Date: Oct 2013 Location: Canada iTrader: (0)	Probably just a cold muffler that's warming up (if you have an aftermarket exhaust). Nothing to worry about IMO.
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10-25-2013, 09:14 AM	#3
yodlegern Enlisted Member 0 Rep 32 Posts Drives: 2009 E92 M3 Join Date: Oct 2013 Location: Canada iTrader: (0)	I would consider it. Has it recently started gettting fairly cold (under 50F) in your area? Or have you recently put on the exhaust?
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10-25-2013, 09:17 AM	#4
yodlegern Enlisted Member 0 Rep 32 Posts Drives: 2009 E92 M3 Join Date: Oct 2013 Location: Canada iTrader: (0)	Kind of sound like: http://s167.photobucket.com/user/mac...f79fe.mp4.html ?
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10-25-2013, 09:31 AM	#5
MTrezzz Major 198 Rep 1,406 Posts Drives: Lime Rock Edition Join Date: Jan 2013 Location: Long Island iTrader: (1)	The weather here is about 45-50 on a good day, then i did put a x-pipe, but then swapped back to oem. but after that on start up, my back side muffler area produced this rattle noise, but it goes away after warmed.
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10-25-2013, 09:39 AM	#6
1MOREMOD - 11817 Rep 23,187 Posts Drives: Race car-> Join Date: Mar 2009 Location: check your mirrors iTrader: (5)	the dealer can probably diagnose better than someone here. i have a headache its annoying can you tell me why? im gonna go to the doctor. __________________ 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\|
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10-25-2013, 12:26 PM	#8
MFL Major 174 Rep 1,246 Posts Drives: E92 M3 Join Date: Sep 2013 Location: Bellevue, WA iTrader: (3) Garage List 2010 BMW M3 [9.00]	I had mine fixed last week, some lining was rattling against my exhaust. Lift it up, start it, get under and tighten it up.
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10-25-2013, 02:57 PM	#9
Sal@AUTOcouture BimmerPost Supporting Vendor 733 Rep 10,105 Posts Drives: E93 M3, E36 M3 Join Date: Feb 2007 Location: Sofla iTrader: (30)	Check your MPE for cracks. We've already found a few that had developed this issue.
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10-27-2013, 11:40 AM	#11
edwinm3 Brigadier General 980 Rep 4,001 Posts Drives: F82 Join Date: Nov 2011 Location: Broward iTrader: (32)	Maybe the pipes don't have enough clearance and are sitting to close to something possibly a heat shield. Don't forget heat expansion, it rattles when cold and as soon as it gets hot and expands it stops making contact with whatever it's hitting. Exhaust tends to move and stick out a bit more towards the back when hot __________________ Grigio Telesto M4, 6MT. Coyote 5.0 F-150 991 GT3
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10-27-2013, 12:59 PM	#12
Ronnydashore Banned 5 Rep 54 Posts Drives: 2012 Silverstone M3 DCT Join Date: Oct 2013 Location: Hollywood iTrader: (0)	If it goes away when warm then look for something that would make sense that on expansion it would go away. ie. Bolts that were tightened for your m exhaust or when they swapped to oem xpipe, was the weather much warmer? When it cools some of the bolts get loose since it contracts the metal. Get under and tighten the bolts. The other suggestions make no sense as if it were the dampers or heat shield or any other rattling piece, it would get worse as it warms up and the piping expands, which would put it in even more contact with those pieces it may be hitting in that scenario. Go under and tighten all your bolts from the xpipe to the muffler and you will have found your problem go away
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