I have been spending all my time working on "short" Jeeps, decided to knock out some "deferred maintenance" issues on "old reliable".
I have had the same O2 sensor installed for almost 60k miles. It was the original "Mopar" sensor that I first installed behind the 4.2, and it stayed in place when I installed the 4.0 engine. Starting last year, if the engine idled for longer then 3-4 minutes, the CEL would come on. It was having a code #21 about the 02 not reading rich/lean. If I turned the Jeep off and restarted, the code would go away. Well, the other day the code would not go away any longer, and the OBD1 reader also mentioned the 02 sensor was shorted on the high side, or something like that, so decided to swap out the sensor.
The 60k mile sensor, some deposits on it, not terrible:
I did not have a new sensor, BUT I had a sensor I pulled out of my green Scrambler after 1,000 miles of use. Not sure why I pulled it, or kept it, but I installed it. Well, the CEL came on while driving, AND I actually got "stumbling after hard acceleration issues" and other drivability issues!! I never thought a bad primary O2 would cause drivability issues, but I guess so!! Installed a new NTK sensor, no CEL and no issues. Ordered an extra NTK sensor to keep in the spares box, too. Now I know why I pulled this O2 sensor out of my green Scrambler !!!
Swapped in a new volt gauge, still a work in progress:
This gauge is a bit deeper than the original gauge, so the light bulb wiring fouls up so hard against the defroster duct that I can not install the bulb!!! I don't want to, but I will probably have to install a spacer ring on this gauge to space it out so the light bulb will install. Eliminating the defrost is not an option. If I space the volt gauge, will probably space out the oil pressure gauge, too, damn OCD!!!
And finally figured out why this secondary coolant gauge was not working:
The temperature gauge in the speedometer cluster works, BUT I added this gauge a few years ago just out of curiosity. It was supposed to be temporary, but I kind of got used to it. Anyway, it will intermittently work, and usually read way too low. Good ground, good power, so I looked at my sending unit wire. I cut both ends off, crimped on new ends, it has been working perfectly. I assume I had a bad connection at one of my crimp ends. Regardless, it is working, and I am happy!!!!!!!
This is a stock 4.0, with a 195 degree thermostat, stock fan clutch and stock 2 core radiator. It runs consistently between 200-210 degrees. Also, it was 97 degrees out, with humidity factored in, closer to 107 outside. I do not think this is too hot, considering my first 2005 TJ ran at 210 degrees for 165,000 miles, and my 2005 LJ has run at 210 degrees for 148,000 miles. With the OBD1 scan tool plugged in, the red Scrambler reads 205. This engine coolant sensor is located in the thermostat housing, as is the gauge sending unit. So, it runs 200-210. Happy with that!!
That's it for now
