qtizzl3

ok i have a 96 I6 ZJ, its having a stuttering issue which i came to figure out its the upstream o2 sensor when looking under my zj the previous owner of the zj has the o2 sensor unpluged and setting on the holder for the transfer case.... i also noticed i dont have a catalyc converter for it to plug into cause i read thats where it plugs into??? i need help i am a jeep noob and need this problem fixed... also my heat is ran to a switch with a fuse does this have anything to do with it?? i really need help

94zjdriver

First thing I'd do would be replace the cat and install a new oxygen sensor.. needed for the computer to set the fuel correctly. these vehicles were designed to have the cat installed and the computer expectes it to be there.. messes up the calibrations if not there... I know some run without them, but most will at least drill a hole and weld on a bung and reinstall the oxygen sensor for the computer... Keep in mind most states require you to keep on road vehicles with all there OEM installed air quarity equipment. Besides they seem to run great with them as they are not as restricive as they used to be. I read some test run at drag strips and difference in times was mininual. I would start there then unhook the computer/ battery for a time and then reconnect and see where it get you in a week or so. sometimes takes the computer a few days to correct itself..

721

If it's a 96' then it should be OBDII, which means you'll have two O2 sensors, one on the down pipe and then one on the cat, you need both for it to run without throwing a code.

qtizzl3

I dont have a cat idk what the guy did when i bought it but it had a muffler leak and it ended up falling off i put a mustang gt muffler on it... what can i do so it stops throwing codes? And starts running normal?

721

Put the cat back on it and plug in the O2 sensors. You can get a slip on universal cat for a 100 bucks and NGK sensors for around $50.

qtizzl3

I do not have the cat... when i bought it it had a dynomax muffler and the o2 sensor was setting on the transfer case... the heater is ran to a seprate switch if you want i can take a picture of the whole "under carage"

721

BUY a cat and put it in, plug in the O2 sensors and it'll fix all your problems, I promise.

I don't see what your heater has to do with your exhaust system.

94zjdriver

Like he said you need a good base to start from... You need the cat and o2 sensors to work property.