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Old August 15th, 2014, 02:52 PM   #1
knaffie
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Default Noon question, remove cat on 97 TJ 2.5?

My Mom has a 97 TJ and dealer is telling her it needs a new cat.....way too expensive for a 5000 mile/year play vehicle. Can I hollow it out and buy a fooler for the rear sensor?

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Old August 15th, 2014, 02:58 PM   #2
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I gutted the cat on my 97 tj 4.0L.
No 02 fooler was needed.
Had a header and cat back.

Gutted the cat on my roommates 95 4cly yj.
No 02 fooler needed.

If you do get a cel code. Put a spark plug non fouler over the 02 sensor.
Should fix it right up.

Magana flow has cheap universal cats too, if you choose that route.
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Old August 15th, 2014, 03:00 PM   #3
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I gutted the cat on my 97 tj with 4.0 when it clogged. My tj did not have a post CAT o2 sensor.

I never had a problem. Run a quality muffler behind it to avoid moisture (mine originally was straight piped after the cat and when it was wet out or I was on wet trails it would act up, once I installed a muffler the problem went away)
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Old August 15th, 2014, 03:19 PM   #4
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Quote:
Originally Posted by joe_jeep View Post
If you do get a cel code. Put a spark plug non fouler over the 02 sensor.
I have heard this, too. Anything that spaces the O2 sensor out and away from the flow. It supposedly slows the O2 switching down enough to fool the computer into thinking the cat is functioning.
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Old August 15th, 2014, 03:32 PM   #5
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I gutted the rattling cat on my 97 S10 with no ill effects.
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Old August 15th, 2014, 04:21 PM   #6
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I gutted the rattling cat on my 97 S10 with no ill effects.
You got lucky. That usually doesn't work on that vehicle.

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Old August 15th, 2014, 04:23 PM   #7
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Check around at other places for a cat instead of the dealer.
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Old August 15th, 2014, 04:37 PM   #8
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Quote:
Originally Posted by knaffie View Post
You got lucky. That usually doesn't work on that vehicle.

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Been 5 years with no problems. Even both O2's are in the stock location.
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Old August 15th, 2014, 04:55 PM   #9
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Yes, you can gut it. It might sound silly and smell a bit different, but it probably won't throw a code. And yes, don't go through the dealer if you decide to buy a converter anyway.
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