BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > black soot in exhaust pipe 07 335i

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      05-21-2010, 05:49 PM   #1
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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
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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
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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.
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      05-24-2010, 08:47 PM   #4
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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.
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      05-25-2010, 06:23 AM   #5
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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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