What's that wire?
 

https://cimg2.ibsrv.net/gimg/www.rx7...0c6c393f4c.jpg

S4 Tii

It's the black wire with the brown shield, next to the BAC plug. Maybe the O2 sensor, I've been having trouble locating that plug....

It's been over a year since I took this all apart.

i think o2 is correct

Well shit.... I wonder where the connector went :scratch:

yes that is the O2 wire, though the knock sensor on the S4 looks almost identical but that placement is for the oxygen sensor.

I'm not seeing that it is a shielded wire. I read around and it seems that it is supposed to be. Am I missing something here? Other than the connector, which is probably long gone...

Ha! Found the little bugger! It got caught under what I think is the solenoid for the fuel pump? the silver thing with the heat sink behind the passenger side head lamp. Of course there is no wire left on it though

I was able to remove the spade connector from the plastic housing. No spade connector you will find at an auto parts store will fit inside of the original connector housing. It's something most likely found at a computer/ small electronics store, when I find an exact replacement I'll do a little write up on fixing it right. For the mean time I found some weather proof, spade connectors. 22-16 AWG Female .25" that fits perfectly on the stock male side of the oxygen sensor. It is fully insulated (insulated to the end of the connector) so it is just as resistant to weather as the original.

When using these connectors, crimp on the crimp point just enough to break the heat shrink off of the connector (so it doesn't rip down the side as you crimp the wire), use dielectric grease on the connection, crimp the wire, put the heat shrink back over the end, and flame. My wire shielding is brittle and cracking so I taped up the rest of the exposed shielding down to the brown shield with super 33+ electrical tape (It withstands high and low temps better that the 700).

You can use a non weather proof spade as long as it is fully insulated and then put your own heat shrink on to make it a little easier. It would probably be a little cheaper and work better than the pre-weatherproofed connectors @ $6+ for a box of 10 and your first couple probably won't work the way you want...

Anyway, there was no extra metal shielding on this wire as I've read others suggest that there is. The last of my parts should be here Monday so I'll let everyone know if that gives it a good reading or not as soon as I get everything running.

in theory i like to try and keep everything original looking, in practice i cut off those old antiquated connectors and put on something newer and more common. ;)

I'd love to make it all nice and what not, but this thing has nickle and dime'd me to death! I just want to get it moving at this point... I miss the feel of a sports car under me :( even if it is a poor man's version :lol:

Spade Connectors with Locking Tab 22 gauge 6.4 mm. to replace the stock connector

I believe it is a 22 gauge wire, but I'm not 100% on that.

Must be 6.4 mm to fit right!