Why does my diesel exhaust smell bad?
Why does my diesel exhaust smell bad? There are a couple of things than can cause a sulfur smell to be emitted with your exhaust gases. The only other likely cause for the sulfur smell, barring fuel quality, is either too much fuel being wasted and burning off in the catalytic converter or a clogged catalytic converter that releases too much sulfur. Why does my Duramax smell like rotten eggs? Isolate and load test your batteries. Rotten egg smell probably means you are smelling sulfur. Battery acid is sulfuric acid, but I suspect that you are smelling a hot catalytic...