3.4 No. 2 O2 Sensor (1 Wire)
 

When I bought the rig the engine swap had already been done. Recently I had all the emissions equipment put back on including the CAT... We replaced the No 2, 02 Sensor, which was a one wire, with a 4 wire. It passed emissions with flying colors but ran like crap. As soon as I disconected the No 2 sensor it ran great.

I've got to find another 1 wire for this thing and get it hooked back up the way it was when I bought it... Any ideas on where I can get my hands on one. Everything I'm finding are 4 wire for before the cat (No 1 sensor)... Thnx.

Not sure of your question... both O2 sensors on my '96 3.4 were of the 4 wire variety.

There is a way to make a "fake" after cat O2 sensor however.

I copied JasonD (starts on page 10 of my swap):

https://www.yotatech.com/forums/f160...5/index10.html

Yeah, what Elvota said. Mine is a 4 wire as well, two for the heater and two for the sensor itself.

I thinkt that's what was done (the fake)... It's kind of hard to come into a swap that's already been done, not really knowing what the swaper did... I'm pretty sure at this point I'm going to redo the entire harness but I'd like to wait until after the wheeling season out here.

What I do know fore certain is... this thing does NOT want to run with that four wire in place; not the way things are wired now.

Thanks for the help...