Well with just a PO135 present the ECM is going to be running in open loop. Meaning the ECM is not accepting O2 sensor data to add fuel or take away fuel to the engine. (adjusting short term and long term fuel trim) When the engine is ignoring O2 sensors it is undoubtedly running very rich.
Properly diagnosing thr O2 sensors would be my place to start and then move into the running hot issue.
You dont drive this everyday do you?
All four of them should be diagnosed. Maybe start with a visual inspection of the wiring and connectors at the ecm and at the O2 sensors.No sir it's not my daily. So far I've not had the confidence in it but to take short shake down trips.
Should all 4 O2 sensors be replaced?
**UPDATE**
Driving the Jeep in to work this morning, 13 miles, 18 minutes or so, 69 degrees, engine didn't get up to 200.
View attachment 22539
So what does this tell me?
I would take that as a crap thermostat. You needed to swap it out anyway, get one from Mopar.**UPDATE**
Driving the Jeep in to work this morning, 13 miles, 18 minutes or so, 69 degrees, engine didn't get up to 200.
View attachment 22539
So what does this tell me?
**UPDATE**
Driving the Jeep in to work this morning, 13 miles, 18 minutes or so, 69 degrees, engine didn't get up to 200.
View attachment 22539
So what does this tell me?
Looks like a thernostat issue. I believe the thermostat is supposed to be a 195*. Jeeps are very picky.
Why is that, jeeps being picky?
He had a 185 T stat installed and it didn't get to 200. Why do ppl think it's faulty?
I wouldn't expect engine to get to 200 with a 185 tstat on a short drive in mild conditions.
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