Rattle From Exhaust?

Guvernator · 02-06-2013, 04:35 AM

I've had an annoying problem for a while which I've decided I now need to do something about. Whenever I pull away I get a slight zinging rattle from what sounds like the Exhaust.

This only seems to happen at between 1000-2000rpm and then goes away as the revs rise. The fact that it only happens at those revs makes me think it's either the exhaust valve flaps or the exhaust resonating against something at a certain frequency.

There doesn't seem to be any excess movement from the exhaust though so any ideas what this might be?

nicktyler · 02-06-2013, 05:18 AM

This sounds like the dreaded wastegate rattle. There is lots of info on this if you do a quick search.

On the other hand it might just be a loose heat shield.

coopersim · 02-06-2013, 05:41 AM

I had a very similar problem, turned out it was grit and small stones stuck in the chrome exhaust trim - depending on the type it either pulls off or has a grub screw underneath.

N8N · 02-06-2013, 06:02 AM

My tailpipe flap rattles, it sounds like hell.

N8N · 02-06-2013, 06:02 AM

My tailpipe flap rattles, it sounds like hell.

N8N · 02-06-2013, 06:02 AM

My tailpipe flap rattles, it sounds like hell.

N8N · 02-06-2013, 06:02 AM

My tailpipe flap rattles, it sounds like hell.

N8N · 02-06-2013, 06:02 AM

My tailpipe flap rattles, it sounds like hell.

N8N · 02-06-2013, 06:02 AM

My tailpipe flap rattles, it sounds like hell.

N8N · 02-06-2013, 06:03 AM

My tailpipe flap rattles, it sounds like hell.

hobo mofo · 02-06-2013, 06:26 AM

i'd say your heat sheild is loose.

Barlows · 02-06-2013, 07:23 AM

Quote:

Originally Posted by N8N

My tailpipe flap rattles, it sounds like hell.

Quote:

Originally Posted by N8N

My tailpipe flap rattles, it sounds like hell.

Quote:

Originally Posted by N8N

My tailpipe flap rattles, it sounds like hell.

Quote:

Originally Posted by N8N

My tailpipe flap rattles, it sounds like hell.

Quote:

Originally Posted by N8N

My tailpipe flap rattles, it sounds like hell.

Quote:

Originally Posted by N8N

My tailpipe flap rattles, it sounds like hell.

Quote:

Originally Posted by N8N

My tailpipe flap rattles, it sounds like hell.

Sounds like...

nicktyler · 02-06-2013, 07:26 AM

OK N8N we get it

Mine does as well but only for 30 secs on cold start up.

phil200tdi · 02-06-2013, 10:59 AM

You can check whether its your exhaust flap by doing the golf tee mod:

nicktyler · 02-06-2013, 11:09 AM

I did the golf tee mod and it made little difference. Only the pitch of the rattle changed.

Guvernator · 02-07-2013, 03:49 AM

Don't think it's a wastegate rattle as it's not coming from the engine bay, it's coming from the rear of the car and definitely sounds like something to do with the exhaust. Either the flap inside or the exhaust vibrating against something. It's quite faint and only audible for a second or two as you pull away from a standstill but it does it every time I pull away so I've finally decided to try to solve the mystery.

I'll try the Golf tee mod to see if this changes anything, failing that I'll get the car up on a ramp to see if anything is moving. The car is under warranty but I find dealers are pretty useless at finding\dealing with rattles and creaks.

02-06-2013, 04:35 AM	#1
Guvernator Captain 18 Rep 617 Posts Drives: BMW 335i SE Cabriolet Join Date: Mar 2012 Location: LONDON iTrader: (0)	Rattle From Exhaust? I've had an annoying problem for a while which I've decided I now need to do something about. Whenever I pull away I get a slight zinging rattle from what sounds like the Exhaust. This only seems to happen at between 1000-2000rpm and then goes away as the revs rise. The fact that it only happens at those revs makes me think it's either the exhaust valve flaps or the exhaust resonating against something at a certain frequency. There doesn't seem to be any excess movement from the exhaust though so any ideas what this might be?
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02-06-2013, 05:18 AM	#2
nicktyler Major 32 Rep 1,271 Posts Drives: 335i (sadly gone) Join Date: Jan 2012 Location: Essex iTrader: (3) Garage List 2007 BMW E92 335i [0.00]	This sounds like the dreaded wastegate rattle. There is lots of info on this if you do a quick search. On the other hand it might just be a loose heat shield.
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02-06-2013, 05:41 AM	#3
coopersim Captain 75 Rep 879 Posts Drives: 420d Join Date: Apr 2009 Location: Glos. iTrader: (2)	I had a very similar problem, turned out it was grit and small stones stuck in the chrome exhaust trim - depending on the type it either pulls off or has a grub screw underneath.
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02-06-2013, 06:02 AM	#4
N8N Lieutenant Colonel 168 Rep 1,843 Posts Drives: 2009 E92 335i 6MT Join Date: Sep 2012 Location: Berwyn Heights, MD iTrader: (2)	My tailpipe flap rattles, it sounds like hell.
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02-06-2013, 06:02 AM	#5
N8N Lieutenant Colonel 168 Rep 1,843 Posts Drives: 2009 E92 335i 6MT Join Date: Sep 2012 Location: Berwyn Heights, MD iTrader: (2)	My tailpipe flap rattles, it sounds like hell.
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02-06-2013, 06:03 AM	#10
N8N Lieutenant Colonel 168 Rep 1,843 Posts Drives: 2009 E92 335i 6MT Join Date: Sep 2012 Location: Berwyn Heights, MD iTrader: (2)	My tailpipe flap rattles, it sounds like hell.
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02-06-2013, 06:26 AM	#11
hobo mofo Captain 26 Rep 639 Posts Drives: 2007 325i e90 Join Date: Apr 2012 Location: London iTrader: (1)	i'd say your heat sheild is loose.
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02-06-2013, 07:26 AM	#13
nicktyler Major 32 Rep 1,271 Posts Drives: 335i (sadly gone) Join Date: Jan 2012 Location: Essex iTrader: (3) Garage List 2007 BMW E92 335i [0.00]	OK N8N we get it Mine does as well but only for 30 secs on cold start up.
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02-06-2013, 10:59 AM	#14
phil200tdi Colonel 112 Rep 2,621 Posts Drives: 335i M Sport E90 LCI manual Join Date: Jan 2011 Location: Aylesbury iTrader: (1)	You can check whether its your exhaust flap by doing the golf tee mod: __________________ Car: e91 330d with Viezu map Gone but not forgotten: 2010 Jaguar XFR (Cat-back exhaust, pulley, intake mods and map), Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)
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02-06-2013, 11:09 AM	#15
nicktyler Major 32 Rep 1,271 Posts Drives: 335i (sadly gone) Join Date: Jan 2012 Location: Essex iTrader: (3) Garage List 2007 BMW E92 335i [0.00]	I did the golf tee mod and it made little difference. Only the pitch of the rattle changed.
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02-07-2013, 03:49 AM	#16
Guvernator Captain 18 Rep 617 Posts Drives: BMW 335i SE Cabriolet Join Date: Mar 2012 Location: LONDON iTrader: (0)	Don't think it's a wastegate rattle as it's not coming from the engine bay, it's coming from the rear of the car and definitely sounds like something to do with the exhaust. Either the flap inside or the exhaust vibrating against something. It's quite faint and only audible for a second or two as you pull away from a standstill but it does it every time I pull away so I've finally decided to try to solve the mystery. I'll try the Golf tee mod to see if this changes anything, failing that I'll get the car up on a ramp to see if anything is moving. The car is under warranty but I find dealers are pretty useless at finding\dealing with rattles and creaks.
	Appreciate 0 Quote

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