Tony D Posted November 16, 2013 Share Posted November 16, 2013 (edited) Exactly! I can't tell how many times I've tried to explain the cat does NOT act as a continual scrubber, but a transient cleaner. Tuned properly, with no misfires, it lasts a loooong time! A bad plug wire pumping unburned HC into the monolith causing it to overheat and melt/crack....welcome to the reason for CA-Specific Catalysts! Edited November 16, 2013 by Tony D Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted November 16, 2013 Share Posted November 16, 2013 At lexus, we get cars with check engine lights and a rattle from the back of the car on occasion. I opened the gas cap on one and it smelled like diesel so I popped off the cats to take a look and found a nice neat hole bored right through the center of the catalyst. The rattle was the chunks of catalyst bouncing around in the mufflers. I'm pretty sure it was only a couple of gallons of diesel which made the car hard to start and smoke a little. I've seen 1990 LS400s with pristine cats. Quote Link to comment Share on other sites More sharing options...
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