Gunpowder smell
#1
Gunpowder smell
02 maxima has a gunpowder smell after driving hard, or on the highway. I think it is most likely cats, but how would I tell if it is pre cats, or the main cat? Thanks
#2
If by gunpowder you mean sulfur/rotten egg then it is definitely the cats. Virtually impossible to tell which as far as I know without it throwing a code or opening it up to look. Either way you might as well punch out the main cat and reinstall or just replace it with a "racing catalytic converter" and then do the ol' nonfoulers or o2 simulator.
#6
I think I may be experiencing this myself. Just recently. Seems to come from the passenger side. Caught it after backing into the garage. How is the motor running otherwise?
#7
The car is running great itself, just waiting for it to throw a code, most likely getting a stainless cat from warpspeed and some headers.
#9
#10
Here's the thing in my case. I've been debating for about 2 weeks now whether I have a rod knock or a pre-cat going bad (sound). Been babying the car not knowing what the hell it is. Then this smell kind of like what you refer to.
Distinctly different though.
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