ChromeToaster

Hello all, brand new member and new XJ owner. XJ was sitting aprox 4 years with a blown head so I put her back together with new head, cleaned the throttle body which was disgusting full of carbon, all new sensors on the TB. Starts and idles great! Drove around town everything fine for about 20 mins then it will kick code P0122 and P0107 with the CEL and idle will start to fall and stutter eventually stalling. Restarting seems to reset the clock and same when I delete the code it will run again for about 18-20 mins driving around and then kick the codes again. Anyone have any similar conditions? I have a couple new connectors in my cart on rock auto maybe it's just the old dry wires? Any reason these 2 codes are tied together? Thanks!

exasemech

Any reason these 2 codes are tied together?

Yes. Both sensors related to those codes are on the throttle body that you cleaned and you replaced both sensors with who knows what.
Put the old sensors back on, make sure the rubber elbow to the map sensor is not leaking, and see what happens.

ChromeToaster

I used NGK/NTK for those sensors, the old ones were buggered on the inside but I can test with them and see if it will run at all. I had to floor it to idle with the original sensors. The MAP rubber boot looked great but the vacuum elbows that mount lower on the intake are all pretty crummy looking, haven't been able to source correct sized replacements for those yet. I've been driving the XJ all morning with no CEL or running issues so far some how. Got it to pass emissions and getting new tires now. She's back on the road minus this issue if it persists. I suspect the wiring since it's very very dry and cracking.

ChromeToaster

Okay reinstalled the original sensors they are working so far drove around about 20 mins no issue yet, noticed my crap autozone radiator is leaking after 2 days... I'll update if more issues arise with same codes. Thanks.

ChromeToaster

Still testing, but so far the cure was cleaning the ECM grounds, pulled those off the firewall/fender and there was almost zero metal to metal contact so cleaned the screws and used a dremel to take the paint back where it contacts and she has run great for a day since then with no new codes.