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Old 02-05-2012, 03:23 AM   #1
NorCalMax
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Default When to replace your cat?

So when should someone replace their cat that drives pretty hard and fast? im running a tacoma 2.7l with 177000miles.
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Old 02-05-2012, 07:24 AM   #2
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No idea from me.... I would replace it if you fail the smog test (if it is the cause of the failure)... meaning that the cat is clogged (the screens inside).
But to see that you would have to remove it and visually look or disconnect the o2 sensors and have it smog tested.
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Old 02-05-2012, 10:37 AM   #3
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Unless you are throwing code P0420 you don't need to replace your cat.
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Old 02-05-2012, 01:38 PM   #4
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Unless you are throwing code P0420 you don't need to replace your cat.
x2

Since the truck has sensors front and rear of the cat, it will tell you when it's not working right with a CEL.
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Old 02-06-2012, 11:36 PM   #5
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When it stops catching mice.............
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Old 02-06-2012, 11:51 PM   #6
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When it stops catching mice.............
Hahaha for some reason I knew someone would say something along those lines. Awhile ago a code was thrown from my cat back but my cel went off
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Old 02-07-2012, 12:13 AM   #7
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I was gonna say, 'when it dies'...and then...get a dog.
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Old 02-07-2012, 12:15 AM   #8
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Awhile ago a code was thrown from my cat back but my cel went off
Mouse prolly backed out of the pipe once he saw the maze got harder.
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Old 02-07-2012, 12:37 AM   #9
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Haha wtf.
I think I'll pull the cat and have a look. If its bad I may punch it out and save for a high flow cat
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Old 02-07-2012, 09:37 AM   #10
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You lose money by punching it out. Cuttting it near the body and welding in a straight pipe lets you sell the stock cat to the recyclers like the tweakers do. Except you're selling your own cat instead of a stolen one.
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Old 06-12-2012, 09:25 PM   #11
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You can fail a Cali smog test with no CEL. Mine was 12 years old when that happened, and a new cat brought the smog numbers back to same as a new truck.
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Old 06-13-2012, 06:16 PM   #12
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When it stops catching mice.............
Wasn't there someone on here a while back that really did suck a mouse through his engine and have it kill the cat?
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Old 06-16-2012, 05:15 PM   #13
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Ya man, leave it alone, or yank it off and throw it in the garage and have a test pipe built up just so you can get this outta your system. You'll regret not having it if you gut it. They beez espensive yo. Especially with the smog Nazis out in Cali.
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