I replaced the O2 sensors in my '94 Z28 A4. I have headers and full exaust swap. What I found on the passenger side is a loose wire. Its black (main color) with a white stripe. On the end is a "eye" let. It looks like a ground, but I don't wanna hook it up wrong, and fry something. Car ran somewhat ok, I was fouling spark plugs out every 600-800 ,miles, Wires from passenger side 02 where melted. Both O2's were heavily soiled with soot. So I'll find out about this one wire and see where I lay.


PS Car ran awesome when cold, sucked donkey when it warmed up, thats why the O2 swap, (older than hell)

 

I think that's a pcm ground wire that you're looking at. There should be a threaded hole right under #5 spark plug. It usually has a stud and the wire is held on there with a nut.

 

It's actually under the #6 plug.

 

I've been working on fords lately...

At least they're diesels...

 

I feel for ya'.

 

Thanks. haha

 

thanks everyone, was annoying me that I couldn't figure it out....and SHOEBOX...AWESOME SITE< has been helpful since I bought my Z