New O2 sensors are on. My brother-in-law helped me with this. Actually, I called him to borrow a wrench. I seem to be lacking a 7/8", what the heck? He came over and crawled under the Jeep with me, and before I knew it, the grease monkey and I got them swapped. He's far more mechanically inclined than I, so I'm glad he offered to help. It always makes work easier when you have two people. Also, I despise plastic clips, clasps, connectors, brackets, etc. The old ones all snapped, but fortunately we got them off the Jeep and the new ones on. It was just the O2 sensor clips themselves that broke, not the actual connectors on the wiring harnesses on the Jeep. Still, what a PITA.
The 4.0 idles a bit smoother now, and as the computer relearns with the new sensors, I'll see how it goes. The average mpg for the 5-7 miles I put on her after the swap was 17.6 according to the overhead readout. It's not dead-on, but that's better than I usually get. A lot better. I imagined 4mpg improvement in-town isn't out of the question. We'll see on the highway. Right now I've been getting 10mpg in-town on 30.5's. That's just sad. So here's hoping.
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"Roads? Where we're going we don't need roads"