Intermittent Emission of Black Smoke.
Posted: Fri Oct 10, 2025 12:53 pm
Greetings
This may be quite verbose, but it will provide a clearer understanding of the issue.
Acquired a pre-owned W204 - 2012 C200 CDI last year, with about 107,000 miles and a satisfactory service history. One of the tasks performed by the prior owner was a forced DPF regeneration.
Upon acquisition, a comprehensive engine and gearbox service was conducted as a precautionary measure.
The vehicle operates well and accelerates seamlessly. However, whether I am on a freeway or a roundabout and accelerate significantly. A substantial plume of black smoke is present. I accelerated many times, emitting further puffs of black smoke, until it cleared up for a few days.
I have observed that the exhaust gas exhibits a hint of unburnt fuel or oil odours.
The automobile has lately passed the MOT with exceptional results, which is quite perplexing.
Additionally, on frigid days, white smoke is emitted until the engine reaches optimal temperature. Subsequently, the white smoke dissipates.
The engine is not consuming any oil, since I have been observing the dipstick and replaced the oil and filter myself last week.
I am considering replacing the MAF sensor; but, before incurring expenses, I felt it prudent to get an opinion.
This may be quite verbose, but it will provide a clearer understanding of the issue.
Acquired a pre-owned W204 - 2012 C200 CDI last year, with about 107,000 miles and a satisfactory service history. One of the tasks performed by the prior owner was a forced DPF regeneration.
Upon acquisition, a comprehensive engine and gearbox service was conducted as a precautionary measure.
The vehicle operates well and accelerates seamlessly. However, whether I am on a freeway or a roundabout and accelerate significantly. A substantial plume of black smoke is present. I accelerated many times, emitting further puffs of black smoke, until it cleared up for a few days.
I have observed that the exhaust gas exhibits a hint of unburnt fuel or oil odours.
The automobile has lately passed the MOT with exceptional results, which is quite perplexing.
Additionally, on frigid days, white smoke is emitted until the engine reaches optimal temperature. Subsequently, the white smoke dissipates.
The engine is not consuming any oil, since I have been observing the dipstick and replaced the oil and filter myself last week.
I am considering replacing the MAF sensor; but, before incurring expenses, I felt it prudent to get an opinion.