BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing
 
INDustry distribution
Post Reply
 
Thread Tools Search this Thread
      08-24-2014, 04:56 PM   #1
SilentAttack
Lieutenant Colonel
SilentAttack's Avatar
100
Rep
1,793
Posts

Drives: 08 E90 Jerez Black 6MT
Join Date: Nov 2011
Location: Nashville, TN

iTrader: (0)

E90 M3 exhaust Leak?

So recently I added ACM test pipes to my car and all went well besides me not removing the stock cat bracket so I had a rattling noise at low rpm and idle. So this weekend I decided to take some time and remove the bracket and when doing so I re adjusted the clamp a little. Well today was the first time taking out the car and I notice this ticking noise and I can really only hear it well at low rpm when barley pressing the throttle or inbetween shifting gears as the rpm drops or when I turn my wheel like the video I took shows. Any thoughts on this? I notice the factory x-pipe didnt have a gasket but just figured it was normal as the rest of the exhaust just connects with clamps too. Thought... Comments would be appreciated.

__________________
Stupid Photobucket
Appreciate 0
      08-24-2014, 05:49 PM   #2
BrewRifle
Lieutenant Colonel
BrewRifle's Avatar
United_States
392
Rep
1,674
Posts

Drives: 2011 MCB E92 M3
Join Date: Jun 2013
Location: Austin, Texas

iTrader: (4)

Garage List
2011 BMW M3  [3.78]
2013 BMW X3 35i  [0.00]
2009 BMW 135i  [4.00]
Do you notice that noise when you are just idling or just when under a small amount of throttle?
__________________
2011 Monte Carlo Blue E92 ///M3 - ESS VT2-625
Appreciate 0
      08-24-2014, 05:57 PM   #3
SilentAttack
Lieutenant Colonel
SilentAttack's Avatar
100
Rep
1,793
Posts

Drives: 08 E90 Jerez Black 6MT
Join Date: Nov 2011
Location: Nashville, TN

iTrader: (0)

Quote:
Originally Posted by BrewRifle
Do you notice that noise when you are just idling or just when under a small amount of throttle?
It doesn't make the noise when idling. It's only at light throttle but more noticeable between gear change or coming to a stop while in a low gear
__________________
Stupid Photobucket
Appreciate 0
      08-24-2014, 05:59 PM   #4
BrewRifle
Lieutenant Colonel
BrewRifle's Avatar
United_States
392
Rep
1,674
Posts

Drives: 2011 MCB E92 M3
Join Date: Jun 2013
Location: Austin, Texas

iTrader: (4)

Garage List
2011 BMW M3  [3.78]
2013 BMW X3 35i  [0.00]
2009 BMW 135i  [4.00]
Hmm, interesting. My car sounds very similar to yours while you were idling there in that video (ticking that quiets up after it's gets to proper temperature), but I always assumed that was valve train noise not exhaust. Have you gotten a CEL light? I would assume that if you had a leak at the header/xpipe that it would throw a CEL after awhile.
__________________
2011 Monte Carlo Blue E92 ///M3 - ESS VT2-625

Last edited by BrewRifle; 08-24-2014 at 06:08 PM..
Appreciate 0
      08-24-2014, 10:22 PM   #5
SilentAttack
Lieutenant Colonel
SilentAttack's Avatar
100
Rep
1,793
Posts

Drives: 08 E90 Jerez Black 6MT
Join Date: Nov 2011
Location: Nashville, TN

iTrader: (0)

Ok so I just got got back from my cousins shop where he was nice enough to let me use his lift. It was an exhaust leak. The issue I had was with the band clamps. So the best way to explain it besides tightening them too much is there is a sleeve that tightens another sleeve on the inside of the clapm. Well the inside sleeve got un aligned when I was cranking down on it and wallah it bent, infact I must have hulked the passenger side because I actually bent the stock section in a near V shape.
__________________
Stupid Photobucket
Appreciate 0
      08-25-2014, 09:05 AM   #6
BrewRifle
Lieutenant Colonel
BrewRifle's Avatar
United_States
392
Rep
1,674
Posts

Drives: 2011 MCB E92 M3
Join Date: Jun 2013
Location: Austin, Texas

iTrader: (4)

Garage List
2011 BMW M3  [3.78]
2013 BMW X3 35i  [0.00]
2009 BMW 135i  [4.00]
Can you post a video from the same spot with the exhaust leak fixed?
__________________
2011 Monte Carlo Blue E92 ///M3 - ESS VT2-625
Appreciate 0
      08-25-2014, 09:41 PM   #7
SilentAttack
Lieutenant Colonel
SilentAttack's Avatar
100
Rep
1,793
Posts

Drives: 08 E90 Jerez Black 6MT
Join Date: Nov 2011
Location: Nashville, TN

iTrader: (0)

Quote:
Originally Posted by BrewRifle
Can you post a video from the same spot with the exhaust leak fixed?
It's not 100% fixed unless I get a new clamp as I bent the inner sleeve of the ones ACM provides.

__________________
Stupid Photobucket
Appreciate 0
      08-25-2014, 10:29 PM   #8
Devant
Banned
8
Rep
104
Posts

Drives: '11 M3
Join Date: Aug 2014
Location: NYC

iTrader: (0)

doesn sound so hot.
Appreciate 0
      08-25-2014, 10:42 PM   #9
SilentAttack
Lieutenant Colonel
SilentAttack's Avatar
100
Rep
1,793
Posts

Drives: 08 E90 Jerez Black 6MT
Join Date: Nov 2011
Location: Nashville, TN

iTrader: (0)

Quote:
Originally Posted by Devant
doesn sound so hot.
Because it's a cold start...
__________________
Stupid Photobucket
Appreciate 0
      08-25-2014, 10:46 PM   #10
s85e90
Brigadier General
173
Rep
3,637
Posts

Drives: black e90
Join Date: Jan 2014
Location: everywhere

iTrader: (2)

Ticking is normal and on a cold start it will sound like it has an exhaust leak for sure (sounds like a header gasket leak), but you're also running test pipes so you now have an additional breach in the pipes which require that sleeved clamp (which is a fine clamping setup).

Best way to check for a leak there? Since the car will warm up quick put the car up in the air cold and start it. Put your hands around the pipes and you'll be able to tell right away if there's a leak as you'll feel the exhaust escaping.
Appreciate 0
      08-29-2014, 12:08 PM   #11
SilentAttack
Lieutenant Colonel
SilentAttack's Avatar
100
Rep
1,793
Posts

Drives: 08 E90 Jerez Black 6MT
Join Date: Nov 2011
Location: Nashville, TN

iTrader: (0)

Quote:
Originally Posted by s85e90
Ticking is normal and on a cold start it will sound like it has an exhaust leak for sure (sounds like a header gasket leak), but you're also running test pipes so you now have an additional breach in the pipes which require that sleeved clamp (which is a fine clamping setup).

Best way to check for a leak there? Since the car will warm up quick put the car up in the air cold and start it. Put your hands around the pipes and you'll be able to tell right away if there's a leak as you'll feel the exhaust escaping.
I orderd another set of exhaust clamps since I bent the first ones. I sure hope it's not a header gasket leak.
__________________
Stupid Photobucket
Appreciate 0
      09-02-2014, 07:36 PM   #12
s85e90
Brigadier General
173
Rep
3,637
Posts

Drives: black e90
Join Date: Jan 2014
Location: everywhere

iTrader: (2)

Quote:
Originally Posted by SilentAttack View Post
I orderd another set of exhaust clamps since I bent the first ones. I sure hope it's not a header gasket leak.
No I was referring to what a normal cold start sounds like on this car= header gasket leak.
Appreciate 0
      06-29-2017, 11:44 PM   #13
E92friendly
Private First Class
United_States
39
Rep
130
Posts

Drives: E9x m3 sexiness
Join Date: Mar 2017
Location: Bay area

iTrader: (2)

This is an old thread sorry to resurrect this back up I also have an exhaust leak sound on cold start. It's very loud and annoying well it sounds like an exhaust leak as explained above. I had it on a lift and looked around to me on a cold start with my ears against eh exhaust it sounded like a very loud echo inside the catalytic converters. I inspected the heads and did not see any burn marks of signs of exhaust leak so that isn't an issue. Again, is sounds like a very loud echo in the Cats, it does this on cold start and continues at idle when a bit warmed up. When completely warmed it's quiet. However, when first taking off I hear it still temporary low Rpms. Any thoughts to share please share.
Appreciate 0
      07-01-2017, 02:49 PM   #14
Solo_M_Tech
Colonel
Solo_M_Tech's Avatar
United_States
1360
Rep
2,914
Posts

Drives: E90 M3 6MT
Join Date: Nov 2013
Location: Central Florida

iTrader: (5)

Garage List
2008 BMW M3  [5.00]
test pipes always leak if you use clamps. Weld them on or get a full x pipe.
__________________
2008 E90, JB/FR
APEX / ECS / AFE / BORLA / Brembo / ESS / H&R / IND
Insta: @M_POWER_S65
Appreciate 0
      09-06-2018, 09:25 PM   #15
SilverE92
Private First Class
9
Rep
111
Posts

Drives: 2008 BMW M3
Join Date: Jun 2016
Location: NC

iTrader: (3)

Apologize for bringing this back up but for some reason I can't view the youtube videos posted. I too believe I may have an exhaust leak but want to hear what you were experiencing before trying to fix it. Do you happen to still have that video?
Appreciate 0
      11-07-2019, 08:56 AM   #16
954MM
奈良シカマル
954MM's Avatar
United_States
380
Rep
363
Posts

Drives: 2011 Space Gray E90 M3
Join Date: Oct 2016
Location: Broward County, FL

iTrader: (0)

Just wanted to resurrect this thread to provide people with the solution. Its the exhaust gaskets between the headers and primaries.

On cold starts, my car would turn over, then sound like it was falling it face before slowly kicking in. It sounded like a cammed LS.

It was showing signs similar to a bad ICV or actuators. Car has stalled a few times before. 2 weeks ago the car went into limo mode. I shut it off, started it and it was fine. Didnt throw codes either. Ive gotten the "increased emissions" warning 3x as well. Whenever I would scan the car, I sometimes got O2 sensor errors.

Also on cold starts, after it would cycle, after roughly 5 seconds it would start again.

If you have a DCT car like me and you heard a pop when downshifting, thats another sign too.

After replacing these gaskets, the car starts up beautifully like it should. Its like the car was congested. Exhaust note also sounds smoother and less twangy.

Heres the part # 11627830668

Replacing it is very simple. Max time, an hour. Hope this helps.
__________________


http://954mm.com

IG: @954MM/@954M3
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 11:53 PM.




m3post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST