Soot on the exhaust pipes

Greck · 09-30-2016, 10:06 AM

Hi again,

I noticed that most of the 335d and X35d have really clean exhaust pipes, but mine are black... I can clean it and next day it is still OK, but after one week or so it is black again... I checked the intake and engine valves and they are clean, so no carbon there. What can be the cause of extra soot?

Thank you.

Delta0311 · 09-30-2016, 10:08 AM

I have yet to see a 335 (petrol or diesel) with no soot on the exhaust pipes.

Greck · 09-30-2016, 10:57 AM

here is what I catch:

X35d + 335d

chenry · 09-30-2016, 11:03 AM

My solution is gloss black msport rear diffuser...paired with 4" black Cyba tips :-) works like a charm

Okay kidding aside mine is really okay for a week or so it seems...but take a long road trip and I can write my name on the rear bumper with my finger

Delta0311 · 09-30-2016, 11:05 AM

Quote:

Originally Posted by Greck

here is what I catch:

X35d + 335d

100% normal.

Greck · 09-30-2016, 11:12 AM

Here is my car, I don't have another picture, but even from here you can see that it is dark...

dmanb2b · 09-30-2016, 01:40 PM

Quote:

Originally Posted by Greck

Here is my car, I don't have another picture, but even from here you can see that it is dark...

Mine looks exactly like yours..

Greck · 09-30-2016, 02:11 PM

Quote:

Originally Posted by dmanb2b

Mine looks exactly like yours...I should say "looked"

, I am now running iaknown's exhaust

Did you have any issues with DPF or SCR because of this soot?

Hoooper · 09-30-2016, 02:34 PM

Mine looked just like that. No issues with any of the emissions items.

dmanb2b · 09-30-2016, 03:51 PM

Quote:

Originally Posted by Greck

Did you have any issues with DPF or SCR because of this soot?

zero engine codes and no issues.

Greck · 09-30-2016, 03:57 PM

Thank you guys, it means that soot is not the cause of SCR Cat failure...

geost · 10-01-2016, 01:30 PM

My tips look like that. Put me in the "normal' camp as well, no problems here.

Greck · 10-03-2016, 10:09 AM

Yesterday I saw one more 335d with 120k and pipes are clean, so there should be a reason why I have more soot than others. I guess I have to measure the compression in the cylinders to make sure that engine is fine, if compression is good, than it probably because of DPF? What do you think?

babyfaby · 10-05-2016, 06:34 AM

Hi,
My 330d had very clean exhaust pipes till 145k km. From 2k km exhausts are soot covered and i don't know from where it's coming. Engine and car drive like a charm anyway.
No explainations...

natefank · 10-05-2016, 02:22 PM

I meet up with Greck the other day and his did have noticeable soot on his pipes. I wiped the inside with my finger and had soot on it, went over to my car and wiped the inside and dint have anything. It may not look like it in the pics but he does have soot in his exhaust

babyfaby · 10-05-2016, 03:32 PM

What's your mileage?

Greck · 10-05-2016, 03:40 PM

Mine is 113 and natefank's as I remember 120+

babyfaby · 10-08-2016, 06:21 AM

I've no idea, engine works fine, no code.

Greck · 10-09-2016, 10:23 PM

Quote:

Originally Posted by babyfaby

Hi,
My 330d had very clean exhaust pipes till 145k km. From 2k km exhausts are soot covered and i don't know from where it's coming. Engine and car drive like a charm anyway.
No explainations...

It is probably 330d doesn't have SCR system and I really happy that you don't have it...

babyfaby · 10-10-2016, 10:17 AM

Quote:

Originally Posted by Greck

It is probably 330d doesn't have SCR system and I really happy that you don't have it...

You're right, this is a 2007 330d E92, and it doesn't have SCR system. But SCR is more for NOx reduction than soot reduction (Particule Filter does).

Greck · 10-10-2016, 10:26 AM

If you have soot = SCR problems

Hoooper · 10-11-2016, 11:36 AM

Actually the scr shouldn't really impact soot except for maybe catching some in the media, the scr is only meant to convert nox. Soot is dealt with in the dpf and partially I guess in the doc.

09-30-2016, 10:06 AM	#1
Greck Second Lieutenant 59 Rep 245 Posts Drives: e90 2011 335d / e70 2011 35d Join Date: Jul 2016 Location: CA, Bay Area iTrader: (0)	Soot on the exhaust pipes Hi again, I noticed that most of the 335d and X35d have really clean exhaust pipes, but mine are black... I can clean it and next day it is still OK, but after one week or so it is black again... I checked the intake and engine valves and they are clean, so no carbon there. What can be the cause of extra soot? Thank you.
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09-30-2016, 10:08 AM	#2
Delta0311 Banned 7478 Rep 10,120 Posts Drives: 2011 BMW 335xi E92 2016 228xi Join Date: Apr 2009 Location: NJ iTrader: (1)	I have yet to see a 335 (petrol or diesel) with no soot on the exhaust pipes.
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09-30-2016, 10:57 AM	#3
Greck Second Lieutenant 59 Rep 245 Posts Drives: e90 2011 335d / e70 2011 35d Join Date: Jul 2016 Location: CA, Bay Area iTrader: (0)	here is what I catch: X35d + 335d Attached Images
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09-30-2016, 11:03 AM	#4
chenry Colonel 2358 Rep 2,964 Posts Drives: BMWs Join Date: Feb 2012 Location: SoCal Huntington Beach iTrader: (8)	My solution is gloss black msport rear diffuser...paired with 4" black Cyba tips :-) works like a charm Okay kidding aside mine is really okay for a week or so it seems...but take a long road trip and I can write my name on the rear bumper with my finger
	Appreciate 0 Quote

09-30-2016, 11:12 AM	#6
Greck Second Lieutenant 59 Rep 245 Posts Drives: e90 2011 335d / e70 2011 35d Join Date: Jul 2016 Location: CA, Bay Area iTrader: (0)	Here is my car, I don't have another picture, but even from here you can see that it is dark... Attached Images
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09-30-2016, 02:34 PM	#9
Hoooper Colonel 213 Rep 2,210 Posts Drives: 335D Join Date: Jun 2013 Location: Petaluma, CA iTrader: (0)	Mine looked just like that. No issues with any of the emissions items.
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09-30-2016, 03:57 PM	#11
Greck Second Lieutenant 59 Rep 245 Posts Drives: e90 2011 335d / e70 2011 35d Join Date: Jul 2016 Location: CA, Bay Area iTrader: (0)	Thank you guys, it means that soot is not the cause of SCR Cat failure...
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10-01-2016, 01:30 PM	#12
geost Second Lieutenant 42 Rep 281 Posts Drives: 2011 335d M Sport Join Date: Feb 2014 Location: NorCal iTrader: (1)	My tips look like that. Put me in the "normal' camp as well, no problems here. __________________
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10-03-2016, 10:09 AM	#13
Greck Second Lieutenant 59 Rep 245 Posts Drives: e90 2011 335d / e70 2011 35d Join Date: Jul 2016 Location: CA, Bay Area iTrader: (0)	Yesterday I saw one more 335d with 120k and pipes are clean, so there should be a reason why I have more soot than others. I guess I have to measure the compression in the cylinders to make sure that engine is fine, if compression is good, than it probably because of DPF? What do you think?
	Appreciate 0 Quote

10-05-2016, 06:34 AM	#14
babyfaby Private 15 Rep 97 Posts Drives: 530D G30/Z4 E86 3.0SI/320i E30 Join Date: Jan 2006 Location: Paris iTrader: (0)	Hi, My 330d had very clean exhaust pipes till 145k km. From 2k km exhausts are soot covered and i don't know from where it's coming. Engine and car drive like a charm anyway. No explainations... Last edited by babyfaby; 10-08-2016 at 06:27 AM..
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10-05-2016, 02:22 PM	#15
natefank Private First Class 8 Rep 106 Posts Drives: 335d Join Date: Mar 2014 Location: Santa Cruz, CA iTrader: (0)	I meet up with Greck the other day and his did have noticeable soot on his pipes. I wiped the inside with my finger and had soot on it, went over to my car and wiped the inside and dint have anything. It may not look like it in the pics but he does have soot in his exhaust
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10-05-2016, 03:32 PM	#16
babyfaby Private 15 Rep 97 Posts Drives: 530D G30/Z4 E86 3.0SI/320i E30 Join Date: Jan 2006 Location: Paris iTrader: (0)	What's your mileage?
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10-05-2016, 03:40 PM	#17
Greck Second Lieutenant 59 Rep 245 Posts Drives: e90 2011 335d / e70 2011 35d Join Date: Jul 2016 Location: CA, Bay Area iTrader: (0)	Mine is 113 and natefank's as I remember 120+
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10-08-2016, 06:21 AM	#18
babyfaby Private 15 Rep 97 Posts Drives: 530D G30/Z4 E86 3.0SI/320i E30 Join Date: Jan 2006 Location: Paris iTrader: (0)	I've no idea, engine works fine, no code.
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10-10-2016, 10:26 AM	#21
Greck Second Lieutenant 59 Rep 245 Posts Drives: e90 2011 335d / e70 2011 35d Join Date: Jul 2016 Location: CA, Bay Area iTrader: (0)	If you have soot = SCR problems
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10-11-2016, 11:36 AM	#22
Hoooper Colonel 213 Rep 2,210 Posts Drives: 335D Join Date: Jun 2013 Location: Petaluma, CA iTrader: (0)	Actually the scr shouldn't really impact soot except for maybe catching some in the media, the scr is only meant to convert nox. Soot is dealt with in the dpf and partially I guess in the doc.
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