Thread: N54 Engine Woes
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      04-18-2014, 02:36 PM   #4
Stvee
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Drives: 2010 BMW 135i
Join Date: Apr 2014
Location: Harrisonburg, VA

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Quote:
Originally Posted by Spoolin Montego View Post
All plugs and coils done within last 5k miles. Walnut blasting last done at 45k, I have 88k now. I know it needs a walnut blast but I don't think it could cause such a severe misfire/limp mode as it never did before around 40k miles before I had it done for the first time. Oil changed 1k miles ago.

My friend thinks my piston rings are fried somehow because of the black smoke..Which I don't know how though, I mean I drive the car hard but I don't beat on it, never track it and it's never been overheated.
Black smoke means it's running rich (which means its getting too much fuel). I highly doubt your piston rings are fried. Maybe a bad o2 sensor?
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