What does sulfur smell like?
Hydrogen Sulfide is what smells like rotten eggs. Sulfur is best described as the smell a strike match gives off. Light and match and smell. That's sulfur.
The sulfur smell is the catalytic converter. There will always be some smell of sulfur. The converter changes the carbon monoxide in the exhaust to sulfur dioxide. Strong sulfur smell may be an indication the converter needs to be changed. This can also be a symptom of a leaking battery. We had a battery crack, and the sulfur smell was almost overpowering for a couple of days. Even after it was replaced, the smell lingered…
The "burnt match" smell is from sulfur. More than likely, if your feces smells like sulfur, then you probably ate sulfur-rich foods such as eggs. A methane smell would come from foods that attract a lot of bacteria in the intestines, often items that don't digest that well in the body. That might include eggs too, as well as beans, and a number of other things.