[oharris]

I decided to upgrade my 1 wire sensor to a 4 wire sensor on my 2.3T swap. I'm running an LA3 computer which used a 3 wire originally. A 4 wire seemed like an upgrade. I used an old sensor I had laying around from an explorer but now it's running really rich (according to my Wideband anyway). I tested the narrow band with a propane torch and I could just barely get it to .8V so I think that is my problem. Should I just get another explorer sensor or is there a better option? Are narrow band sensors pretty much all the same?

Thanks in advance.

[LeadHead]

If you didn't run the signal ground all the way back up to the computer, then the 4 wire is not really an upgrade at all.

[oharris]

I did run the HEGO ground from the computer to the sensor ground on the 4 wire sensor (it was connected to the turbo housing) and the heater wires to power and ground.

[LeadHead]

and did you verify you got that same 0.8v up at the computer?

[oharris]

I did not check the voltage, but I did go ahead and replace it with a new Motorcraft sensor. I haven't driven it much, just around the block a couple times, but it now runs much closer to stoic.