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Discussion Starter #1
Any of you out there having problems with your cats in the 3.5L engine? I'm on my 4th cat. I passed the emissions test quite easily so I doubt I have a rich fuel mixture.
 

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Now doesb that mean you had to replace 1? 3 factory plus one aftermarket. Did you replace due to emissions problems or were they leaking?
 

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Discussion Starter #4
Sorry for taking so long to post again, no internet for awhile,

anyways, I had 2 factory (orignal and second) then I switched to 2 aftermarket. It's only the main 3-way cat that keeps breaking down, the pre-cat's are fine. No leak or anything, it's just that I get massive rattling at idle from the cat, like the honey-comb structure inside has failed, but it passes the emissions test.

I don't understand it. The noise happens a few months after each swap of the cat
 
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