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97 STS (retired), 05 STS4 (retired), 2013 CTS V coupe
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218 Posts
You can also try changing the brand of gas you use. Some brands have slightly different mixtures and levels of sulphur in the gas, and it can make a difference. For example, it seems when I use Sunoco, my car smells like crap all the time. If I switch to Mobil, or Citgo, I'll get almost no smell at all. I've been getting the smell more then I like lately though, no matter what gas I use. So kind of curious what could be wrong, could a bad EGR valve cause this as well?
 

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White Diamond '03 DHS (with DTS floor shift)
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86,594 Posts
Usually if you bang on it with a rubber mallet and it rattles, it is shot. Often it will plug the exhaust and the car won't run or you may get a catalyst inifficient code.
 
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