O2 sensor wire question for all you gurus...
 

This is on an 87 T2...just to get that out of the way.

So...When I did my Jspec swap, I ended up not being able to find the O2 sensor wire coming off of the wiring harness. Because of that, I believe that is the reason for my poor gas mileage and the rich fuel mixture. I think that I may have found it today. I found a black wire with grey shielding around it with a male connector. the O2 sensor connector is also male. The connectors were different sizes but for shits and giggles I touched the connectors anyway. My car idled a little smoother and the massive fuel smell kinda dissipated. I wanted to know if I in fact found the right wire and just need to splice in a new connector or get a new O2 sensor.

Can you take a pic? Is it a Jspec Harness or a Aspec Harness?

Aspec harness. I can't take a pic because I don't have a digi cam.

bump

I can think of only 2 wires that are shielded. That is the CAS and 02 sensor.
The wire is black and has a shielded wire around it but not all the way to the connector. It's in the area where the BAC connector is located.

Yes, you have found the correct wire... like what "boosted1205" said, although I'm quite sure the O2 wire(blk-grey sheath) is the only electrical shielded wire... pull back the grey sheath and you'll see bare shielding wires woven around the O2 signal wire. The BAC wire is just sheathed to protect against heat.

...different connectors? It's understandable, many replacement O2 sensors come with different connectors and the original plastic O2 connecters get cooked (located above turbo), and are usually replaced as well.

I don't know how long you've been running this way... just connecting the wires may be enough. Running rich can be as damaging as running lean... fouls plugs, damages sensors, cat-convertors... the excessive fuel prematurely breaks down motor oil, washes away protective oil film on rotor housings...

Single wire sensors are cheap, and I would change or at least clean spark plugs...
change oil, reset ECU, and the ignition timing.

Sensei;)

thanks guys!!!
I'm glad that I found it! I was hoping that I wouldn't have to splice in from the ECU....