Bad exhaust smell

[griegjo1]

I have a 2004 Denali and have noted a bad exhaust smell. I previously had a 2002 Tahoe and did not have the same bad smell.

What causes this and can it be corrected?

[Vroom2]

What are the conditions under which you notice the smell? Could it be the under-body coating if the vehicle is still new? Can you describe the smell? A rotten egg or sulfur smell usually indicates a failed catalytic converter, for example. If that were the case, though, you'd most likely also notice a degradation in performance.

Take care,
Jerry

[griegjo1]

The smell is similar to a bad egg or sulfur smell. I notice the smell after initially starting the vehicle. The smell is quite noticeable when starting the vehicle in the garage.

[lodownlv]

the roten egg smell is a resault of the catalytic converter going bad the cause may be missing cillindar or a bad valve ect. have it checked