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I got my BMW recently where the previous owner did not drive the car for a while not less than 2 month but noticed when accelerating black smoke was coming out of the exhaust should this make me worry

Pᴀᴜʟsᴛᴇʀ2
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Elias
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2 Answers2

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It could be a number of things.

If it is really a black smoke, it points to a fuel-rich mixture. Could be a problem with your fuel system or your Airflow and O2 sensors. Normally you should see an error code for most of this over OBD2.

If it is more of a blue-ish smoke, you could have a problem with oil leaking into the combustion chambers. Not unusual for BMW which where pushed while still cold.

Reference: Exhaust Color Diagnosis

Daniel
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I have 2008 535d lci model with e60 . I recently had black smoke issue. Mine was split turbo boost hose apparently it happens alot. Replaced and now it prring like a kitten again.

Hope that helps

andy
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