A vehicle is brought in for a complaint of a rotten egg (sulphur) smell coming from the exhaust. The most likely cause(s) is/are:
A) insufficient fuel discharge
B) rich air/fuel ratio
C) both A and B
D) neither A nor B

Question

Quizplus · Accepted Answer

A rotten egg or sulfur smell from the exhaust is typically caused by a rich air/fuel mixture, where there is too much fuel and not enough air being burned in the engine. This can lead to the overproduction of sulfur dioxide, which is converted into hydrogen sulfide (the rotten egg smell) by the catalytic converter. Insufficient fuel discharge would more likely lead to a lean condition, not a rich one.

A Vehicle Is Brought in for a Complaint of a Rotten