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black smoke from the exhaust may suggest the engine is running rich, meaning there is too much fuel entering the engine. The black smoke is unburnt fuel leaving the exhaust. There are a few different reasons this might happen, start off with a good service using the correct oil and be sure to replace the air filter as it may be partially blocked. if this does not fix it you may requir a replacement mass airflow sensor. another reason may be the injectors. This is all presuming you havent made any modifications to the engine or ECU.
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There is several possibilities that can cause smoke from the exhaust. Stopped up cylinder head return drains, valve stem seals, and a defective PCV system to name a few.
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