Ok guys, so last night I was under the xj and was by my down pipe... I see a wireing harness disconnected....after further research I found out it goes to my o2...i look at my bung in the down pipe. And guess what's not there...my o2
so I've been driving my xj for 2 years with out an o2..which would explane why my xjs geeting poop for mileage right?.
Any who what's the best o2 and cat I can put in....side note my cat rattles like it has ball bearings inside the thing. Also the xj is a 93.

 

Is your check engine light is burned out? Or has it been on for 2 years?? Really should have a functional OBDI system; it is very helpful in keeping an efficiently running XJ; I'd make it a goal of yours.

1. I would specifically look for NTK oxygen sensors. NTK is the OEM supplier for the XJ from 91-01. Bosch has a little different spec on their heating circuit and some (not all) have had trouble with them.

2. Verify that the rattle isn't the cage around the outside of the cat. If it isn't, then bite the bullet and replace the cat. The insides break loose and rattle when they fail.

 

nope the cel is not burnt out Because it comes on when the key is turned. But i have not seen any cel from the missing o2. The last cel i had was 2 years ago when i first bought her. And never got the code checked. BC AutoZone and everyone else couldn't check obdI.
And i plan on getting an o2 on Monday.
And as for the cat. It is not my heat shild its the cat its self.

 

was the exhaust not loud with a missing o2

 

My Renix ran ok with the o2 snapped in half. Its not good, though.

Check the forum vendor section for a high flow cat.

 

On my motorcycles, you could eliminate O2 sensors by installing O2 elimiators. You unplug wiring harness from the O2 sensor, and leave the O2 sensor screwed into the bung. You would then connect the O2 eliminator into the now disconnected wiring harness. The reisitance "tricks" the ECM into thinking that the O2 sensor is installed and working properly. You could make O2 eliminators with a radioshack resistor which matches the reisitance of the existing O2 sensor. [The Honda VFR 800 uses 330 ohm 1/4w resistors], but you need to check first (please). You would jump th leads of the wiring harness with the resistor.

You would use O2 eliminatos when installing "Power Commanders", a magic black box that takes over fuel injection maps to get better performance (not milage).

Give that a try - it is cheaper and easier, and might give you better performane for about $1.00.


scroll down to see what I am referring to, they call them O2 Optimizer Controllers, but they are simply resistors:
http://www.powercommander.com/powerc...ent_parts.aspx

 

i am one of those who had no luck with any aftermarket o2's. i went to the stealer for mine. which i recomend. go to performancecurve.com he is a vendor on here, mudfrog is his name. cost u like 30 bucks for a cat. i cant believe you ran this for 2 years and didn't know. you must of heard a hellish leak.

so basically what u are saying is that ur rig has been running in rich mode for 2 years??? boy i would hate to see the carbon buid up in the head of that motor.

 

i know what o2 sims are. they are popular in the mustang,corvette,camaro...etc. its so you can run with out a cat. pretty pointless in this application since he drives a jeep and not a sports car. besides they arnt that cheap anyway. about as much as an o2 sensor is.


not to mention that its illegal as hell to run w/o a cat regardless if ur state has emissions test. this is federal and fines are steep.

hence this is a perfect reason that all states should have emissions; because if he had state inspection he would have known there was a problem and fixxed it. he possibly nocked some life of that motor. its a shame.

 

Here is how you can check the codes yourself on any OBDI XJ (91-95)
------------------------------------------------------
Retrieving OBD codes on the Jeep Cherokee (XJ)

OBDI models (1991-1995) - Start with the ignition off. Within five seconds, switch the key on, off, on, off, on. ("On" is NOT "Start" and "Off" is NOT "Lock"). The "check engine" light will flash. Count the flashes. Each code is a two digit code, so a (for example) 23 would be FLASH FLASH (pause) FLASH FLASH FLASH (long pause). It will never flash more than 9 times, so watch for those pauses!

OBDII models (1996 and “SOME” 1997 models) Put the key into the ignition, push down the odometer reset button, then turn the key to RUN with your finger on the button - and then release the button. The odometer will go through 1111111 through 999999, then display the car's serial number. It will then show the 2 digit error codes. The2 digit code is helpful, but it is not as specific as the full PXXXX code, which is only available using a code reader or scan tool, so generally I recommend using the code reader or scan tool. But if you have a CEL and don’t have access to a code reader or a scan tool, try the odometer technique to point you in the right direction until you can gain access to a code reader.

Note: The above OBDII odometer technique works only for 1996 and early 1997 model XJs, so while it might work on one 1997 XJ, it might NOT work on another! Once Chrysler made the change during the 1997 build year, for anything built after that date through 2001 you will need either a code reader or a scan tool to retrieve the codes.

 

I agree, you should run with a Cat, no need to polute more than necessary. The O2 Eliminators for the Motorcyles are for the Power Commanders, not to eliminate Cats. I corrected the resistance to 330-Ohms, there in no intellegence in them as it sounds like there is for the type you are referring to, my thought was that it might be a cheap fix for the OP. Oh well...

 

I have had an o2 problem before too the car would die every time it stopped and wouldn't go any faster than 35 mph. However there is good news I replaces it though it wasn't the most affordable fix it made the car run again now it will go like 120 mph.

 

Well I plan on sea foaming and using deep creep... As far as loud exhaust. It already is since I put on a flowmaster. Also bought an ntk o2 this morning. As well as the sea foam. Now to order the cat.

 

I'm still wondering why you didn't have a check engine light with NO upstream oxygen sensor.........Doesn't make any sense.

 

Well if the plug was just hanging there, maybe there was 330 ohms worth of crap built up?

 

Lol all I know is I have to clean the **** out of the hook up for the o2...full of mud/ oil.