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Old 08-30-2012, 09:30 PM   #1
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Can I remove Cat Convertor

Hi I have a 1997 Jeep Wrangler with a rattly cat convertor. I have been quoted NZ$1,000 (US$798) for a second hand one or NZ$2500 (US$2000) for a new one and have been told I just can't remove it because of the O2 sensor.
Is this correct??


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Old 08-30-2012, 10:19 PM   #2
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My experience comes from a 1990 Ford with a 5.0L engine, but the O2 sensor is upstream of the converter and there is no communication between the two. The O2 sensor gives feedback to the computer to adjust fuel addition based on how much O2 is left after combustion. The cat converter is a passive device that's oxidizing the more toxic byproducts into something less harmful. I took the cats off my Mustang with no ill effects to engine performance.

Maybe things have changed since 1990, but I would say you're Ok doing it. There can be a hefty fine, however, if you get caught in an least in some states.

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Old 08-30-2012, 10:23 PM   #3
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It's a federal offense to remove the CAT. Not just that, but you -need- it on there for pollution control, we all breath the same air...
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Old 08-30-2012, 10:56 PM   #4
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Originally Posted by Hookie007 View Post
Hi I have a 1997 Jeep Wrangler with a rattly cat convertor. I have been quoted NZ$1,000 (US$798) for a second hand one or NZ$2500 (US$2000) for a new one and have been told I just can't remove it because of the O2 sensor.
Is this correct??

Welcome to the Forum.

I just noticed that you are from New Zealand. It may not be illegal there, but your Jeep should have at least 2 sensors, 1 upstream and 1 downstream of the converter and yes the sensors do monitor exhaust.

Go to one of the online parts houses and buy it. Take it to a local muffler shop to be installed. I bought one for my BMW a couple of years ago for 279.00 on line and the shop charged me 75.00 for the install. Local garages were quoting anywhere from 1000 to 1500.
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Old 08-31-2012, 05:17 AM   #5
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Also, the 4.0 motor likes a little back pressure. To put it in simpler terms, they have different mannerisms than what a typical V-8 engine will have. Your motor will actually run better with a catalytic converter. Magnaflow (if available to you) makes a very good CAT that is more durable than a stock CAT & is just as safe for the environment. I installed one on my Jeep & haven't had an issue.
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Old 08-31-2012, 11:25 AM   #6
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I just bought an OEM cat. For 50 bucks shipped and put it on in my garage can't beat that price.
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Old 08-31-2012, 05:19 PM   #7
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Both your O2s work to adjust the a/f ratio. You can drive it without a CAT but your performace and MPG will suffer slightly. The system will set the a/f mixture to a default setting and keep it there regardless of RPM or load.........IIRC
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Old 09-03-2012, 07:29 PM   #8
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Thanks Guys - I have tried a couple of US parts retailers to see if they will ship to New Zealand as we can't buy aftermarkets ones here and the Genuine Jeep one if US$2000



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