96 xj. 2 door 5 speed. New tpms sensor. No bank2 o2 sensor, no harness either. Lost it in the woods.

Secondary o2 sensors dont do anything, for that they only check cat effeciency

New sensor, code still there shortly after. Bad sensor? could this missing harness have to do with anything?

Symptoms:

TPS low voltage code, and o2 sensor code

up hill, HEAVY BUCKING. letting the clutch out from a stop, HEAVY BUCKING. light throttle. no bucking. FLOORED theres no bucking.

ABOUT TRUCK. new crank sensor, 200K. its been to hell and back probably more than any jeep on here. So there are a lot of variables.

 

bump

 

im not totally convinced that not having a downstream o2 is a good thing. i know ive been told that you can run it w/o one and you wont know its not there, and then mine went and i deff. noticed! it would buck and chug and almost stall out at a stop. it would make a pop, almost backfire from the manifold. my gas mileage sucked (11.0mpg)... this went on for a few months cause it wasnt throwing a code. when i got it fixed it ran great and all issues immediately were gone. so IMHO, it worth fixing. i did both and didnt skimp on the quality.

 

you have listed the exact same symptoms as i had. exact! i was convinced it was my IAC valve cause it would not do it when throttle was open to a certain point (the switch between low and high idle). and i even though there was a chance it might be the TPS. i replaced all this stuff, then the plugs, wires, cap and rotor, too.. but it all came down to that downstream o2...

 

what are the actual codes that it is throwing?

If you already replaced the TPS, i would look elsewhere.

The O2 sensors measure the efficiency of the cat converter and alter the engine computer (ECU) parameters to provide the most efficient operation. The ECU can be confused by non-functional O2 sensors or out of range data. That missing post cat o2 sensor data could certainly be messing with the computer and the engine operation. I would recommend replacing the harness and o2 sensor and see if the problem goes away before doing anything else.


A faulty Crankshaft Position Sensor has also been known to cause this issue, and since you said you ripped off the o2 sensor harness, which is right next to the CKPS harness, it sounds like it could be a good bet. Check the wiring harness running to it first. If it looks ok, try replacing the sensor.
http://greatlakesxj.activeboard.com/...picID=24211453

 

...yup...

 

It's running too rich. O2 Sensor isn't there and that's indicating your exhaust is pure oxygen. How does the Computer cure oxygen in the exhaust? It adds more gas until the mixture is right. In your case it's probably maxed out the mix and heavily affected drivability. Get the o2 sensors working, and it'll go away.