Hey, babywag, et.al., was hoping to have this data pulled/uploaded yesterday, but i ran into a snag - I ran the Jeep out of gas during the test... The gas gauge is off by about 1/4 tank - meaning, when it shows empty, i can only add 3/4 tank worth of gas, so i misjudged a little - ugh.
Anyway, after doing the gas can thing last evening, I decided to get out early before work this morning & follow your advice & remove/check/clean the O2 sensor, and its mating surface(ground). So far, i've only run it at idle in the driveway, but it appears to have had a positive effect.
Cleaning involved: using DeoxIT D100 electrical contact cleaner and 220-grit sandpaper on the threads/mating surfaces.
Before cleaning the O2 sensor was sooty & rusty.
And, so was the bung. Apologies, I don't have after pix.
Charting the O2 sensor data - before cleaning (CLOSED loop occurs at 190 on the X-axis). Average over the time period is 510, with a larger gap between lows & highs vs. AFTER, while the average of CLOSED loop values is 496.92; Min=0, Max=802.9.
vs. O2 sensor data - after cleaning (CLOSED loop occurs at 205 on the X-axis). Average over the time period is 437, with a smaller gap between lows & highs vs. BEFORE, while the average CLOSED loop values is 516.14; Min=65.1, Max=950.46.
Overall, based on the chart, things look better. Can't wait to make a test run tonite & see how it runs & what the logs look like. It seems like we're getting there.
Also, I didn't have time to look at the engine to frame ground strap. Have seen comments that it's located near the passenger side motor mount. Given the Frankenstein nature of this vehicle, my money's on there not being one.
This morning's data log is attached - Cold Start Idle to Hot - run time ~8.5 minutes.
More later...
Thanks.
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