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      04-13-2012, 09:14 AM   #68
1speedbike
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Drives: 2022 X4 M40i, 2008 135i
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Quote:
Originally Posted by theinfamousdrew View Post
Sorry for being a n54 noob....

What are the symptoms of carbon build up?
I searched but cant find an answer
Reduced power, higher emissions, worse mileage. When it gets pretty bad, then the engine starts running rough. Rough idle, even shuddering sometimes.
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