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Unread 04-06-2010, 09:06 PM   #1
yjryne
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1998 TJ Wrangler 
 
Join Date: Aug 2009
Location: Gwinnett County, GA
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94 yj cat problems?, solution?

today, after noticing a rattle comming from my catalytic converter a few days earlier, i was offroading and when i got halfway home my jeep started to run as if it was being choked or something. i checked and all cylinders are firing, so im pretty sure its my cat.
i started my jeep and my dads and we both have the 4.0s and at idle his had wayyy more flow from the tailpipe than mine, and the exhaust is fairly new, so like i said, im thinking the catalytic converter.

anyways, im looking for the best solution here. jegs has 2 1/4 inch magnaflow high flow cats for 90 bucks, but those are all ive looked at. At the end of summer im moving to alabama and they dont check emissions, and im already good here in GA for another year, so would it just be best to take off the cat and just run a new pipe?

all opinions are appreciated, thanks!!

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Unread 04-06-2010, 09:18 PM   #2
yjryne
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i need help please!
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Unread 04-06-2010, 09:20 PM   #3
erockz
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buy a replacement factory cat.
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Unread 04-06-2010, 09:20 PM   #4
rustywrangler
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Get a high flow cat or a factory replacement. Regardless of state, it is against federal law to remove a cat converter from a rig that came with one from the factory.

And, as a warning to those that may support it, it is against forum rules to discuss the removal of or support removing the cat converter.

Honestly, get a new cat. Your motor will like you and you wont be adding all that crap to the environment.
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Unread 04-06-2010, 09:23 PM   #5
erockz
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Quote:
Originally Posted by rustywrangler View Post
Get a high flow cat or a factory replacement. Regardless of state, it is against federal law to remove a cat converter from a rig that came with one from the factory.

And, as a warning to those that may support it, it is against forum rules to discuss the removal of or support removing the cat converter.

Honestly, get a new cat. Your motor will like you and you wont be adding all that crap to the environment.
I agree with you. I'm a CT emissions inspector and certified repair technician. Its illegal for me to even suggest to somebody to remove their cat. lol
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Unread 04-06-2010, 09:25 PM   #6
idaholtby
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Quote:
Originally Posted by yjryne View Post
today, after noticing a rattle coming from my catalytic converter a few days earlier, i was offroading and when i got halfway home my jeep started to run as if it was being choked or something. i checked and all cylinders are firing, so im pretty sure its my cat.
i started my jeep and my dads and we both have the 4.0s and at idle his had Way more flow from the tailpipe than mine, and the exhaust is fairly new, so like i said, im thinking the catalytic converter.

anyways, im looking for the best solution here. jegs has 2 1/4 inch magnaflow high flow cats for 90 bucks, but those are all ive looked at. At the end of summer im moving to alabama and they don't check emissions, and I'm already good here in GA for another year, so would it just be best to take off the cat and just run a new pipe?

all opinions are appreciated, thanks!!
Your symptoms do suggest that the cat may be bad. Make sure the replacement is a three-way as your model year YJ does not have an EGR system and this is compensated for with the three-way cat. Any discussion about running with out a cat is frowned upon on this forum as it is against federal law. There is no performance gains to be had by running without a cat. Even if your local emissions laws do not check for it, by law, you need to run with one.
edit... damn I type slow, Rusty already chimed in on the legality.
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Unread 04-06-2010, 09:27 PM   #7
yjryne
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alright, so its looking like i ought to get a cat, but now id have to ask what type people recomend. factory replacement is probably pretty expensive, at least when compared to less than 100 bucks for magnaflow.

three way cat, whats that?

whats everyone recommend?
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Unread 04-06-2010, 09:31 PM   #8
bigjoe27
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If your cat is stock bring to a recycling place(cash for scrap metal should get you $30+ dollars) and then get one off ebay for under $100 dollars got one on all my vehicles for next to nothing after scrapping the old one and pass emmisions fine if not better.
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Unread 04-06-2010, 09:33 PM   #9
bigjoe27
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Magnaflows is actually what I run never had a problem on 4 differant vehicles not just jeep and if your running a free flowing exhaust get a universal cat to match the diameter and get more flow.
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Unread 04-06-2010, 09:34 PM   #10
erockz
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Quote:
Originally Posted by yjryne View Post
alright, so its looking like i ought to get a cat, but now id have to ask what type people recomend. factory replacement is probably pretty expensive, at least when compared to less than 100 bucks for magnaflow.

three way cat, whats that?

whats everyone recommend?
I say go full cat back performance exhaust since performance seems to be your goal.
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Unread 04-06-2010, 09:39 PM   #11
yjryne
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three way cat?

Quote:
Originally Posted by erockz View Post
I say go full cat back performance exhaust since performance seems to be your goal.
ive got a thrush welded muffler with new tailpipe and its two and a quarter inch pipe, so a cat of the same diameter should just match up. but i still dont know anything about this three way cat??
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Unread 04-07-2010, 06:11 AM   #12
Alfons
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With a 4.0 you will need a 3 way cat. The 2 way is meant for earlier configurations that were able to remove NOX in a different way, but the fuel injected engine will need the 3 way - insist on it, a lot of parts shops will give you a 2 way and you'll fail your next emissions test.

You don't need an OEM cat, you can use a generic 3 way as long as you have access to a welder to put the right flange on it, the rest of the connections can be made with clamps & couplings - this is the cheapest way to go if you can weld, otherwise get one that's bolt-in ready (you'll need the gasket for the connection to the exhaust pipe) and use clamps to connect it to the muffler.
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Unread 04-07-2010, 09:34 AM   #13
rustywrangler
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I think the OP has his answers.
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