Rotten Egg Smell In Car Exhaust. A rotten egg smell emanating from catalytic converters is common. A sulfur or rotten egg smell is exactly that, the presence of hydrogen sulfide in the exhaust system.
Also, it runs really, really bad when i do not warm it up for at least 5 minutes. Could be coming from your exhaust system.
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Diesel exhaust has always had a significant smell compared to the smell of a gasoline engine’s exhaust, but in general it shouldn’t exhibit much of a sulfurous smell. Exhaust systems that smell like rotten eggs or sulfur are usually due to an exhaust leak.