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Why does exhaust have a “rotten egg” smell?

April 26, 2017exhaust rotten egg smell

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Why does exhaust have a “rotten egg” smell?

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Many times on the first startup in the morning, a vehicle’s exhaust may smell like “rotten eggs.” This is due to a rich fuel condition with a cold engine. However, as the engine warms up, this smell should go away. If it does not, converter damage could possibly follow with extended driving.