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Unread 10-05-2010, 11:56 AM   #196
keepishop
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1989 XJ Cherokee 
 
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Quote:
Originally Posted by PlatinumNiner View Post
No cat on a OBDI motor works. Yes you gain 1-2 horse if your lucky. No cat on a OBDII motor doesnt work. You will get CEL if you havent yet your just lucky. When they CEL is on you hurt your economy and power. Why are people obsessed with removing cats. It's pointless! You guys are stuck in the 70s when cats were actually restrictive. Get a good quality cat and you wont even know it's there.
(Assuming a cat from 89 is old enough to be restrictive by this point), would taking it out and banging it up a bit to shake all the crud out help the flow?

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Unread 10-05-2010, 04:26 PM   #197
xj-xile
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Funny, my CEL has been on for three years, now (O2 sensor problem). '96, OBD II. Runs fine. MPG always 14 or 15. No issues, though. I don't really care anymore.
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Unread 10-05-2010, 06:11 PM   #198
PlatinumNiner
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Check he fuse box under the hood. Little known fact, there is a o2 sensor fuse. Did you replace BOTH o2 sensors?
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Unread 10-05-2010, 06:27 PM   #199
XJ99
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Originally Posted by PlatinumNiner View Post
Check he fuse box under the hood. Little known fact, there is a o2 sensor fuse. Did you replace BOTH o2 sensors?


Yeah, make sure this one isn't blown.



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Unread 10-05-2010, 06:31 PM   #200
PlatinumNiner
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Yup. It's not listed in any shop manual or even the FSM. Most dealer mechanics dont even know its there. 99% of mechanics in general dont know its there lol. Seems like Jeep forgot to mention it to anyone.
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Unread 10-05-2010, 06:37 PM   #201
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Yup. It's not listed in any shop manual or even the FSM. Most dealer mechanics dont even know its there. 99% of mechanics in general dont know its there lol. Seems like Jeep forgot to mention it to anyone.

Yeah, I went round and round trying to figure
out the blasted CEL, and the o2 codes.
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Unread 10-07-2010, 12:57 AM   #202
Jameslol
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^ i dont believe it's illegal in all states.
Federal law, older cars don't need them because they didn't come with them.
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Unread 10-13-2010, 07:39 AM   #203
brigbeach
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I can not wait to add a few of these. Thanks
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Unread 12-04-2010, 06:01 PM   #204
olebluejeep
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Start it up! We need more
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Unread 12-09-2010, 10:17 PM   #205
hunterjl15
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we need more!!!
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Unread 12-30-2010, 06:13 PM   #206
jibbsnow420
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just bought my first jeep today.2000 xj so excited to add some mods
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Unread 01-04-2011, 12:13 PM   #207
Azzy
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Quote:
Originally Posted by keepishop View Post
(Assuming a cat from 89 is old enough to be restrictive by this point), would taking it out and banging it up a bit to shake all the crud out help the flow?
Im not a scientist, but I am a thinker. Banging it around could cause it to break apart may cause a rattle, with worse flow, at least as far as I could tell. I dont think thats your point of restriction in flow either.

Exhaust mods worth their salt are probably not going to be found in a "cheap fix" thread.
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Unread 01-04-2011, 07:00 PM   #208
PlatinumNiner
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A cat from 89 is part of your restriction with out a doubt. Technology has come a long way since 89 todays high flow cats flow just as well as not having a cat.
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Unread 01-05-2011, 12:11 PM   #209
keepishop
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Originally Posted by PlatinumNiner View Post
A cat from 89 is part of your restriction with out a doubt. Technology has come a long way since 89 todays high flow cats flow just as well as not having a cat.
I'll add a new cat to the growing list of things I need then.
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Current: Black 89 limited, dakota bastard pack, zj coils, 1.5" lift, open cooling swap, bronco 2 carrier, rad fan switch
Rest in Pieces: Red 1990 cherokee dana30/8.25 - v8 zj coils & s10 bastard pack 2.5" lift - 31x10.5r15 tires - v8 zj tierod

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Unread 01-05-2011, 04:07 PM   #210
jeepdavetj
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Remove Cat, gut Cat or run a length of exhaust pipe thought it. If your state don't sniff or look ( like SC ) your fine. Hell, I havn't had a Cat on my XJ for YEARS and gained about 2mpg and it throws no codes. It is a 91 tho.
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