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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

  • Welcome to Motor Vehicle Maintenance & Repair! Which engine is in the car? If this is the 2L turbo motor, you may have a pressure leak on the high pressure cold side of the intake tract, or an issue with the turbocharger itself. Either way, you'd have a loss of intake charge which would lead to a rich condition, and thus the black smoke. – Pᴀᴜʟsᴛᴇʀ2 Oct 2 '18 at 14:12
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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

  • Could it be the turbo or is that highly unlickly – Elias Oct 4 '18 at 19:54
  • @Elias: Turbo is one of many places where oil can leak. Also what Paulster2 said, so yes could be the turbo. Does it have low Power? – Daniel Oct 8 '18 at 17:02

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