I went and acquired the new o2 sensor....and unfortunately it still has the rich/lean condition...I checked the o2 wiring all looked good with that.I dont know where else to look or where to start?

 

What does it mean when you say the new oxygen sensor still has the rich/lean condition?

It is generally going to be a rich condition? Or, a lean condition? It will not ussually present as being both, a rich and lean condition at the same time when things are abnormal on an oxygen sensor circuit.

How did you check the oxygen sensor wiring? How did all of that look good to you? Do you mean there was nothing found wrong being visually obvious when you looked at it with your eyes? Or, did you get a read of the electricity too?

There is ussually a reason behind why a fuse ends up being blown. Any of the electrical associated to the circuits of this blown fuse is now a suspect. I say circuits (plural) since oxygen sensors in general, as well as specifically their heater element circuit, these also have ties into many other systems with individual components located there to have a possible effect back and forward...

It would normally be seen as a problem with something located downstream to the fuse though.

There should definitely also not be any sort of magical aspect of a TPS.

 

Let me rephrase.Its showing a rich condition,then lean condition,with milliseconds..and yes I had just inspected the wiring visually...I did not read resistance on the connector...I'm guessing you would recommend checking resistance on the connector?

 

In a way, it sounds like it is acting normal to flip from rich to lean. They do respond to changes at the 100 millisecond rate. If it is happening 10 times per second? This would be the sensors maximum transition rate happening every 100 milliseconds.. and is abnormal. A good quality scan tool is needed in order to accurately pick up the transition rate.

For our Jeeps with throttle body injection it should be high voltage to low voltage transition which occurs at approximately 3 - 4 times per second when the engine is at 2500 RPMs.

A good 02 sensor should produce a oscillating waveform at idle making transitions from near minimum 0.1V to near maximum 0.9V approximately 2 times per second at idle (slightly more.. closer to 2 - 3 times per second but, not quite)

I would try to stimulate the oxygen sensor by simulating a lean running condition by pulling off a large vacuum line to allow more oxygen to run through the system. Creating a lean running condition by opening a vacuum line should cause the sensor voltage to drop to its minimum 0.1V value instantaneously (within 100 milliseconds) to see if it is normally responsive.

You can simulate a rich running condition by blowing propane into the intake and seeing if the sensor responds by going to its maximum of 0.9V in the same similar way as done above, to see if it is normally responsive in this direction. The transition should happen at the same 100 millisecond rate.

I would check the power and ground wire with a multimeter to make sure they test proper, the connector pins and terminals of both the harness and sensor sides of connections, and resistance/continuity if I were wanting to be certain all of this was normal as it should be too.

 

I have been looking at the live data readings on my brother in laws scan tool he got from the snap-on guy....so the o2 sensor does fluctuate between volts but it's not steady it seems to jump around alot....but it never reaches past .88 I'd say and never goes below .15...and I'm not currently around my jeep to test the connectors...hopefully I can sometime within the next day or two

 

0.88 and 0.15 are pretty darn good for maximum and minimum readings.

That Snap-On is a real good quality scanner. Do you know if it is the Ultra or Pro model? They are both great though. I have used the Pro a couple of times and it has endless possibilities.

 

You should mess around and see what happens with the oxygen sensor sequences during cold idle and hot idle, during periods of heavy acceleration, and sustained RPMs at 1500 and 2500. Do a few runs and compare the data.

There should be a good quality waveform with regular sequencing that changes under all of those conditions.

 

I'm not to sure which model it is,but yes it can do all sorts of things...its mind blowing actually...and I will hopefully be able to go over to the shop and do some testing either tomorrow or Wednesday..as I will be installing my new tires.. but thank you noah for the tips i really do appreciate it,and everyone else on this forum.you guys have helped me so much over the short amount of time I've been a member

 

It sounds like you have a friend of sorts over at the shop. This person would probably be the best help for you. I imagine someone will really know how to correctly use this tool. This person would probably only need maybe half an hour, and be able to tell you all sorts of information about how all of the different systems of your Jeep are doing. They could quickly narrow things down to let you know what all is totally normal, and which systems are showing as being unhealthy. In less than a half hour an expert could say exactly where the problems may be located if any of the different systems have issues.

The best tools in the world will not be able to turn a novice into a professional overnight. You have to be careful with this tool too.. because you can get yourself into something, change parameters, and really mess stuff up. There is much information they can reveal. However, this also makes it somewhat of a double edged sword if you do not know what it is you are doing.

 

Yes actually my brother in law owns an offroad shop here in anderson sc,but they are more into lifts,tires,fab work,superchargers,and engine swaps,they dont usually do diagnostics.And they stay fairly busy so I've been doing all the work myself(becuase I'm impatient).

 

Let me rephrase...I assume they could do diagnostics on my jeep,but like I said they stay so busy,I dont want to burden them with my project. And they mostly work on new jk's,JL's,JT's..and some TJ's,YJ's