Sorry for the late response. Weather has not been on my side. Seems like it has been raining here every weekend, the only time I have to work on it.
I checked for proper power and ground to the sensor and it was good. I checked the wire between it and the ecu and it was good.
I got the new sensor. While it the connector looked like the same weatherpack connector, it would not plug in. Turns out the little tabs around the terminals are slightly different. So no idea what the o2 sensor was from that I was running.
So I just simply depinned the old connector and used it on the new sensor. The pinout was the same.
Hooked it up and tested it.
It fired up and ran fine, but the AFR was still not adjusting. I hook up the computer and the value for the o2 sensor was still stuck at 451.
I pulled the memcal, read it, compared it and everything was right. I double checked the signal wire and it was still testing good.
In some frustration, I grabbed my spare ecu and plugged it up, and it now works! O2 sensor voltage was now swinging and the AFR was now adjusting.
I took it for a drive and it ran great, just like it always has. AFR was normal and it seemed like everything was back to normal.
So my guess was a bad pickup coil originally, then a mismatch of ignition coil and pickup coil when I tried swapping in the junkyard parts. Then the o2 sensor issue, who knows?
So I unbolt the old ecu from the dash and install the spare one. I park it for the day, thinking all was well again.
I go out the next day and me and the misses are going to go out for lunch. I decide to take the Jeep since it was finally fixed.
I get it in, it fires up just fine, but then sounds a little off. As soon as I start driving it, it is back to the original issue of missfiring like crazy, not on any 1 cylinder, and feeling like it is only hitting on half the cylinders.
I feel like I have just made a 5 month long complete circle right back to where I started. I just want to bang my head against the wall. I feel like I complete failure of a mechanic.
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