Leaderboard

It sounds like it's in limp mode. Exhaust getting that hot is probably due to the misfire (unburned air/fuel mix hits the catalyst and burns there instead). First thing to do is run trouble codes, see what the computer thinks is wrong. If that gives you a cylinder-specific misfire, figure out why that cylinder isn't hitting. If it's not cylinder-specific, could be mixture. Check the rubber tube between the MAF and the throttle body.

Wow, that was quite the undertaking

I looked into it briefly, that sounds right. The kit will be useful for the job because it saves you some fabrication. Just make sure you install it better than the document describes, I'd totally recommend removing all the rust and welding in the part.

So I added a new harness and it seems to be working. I don't know if this deserves a sticky or not but It's an easy and cheap fix for this problem. Thanks here's the how to: nissan_o2_sensor_dtc_repairs.pdf