black soot in exhaust pipe 07 335i

Benny1012 · 05-21-2010, 05:49 PM

Occasionally see black smoke from right exhaust pipe, also with soot deposits in the same pipe. @$$#(0 mechanic said "its fine" but wouldnt that mean poor fuel/air mixture and/or bad injector? its not blue so I know its not oil. Guess I need a new mechanic.

aut0sh0cker · 05-21-2010, 06:14 PM

Atomized carbon aka "soot" is a product of the incomplete burning of hydrocarbons. It's normal for any car.

It appears much more quickly in the right tailpipe because there is a butterfly valve in the left one. GT mod will get rid of this.

jaco · 05-24-2010, 07:37 PM

Get use to it, turbo cars are more susceptible to this. I try and clean my tips weekly and they are never carbon free, doesnt help i have a heavy foot.

zzzbullseye · 05-24-2010, 08:47 PM

Polishing and waxing will help keep them clean. I usually wipe my tips with a microfiber towel every day in between washing to remove the minor buildup - doing this in combination with frequent waxing lessens the need for restorative polishing.

This thread has some good info on cleaning/polishing your chrome tips.

dcorn · 05-25-2010, 06:23 AM

Ever see a turbo'd civic or something? They always have a big black mark on the bumper around the exhaust. Same deal, its normal.

05-21-2010, 05:49 PM	#1
Benny1012 Registered 2 Rep 1 Posts Drives: 2007 335i Join Date: May 2010 Location: New York iTrader: (0)	black soot in exhaust pipe 07 335i Occasionally see black smoke from right exhaust pipe, also with soot deposits in the same pipe. @$$#(0 mechanic said "its fine" but wouldnt that mean poor fuel/air mixture and/or bad injector? its not blue so I know its not oil. Guess I need a new mechanic.
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05-21-2010, 06:14 PM	#2
aut0sh0cker meh 123 Rep 1,756 Posts Drives: E92 335i, 997.2 C4S Join Date: Jan 2008 Location: 91362 iTrader: (2)	Atomized carbon aka "soot" is a product of the incomplete burning of hydrocarbons. It's normal for any car. It appears much more quickly in the right tailpipe because there is a butterfly valve in the left one. GT mod will get rid of this.
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05-24-2010, 07:37 PM	#3
jaco Captain 44 Rep 598 Posts Drives: 2011 E90 M3 SSII Join Date: May 2010 Location: Indy iTrader: (2)	Get use to it, turbo cars are more susceptible to this. I try and clean my tips weekly and they are never carbon free, doesnt help i have a heavy foot. __________________ Jacob 2015 Chevy SS In 2011 E90 M3 DCT SSII Out
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05-24-2010, 08:47 PM	#4
zzzbullseye BMW Addict 101 Rep 792 Posts Drives: 2011 550i (F10) Join Date: Nov 2009 Location: St. Louis iTrader: (4)	Polishing and waxing will help keep them clean. I usually wipe my tips with a microfiber towel every day in between washing to remove the minor buildup - doing this in combination with frequent waxing lessens the need for restorative polishing. This thread has some good info on cleaning/polishing your chrome tips. __________________ '11 Black Sapphire F10 550i l ZSP l Avant Garde 20" M310
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05-25-2010, 06:23 AM	#5
dcorn Captain 77 Rep 940 Posts Drives: 2008 E90 335i Join Date: Dec 2009 Location: NoVA iTrader: (2)	Ever see a turbo'd civic or something? They always have a big black mark on the bumper around the exhaust. Same deal, its normal.
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