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Old 02-07-2009, 06:36 AM   #1
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keeps burning out catalytic converter?

I have 93 2.5 when I bought it the exhaust was rattly took it to exhaust specialist. They said cat and muffler needed replaced. Had them do that about a year ago. Now its starting to sound the same again. What should I look into to fix this and keep it from happening again. Gonna have to replace cat and muff again but would like to fix whatever caused it so Im not doing this all the time. Its not real cheap. Any info would be appreciated Thanks. I have already done a tune up wires plugs etc.

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Old 02-07-2009, 01:34 PM   #2
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try getting a catalitic converter test pipe.........or have one made. see how it runs then. if it runs the same it's not the catalitic converter. if it runs good, store the converter in a safe place.

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Old 02-07-2009, 05:14 PM   #3
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all catalytic converters sold have to have a long warranty by law. i can't remember what it is but it might be 5 or 8 yrs. its 8 from the factory, but anyone that sold you a cat has to warranty it for a good while, i know its well over a year like the rest of the junk.
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Old 02-07-2009, 08:11 PM   #4
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sounds like you have a burnt valve.
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Old 02-08-2009, 04:32 AM   #5
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Thanks guys. My motor runs fine uses no oil. Don't miss or lope not the most powerful though pulls itself around just fine though. The exhaust place said that peices of my cat were blown into my muffler. Like it burned it out and broke it down and blew back into the muffler which is what rattles. Any ideas? Wouldn't a burnt valve make it have a miss?
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Old 02-08-2009, 07:20 AM   #6
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you don't have a burnt valve. it was a cheap cat, most exhaust shops use very cheap cats, out here they even have problems passing emissions and i have to redo cheap exhaust shops work a lot. like i said, a cat has to have at least a 5 yr warranty by federal law, at least thats what i'm told. they should replace it under warranty.
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Old 02-09-2009, 04:06 PM   #7
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Thanks JPDOCDAVE. Thanks for all response. It burned up one that was on it now another if this continues. What would cause it? Running to rich? Running to lean? Bad o2 sensor? Im not familiar with fuel injected electronic controlled. Always had old school V8 and Carbs.
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Old 02-09-2009, 06:09 PM   #8
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From the sounds of it isn't there a possibility that the converter is of a less than premium quality. There is a reason why the aftermarket converters are much cheaper than oem replacements. Man I love living in Michigan where we dont have the exhaust police.
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Old 07-30-2009, 09:15 PM   #9
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I've had several problems with my cc too. There are some recalls on Jeep cats, so check into that if you haven't had your problem fixed already. A few years after my stock cc failed, I had it replaced by someone other than the dealer. When that cc failed too, my dealership still honored the recall and replaced it even though they had to fix faulty work done by a different auto shop. So look into that. My Jeep is a '97, though, so I'm not sure if your year had a similar recall.

As for the exhaust, I've had problems with that too. My muffler rattled like nobody's business, and I thought it was literally falling off. Turned out that a bolt had come loose and dropped into my exhaust causing the rattle. That was a major undertaking I wasn't comfortable tackling myself, so my mechanic fixed it (the good thing was that I wasn't charged for any parts--just labor).
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Old 07-30-2009, 09:37 PM   #10
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Quote:
Originally Posted by jpdocdave View Post
you don't have a burnt valve. it was a cheap cat, most exhaust shops use very cheap cats, out here they even have problems passing emissions and i have to redo cheap exhaust shops work a lot. like i said, a cat has to have at least a 5 yr warranty by federal law, at least thats what i'm told. they should replace it under warranty.


One year 25k mile warranty on aftermarket converters, But if you are burning out one after the other you have a problem upstream, It takes 2500 dg to fracture the ceramic substrate if your motor is running properly you should never see more than 7-800 dg at the converter. You have to be dumping excess fule and it makes as far as the converter where it burns off and raises the temp to the point of meltdown or fracture. A converter is a very simple piece of equipment, but when things are not right upstream you will never be able to keep a converter intacted.
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Old 07-30-2009, 10:31 PM   #11
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what all should i check that might be causing the to much fuel problem
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Old 07-30-2009, 10:54 PM   #12
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i think you got a junk replacement part however if your car is running so rich that its dumping fuel into the cat drive it around at night and get it up to temp come to a stop and look at it the cat will be glowing
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Old 07-31-2009, 05:28 AM   #13
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im leaning with others saying its a junk cat. also those mieneke mufflers or who ever have the worst mufflers. they always rattle apart internally.

Test pipes in most states are illegal and must be present for inspection(that said i have one and my jeep runs great).

get a quality muffler like a magnaflow, dynomax and a premium quality cat online. take the old stuff out and throw them through the muffler shop's window that sold them to you. then install the good stuff yourself. you can make your own testpipe by just removing cat and install the same length straight pipe in its place.
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Old 08-01-2009, 07:24 AM   #14
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My test pipe is installed!




I will be finished with my testing, in about ten more years.
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Old 08-02-2009, 06:44 AM   #15
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I agree with KT - I'm glad I don't live in an emission inspection state. The CAT problem has been there for awhile. Do like the guys say and get a good aftermarket CAT - Random tech makes and good highflow one.
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Old 08-04-2009, 04:10 AM   #16
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Thanks guys I will have to do that night time glowing cat check. If thats the case what should I look for to fix that? Definitely when I replace the cat this time it will be a good quality one. So I want to make sure its not a excessive fuel issue first

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