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Old 01-05-2011, 04:16 AM   #1
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Removing the CAT

Guys, I have a question- what harm would it do to remove the CAT convertor on my YJ 93? It makes a rattling sound when the engine is cold. Now, some guys have said that it is "blocked", if this is the case, could one clean it or does one need to replace it?

I posted a thread earlier with the heading "Loss of Power". I have been through the whole episode of changing plugs, ignition wires, fuel filter & air filter, the only 3 items that remain to be touched are:

CAT Convertor
Air Mass meter
Cleaning of breather pipes, from the tappet cover to the airbox and a smaller pipe at the back end of the engine.

BTW- It is a 4.0L manual.

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Old 01-05-2011, 05:54 AM   #2
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Get rid of it. If I could I would, but the old '98 runs like **** without one.

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Old 01-05-2011, 06:23 AM   #3
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There is a FEDERAL emissions law that requires it.
It will not really benefit you power wise or in fuel economy to do without it.
It won't pass inspections without it
It helps keep the air just a bit cleaner, and that's a good thing.


Catalytic Converter Laws

Rules for Replacing Converters
In 1986, the U.S. Environmental Protection Agency issued new guidelines for the construction, efficiency and installation of aftermarket catalytic converters. All CleanAir converters listed in this catalog have been designed, tested and manufactured to meet this policy.

In addition, CleanAir converter listed in this catalog is appropriate for use under the current requirements of the California Air Resources Board (C.A.R.B.).
E.P.A. guidelines state that replacement converters may be installed only in the following situations:

1. The vehicle is missing a converter
2. A state or local inspection program has determined that the existing converter needs replacement
3. Vehicles manufactured prior to 1996 must have more than 50,000 miles, and a legitimate need for replacement must be established and documented
4. In cases of OBD Il-equipped vehicles (1996 and later), the O.E. manufacturer's 8-year/80,000-mile warranty must have expired and a legitimate need for replacement must be established and documented.
Please note that Federal law prohibits removal or replacement of a properly functioning O.E. converter.

When replacement of the converter is appropriate (as outlined above), the E.P.A. further requires that:

1. It be installed in the same location as the original
2. It be the same type as the original (i.e., two-way, three-way, three-way plus air/three-way plus oxidation)
3. It be the proper model for the vehicle application as determined and specified by the manufacturer
4. It be properly connected to any existing air injection components on the vehicle
5. It be installed with any other required converter for a particular application
6. It be accompanied by a warranty information card to be completed by the installer.
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Old 01-05-2011, 07:01 AM   #4
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when ever i have a cat problem, i do one of 2 things. if its at my familys property out in the sticks, then chances are it gets shot. if its in suburbia hell, then the trap comes out, and it gets dumped off at the pound.








oh, wait. your not talking about that kind of cat are you...
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Old 01-05-2011, 07:52 AM   #5
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just replace it. i just replaced my cat,muffler, and tailpipe recently because the previous owner decided to rig together his own exhaust. the cat was too small, the muffler was too small and the tailpipe was too short...exhaust leaks everywhere. but after i put all the right pieces on my jeep there was a huge difference. everything flowed a lot better and was more responsive. it was pretty easy swapping the jeeps exhuast compared to my other car i did some months ago. just a pain to deal with the rusty bolts!

autoanything.com has magnaflow cats for $100 free shipping.
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Old 01-05-2011, 08:34 AM   #6
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The 4.0 likes the additional backpressure that the cat creates. If you take it out of the equation you will have less power and your gas mileage will suffer.

PM me on a price for a Magnaflow. Quite a bit cheaper than what was previously mentioned.
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Old 01-06-2011, 12:38 AM   #7
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Thanks for the advise. Here in the Middle East the community really don't feel much for the environment, most of us drive HUGE cars, fuel is dirt cheap, less than a $ a Liter. Pity about the trash that gets left around. GCC Countries have the highest CO emissions in the world, not surprising the cars that gets driven here. The minerals and energy minister of UK would keel-over and die or have a hard-on for the taxes he could impose (With all due respect) on these guys.
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Old 01-06-2011, 02:59 AM   #8
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Well doggone it, THAT right there is a good reason to have your location on your profile!

Even though you aren't in a place where they have federal emission regulations it's always good to do what you can to help keep things clean. One less polluter, is one less and Mother Earth appreciates it.

I'm no tree hugger, and certainly no environmental activist but I would certainly try to encourage folks to at least do what they can.
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Old 01-06-2011, 06:17 AM   #9
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Well doggone it, THAT right there is a good reason to have your location on your profile!

Even though you aren't in a place where they have federal emission regulations it's always good to do what you can to help keep things clean. One less polluter, is one less and Mother Earth appreciates it.

I'm no tree hugger, and certainly no environmental activist but I would certainly try to encourage folks to at least do what they can.
Ahh man, I wish they would add UAE as a country in the region column, but know this, if I had to ever win the Green card Lottery- i would move to Texas / South Carolina (SC?) or Florida

I agree with you. Hence when we go camping we try and keep the place like we find it, vegetation is limited here so we try not to destroy what is around us. We use the few trees to hide from the heat, even in winter (which is now) it is still a mild 25C (Being climatised this is Cold). I just find that alot of people in this area really put little effort in and take little pride in their own country. Picking up rubbish after a fun day out would be a start to a better future.

Don't let the White DishDashes (Traditional clothing) fool you, there's alot of SH1T underneath that cloak. Not all the regions are the same, this place differs HUGELY from UAE to Oman- Oman is much more friendly and don't flaunt their cash as others.

Like I have mentioned before, I'll load some pick over the weekend and then you guys can check it out on my profile.

I am finding out prices for a new exhaust system (Including a CAT), I too want my kids to have a bit of the Earth I had.
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Old 01-06-2011, 06:49 AM   #10
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I'm no tree hugger, and certainly no environmental activist but I would certainly try to encourage folks to at least do what they can.
This one little earth is all we have!
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Old 01-06-2011, 08:48 AM   #11
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A clogged cat can cause a huge loss in power. I'd change it out.
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Old 01-06-2011, 12:39 PM   #12
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Ahh man, I wish they would add UAE as a country in the region column, but know this, if I had to ever win the Green card Lottery- i would move to Texas / South Carolina (SC?) or Florida

I agree with you. Hence when we go camping we try and keep the place like we find it, vegetation is limited here so we try not to destroy what is around us. We use the few trees to hide from the heat, even in winter (which is now) it is still a mild 25C (Being climatised this is Cold). I just find that alot of people in this area really put little effort in and take little pride in their own country. Picking up rubbish after a fun day out would be a start to a better future.

Don't let the White DishDashes (Traditional clothing) fool you, there's alot of SH1T underneath that cloak. Not all the regions are the same, this place differs HUGELY from UAE to Oman- Oman is much more friendly and don't flaunt their cash as others.

Like I have mentioned before, I'll load some pick over the weekend and then you guys can check it out on my profile.

I am finding out prices for a new exhaust system (Including a CAT), I too want my kids to have a bit of the Earth I had.
You're alright in my book!
It's funny, I have so little knowledge of other countries that I have few preconceived notions about folks based on their location. I am ALWAYS excited to "meet" people from different countries and to learn a little about where they live and what their lives are like.

It's been a lifelong dream of mine to be able to travel the world. It won't ever happen but at least we have the internet to explore on

I live in Tennessee USA and the countryside here is amazing in it's beauty. I moved here about 7 years ago from the west coast. It's heartbreaking to see the lack of respect that people out here have for their countryside. They litter more than any other place I've been to, and I HAVE seen a good chunk of the USA. It's a disgrace and just shameful.


For posting pictures, if you sign up for a photobucket account and set it so that it will resize your images to 800x600 automatically it works like a charm.

Nicetameetcha!
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Old 01-06-2011, 12:57 PM   #13
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We don't have any emissions testing out here in Alberta so it's not a legal issue here. To get an old YJ to be as emission compliant as the day it rolled out of the factory is almost impossible, especially if you consider all the blow by from the rings no wonder they're cats plug up, they can't burn off all the oil.
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Old 01-08-2011, 02:08 AM   #14
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You're alright in my book!
It's funny, I have so little knowledge of other countries that I have few preconceived notions about folks based on their location. I am ALWAYS excited to "meet" people from different countries and to learn a little about where they live and what their lives are like.

It's been a lifelong dream of mine to be able to travel the world. It won't ever happen but at least we have the internet to explore on

I live in Tennessee USA and the countryside here is amazing in it's beauty. I moved here about 7 years ago from the west coast. It's heartbreaking to see the lack of respect that people out here have for their countryside. They litter more than any other place I've been to, and I HAVE seen a good chunk of the USA. It's a disgrace and just shameful.


For posting pictures, if you sign up for a photobucket account and set it so that it will resize your images to 800x600 automatically it works like a charm.

Nicetameetcha!
Nicetemeetcha! I'll look into the photobucket account, but I must add I am in a very fortunate position to be married to a graphic designer, she usually helps me with this, all I really know is how to login to Facebook, chat with my friends and Fam.

Popular places are obviously the ones worse affected, that usually places you'd find the Hummers, Prado's and Lexus'es, places where our JEEP's go, it is generally nice an clean.
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Old 01-08-2011, 02:12 AM   #15
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We don't have any emissions testing out here in Alberta so it's not a legal issue here. To get an old YJ to be as emission compliant as the day it rolled out of the factory is almost impossible, especially if you consider all the blow by from the rings no wonder they're cats plug up, they can't burn off all the oil.
I guess I'll need to upgrade then to a TJ , problem I have with the TJ's is that they're a little "Light in the pants" for the type of escapades we get up to here in the Sandpit. What you need here is , instant power, low torque and definitely a manual Trans. - the YJ 4.0L delivers exactly that. Some dunes are MASSIVE and getting stuck is real easy
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Old 01-08-2011, 02:33 AM   #16
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I guess I'll need to upgrade then to a TJ , problem I have with the TJ's is that they're a little "Light in the pants" for the type of escapades we get up to here in the Sandpit. What you need here is , instant power, low torque and definitely a manual Trans. - the YJ 4.0L delivers exactly that. Some dunes are MASSIVE and getting stuck is real easy
Theres not much difference between a YJ 4L and a TJ 4L my friend.
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Old 01-08-2011, 02:45 AM   #17
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Straight pipe it
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Old 01-08-2011, 11:47 AM   #18
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Theres not much difference between a YJ 4L and a TJ 4L my friend.
I have not yet come across the 4.0 here in the UAE, but I'll keep asking and chatting to fellow Wrangaliers here. Big thing comes down to not making debt here- With all the advise and help I have found from you guys on this site, I am bound to come right- One way or the other. Thanks for the support- you guys are .

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