? CAT - how to test the Cat

JayQQ97 said:
could be that the old Cat under the truck is making this weird vibe I've been experiencing for most of this year
conditions when it rattles are after an hour or more wheelin' on the freeway and ambient outside temps are in the 80s 90s
3rd 4th gear nearing 3k RPM shift is usually when the rattle occurs
current mileage on truck is 337k, first noticed a queer rattle at 295k

can an exhaust shop determine if this cat is roached and i need to look into replacing catalytic converter

there has not been any trigger of the CEL yet
so IDK :confused:
Click to expand...

issue was found that was making that odd noise
and it was NOT the cat :confused:
 
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