I asked this question in my barely moving build thread to no interest, so this should be a better spot. Just put on a Pacesetter I already had, and there's nowhere for an O2 sensor. I asked the muffler shop guy to bung pipe 3 around the stock area so I could continue to use a 1 wire O2, but it seems it isn't as simple as him putting in the bung and me screwing in the sensor. I'm really confused because I've installed this sort of stuff in other vehicles and just traded O2 sensors right over. What am I missing?

 

It's more accurate, I believe, to put the sensor where the pipes collect. That way you're reading all cylinders on average.

Why can't he put a bung wherever you want it?

 

He sure can bung it anywhere, the only reason I wanted pipe 3 is so it'll be far enough upstream that I can continue using a 1-wire O2. Putting it down where the pipes collect would also be fine, I'll just convert to a 4-wire heated sensor. The problem is, he claims for some odd reason I need more than just my screw in O2 and his bung that it screws into. Something about the inside that the original manifold has? Is there some piece I'm missing here? He didn't dispute the location, suggested it actually, but he says it just doesn't work the way I have it. Am I misunderstanding him?

EDIT
Or is he misunderstanding me? Does he think I'm wanting to use the bolt on each side O2 the stock manifold has? If pictures are needed just say the word, but I assume anyone with the knowledge to answer this understands what I mean.

 

Put it there it will be fine just weld the bung in and your good to go.

 

I like that, now just to be 100% positive, you say weld the bung in pipe 3 (stockish area), screw in the O2, and hook it up and go, right?

 

That's what I did. Worked great. I took a header for an 85 which had the bung up high but my 93 had the o2 sensor down by the transmission. So I put mine where the stock one went and away I went. Often times shops will tell you to do thing to cover their butt legally. IE... Using a torque wrench to put on lug nuts. I don't think I have ever used a torque wrench for lug nuts.

 

Good to know. I also researched even harder yesterday outside of this forum and found some info on this topic. No link (sorry), but it was a 350Z forum. Good info from a guy who was installing a wideband. He even mentioned how far downstream he would mount his relative to the ancient 1-wire system, which of course is what we have. Them he just bunged it and went on. So I guess the exhaust shop guy misunderstood me? Idk, it was odd.