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Old 08-28-2011, 08:33 PM   #1
zeissheadreggie
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Default What causes a catalytic converter to go bad?

Hey everybody! I'm assuming that position(bent over and ankle grabbing) $1679.00 to replace the cat converter.(bank1, left). Did this at Midas Muffler for $804.00 a few years ago, so you can guess that I'm not a happy camper! I've switched from 87 octane to 93 octane, kept this vehicle tuned up, and the vehicle fails the annual emission test here in the People's Republic of Fulton Co. Ga. Several people I know are also having this expensive and unpleasant experience. Is it this ethanol crap or a history of cheap premium fuel? Angry and broke!!!

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Old 08-28-2011, 08:54 PM   #2
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Default Re: What causes a catalytic converter to go bad?

If your vehicle requires regular, the changing to a higher octane will do nothing, other than lighten your wallet. I've only had 1 go bad and that was caused by the inner wall of the head pipe collapsing due to corrosion and plugging it up. It was covered by the 8 yr. 80,000 warranty on emission equipt. From what I've found the ethanol does not cause a problem with them. Some parts store fuel additives are bad for converters as is excessive heat and excess fuel going out the exhaust. So if your vehicle is running rich (bad injectors, bad O2 sensor, etc.) that would be damaging to the converter. Maybe your emission station has a deal with the repair shop to say your converter is bad and doesn't pass so they make money replacing good parts??? The only other thing would be physical damage from hitting something, that could cause the catylist material to break up and plug it. If you haven't tried, do a Google search and see what comes up. Good luck

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Old 08-28-2011, 09:18 PM   #3
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Default Re: What causes a catalytic converter to go bad?

I'm sure the ethanol isn't good for them (it's pretty much bad for every part on the car it touches).

That seems like a lot to change the cat converters, and very strange to have them fail. Especially seeing as there's 4 of them. 2 in the exhaust manifold, and 2 in the J pipes.

I'd wager to say there's something fishy going on.

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Old 08-28-2011, 09:53 PM   #4
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Originally Posted by zeissheadreggie View Post
Hey everybody! I'm assuming that position(bent over and ankle grabbing) $1679.00 to replace the cat converter.(bank1, left). Did this at Midas Muffler for $804.00 a few years ago, so you can guess that I'm not a happy camper! I've switched from 87 octane to 93 octane, kept this vehicle tuned up, and the vehicle fails the annual emission test here in the People's Republic of Fulton Co. Ga. Several people I know are also having this expensive and unpleasant experience. Is it this ethanol crap or a history of cheap premium fuel? Angry and broke!!!
As for the price, I'm told the front everything from the front of the system has to be replaced. Midas muffler appears to either improperly install this thing wrong, or not replace the O2 sensor, but it's all got to be replaced! If I feel like I'm getting screwed, it's a very good chance that I am getting screwed....

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