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Old 03-28-2006, 09:57 PM   #1
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Please help me be right

I cut out the cat on my 1997 TJ 4.0 and now i need to figure out how to jumper the 4 wire sho2 sensor (rear) to eliminate the check engine light and assure there will be no power,fuel/air ratio problems. the "right "part is i told my better half NO PROBLEM. Well, i have yet to find the correct solution to allow me to be right. Thanks in advance.

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Old 03-29-2006, 08:22 AM   #2
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I have installed flowmasters on several vehicles, but always left the catholic converter alone. Sorry I can't help you with that one.
My momma always told me to leave dem catholics alone........lol

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Old 04-04-2006, 09:51 PM   #3
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Why on earth did you take the cat out?
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Old 04-05-2006, 09:01 AM   #4
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Old 04-24-2006, 07:47 PM   #5
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02 sensor

I removed it cause it was broken inside and did not want to go get one as I am cheap and lazy and I think I'm smarter than I really am LOL.Thanks for the link I will buy one of those before I spend $ on a new cat.
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Old 04-25-2006, 05:24 PM   #6
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i heard that on older tj's the rear sensor only monitors a/f but wont actually change anything just make the ce light come on
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Old 04-25-2006, 09:38 PM   #7
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I noticed no power difference at all when I took mine out...hopefully the same happens to you...
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Awesome guy from carwash-"Well thats the Git-R-Done Jeep right there, Heres 50 cents, you need them way more than I do!!"
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Old 04-26-2006, 09:00 AM   #8
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I hope you guys never have to be smog tested.
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Old 04-26-2006, 01:07 PM   #9
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no smog test where im at
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Old 04-26-2006, 03:37 PM   #10
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Quote:
Originally Posted by whitebuffalo
no smog test where im at
But that don't mean you aint pollutin' the air.
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Old 04-26-2006, 05:28 PM   #11
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I've been in this arguement so many times...haha. I dont have to be tested at all were I live. And as for the air, I wish I could afford a new cat. But I have axles to put in!!! If you want to buy me a cat, I'll PM you my address!!
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Old 04-27-2006, 09:10 AM   #12
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Thumbs down

Quote:
Originally Posted by 97TjZack
I've been in this arguement so many times...haha. I dont have to be tested at all were I live. And as for the air, I wish I could afford a new cat. But I have axles to put in!!! If you want to buy me a cat, I'll PM you my address!!
Your attitiude is what helps to gives wheelers a bad rap.
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Old 04-27-2006, 10:02 AM   #13
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I think he is only joking. Don't get mad...
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Old 04-27-2006, 05:03 PM   #14
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Quote:
Originally Posted by paracutin
Your attitiude is what helps to gives wheelers a bad rap.
Drunk ass people tearing across country messing up beautiful terrain on ATV's, Jeeps, Trucks, Motorcycles etc.... are what give us a bad rap. People caring too much about lift kits and not about keeping our trails open give us a bad rap.

I don't believe that he was being serious. lighten up.
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Old 04-28-2006, 09:00 AM   #15
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I am definately not a greenie tree hugger. If I were I wouldn't be driving a 14mpg Jeep. I'd have some hybrid econo box POS. Hell, my last vehicle was a 2004 F250 4x4 crew cab with the V-10. I got about 7mpg with that one.
However, I am of the opinion that the pollution control devices installed by the mfg and required by the feds should be in good working order. End of arguement.
I don't care what he does or doesn't do and as long as he doesn't have to get tested or sell it to someone that does no one will ever be the wiser.
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Old 05-07-2006, 12:03 PM   #16
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I've noticed no difference in power or m.p.g. but i DONT like the ce light being on. When I have it apart to install my lift I'll do a high flow cat, but Ive got to let a little time go by so i dont feel like Im redoin something I never should have done to begin with.
As far as sellin it NO WAY JOSE I AM HOOKED JEEPS KICK BUTT (i do realize if I do sell it Ill have to fix it or risk being thrown into federal prison for life for violating federal emmissions laws)
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Old 05-08-2006, 12:45 PM   #17
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no ce light on mine

emissions laws are a scam. construction equipment (which is smog exempt) pollutes MUCH more than my 4 banger yj, but lobbyists line politiicans pockets so they dont have to worry about it. im not losing any sleep over it. im no enviromental rapist or greenie but damn, theres bigger fish to fry than a few cats going missing......
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Old 05-08-2006, 10:51 PM   #18
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Put it back in there. There WILL be problems. The O2 Sensor is used by the computer to constantly monitor the mixture to produce a "stoich" (14.7) Mixture of fuel and air. By removing/disabling the sensor it will make the computer think it's running LEAN and lengthen the pulsewith AND turndown time on the injector (Amount in Miliseconds that the injector is open) to try and richen the mixture. Also remember when the MIL light is on, the engine is in a different operating parameter. Sure an eliminator will "fool" the computer and MAY turn off the light, But it still will not be able to "monitor" and adjust the air/fuel mixture correctly for altitude/temp/load changes.(remember carbs??) It will always be full rich...and remember....gas isnt getting any cheaper these days!!!!!!


Quote:
Originally Posted by newjeeper
I cut out the cat on my 1997 TJ 4.0 and now i need to figure out how to jumper the 4 wire sho2 sensor (rear) to eliminate the check engine light and assure there will be no power,fuel/air ratio problems. the "right "part is i told my better half NO PROBLEM. Well, i have yet to find the correct solution to allow me to be right. Thanks in advance.
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Old 05-09-2006, 09:51 PM   #19
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does anybody know if I can just weld a nut on the straight pipe and install the original sensor?
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Old 05-09-2006, 11:08 PM   #20
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i dont think a nut will work becasue the o2 sensor has npt threads....
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Old 05-10-2006, 11:33 PM   #21
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As much as I shouldn't tell you this, Yes, you can. You will need to get the correct weld in bung from either an exhaust shop, or what I use is what is called a "spark plug Non-fouler" when I have to place an sensor in stream. A regular "nut " will not work. I think you will notice a rather large decrease in low end power with the cat gone. Just remember, every parameter of the engine operating system is designed for that cat to be there. Good luck, and I waish you would change your mind.......But thats why we live in USA!!!!

Quote:
Originally Posted by newjeeper
does anybody know if I can just weld a nut on the straight pipe and install the original sensor?

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