Anyone know of such an adapter?

[randy 77zt]

never heard of different size 02 but a muffler shop can weld a standard 02 bung in and weld up the oem hole if it is not in too tight of a place.all 02 sensors put out same signal.i have a 4 wire ford unit in my 77/81zxt.

[SleeperZ]

Apparently I need a strange type of O2 sensor for my '87ZXT ECU to function properly, and the stock (non-universal) part has a smaller bung fitting than the normal 22mm. Has anyone heard of a (stainless) adapter that will interface the 17mm sensor with a 22mm bung? If anyone can tell me more about the screwy O2 sensors on the 300ZX turbos, I'd appreciate it.

[SleeperZ]

Well, that's what I thought too. But according to the 300ZX service manual, the N/A uses a normal O2 sensor that generates 0-1V in the presence of )2 in the exhaust. The turbo ECU uses a different sensor that changes it's resistance in the presence of O2 in the exhaust.

 

I have not verified the different O2 bung size, but thats what I have gathered from searching the archives at Z31.com. They can't seem to answer my question over there though. I suppose I shall just purchase the correct sensor and see if I can have an adapter machined.

[Guest Anonymous]

It is a different material in the sensor that is apparently more preferable. You can't substitute the universal ones for it. There is an adapter, but I'm not sure where to get one. I think if you found a late model Z31 turbo, you might be able to unscrew it from the manifold. Not positive those come out.

[SleeperZ]

Well, here's the skinny, if anyone is interested. The adapter from Nissan doesn't work, the thread is huge, wont fit in the 18mmx1.5mm thread for the "normal" O2 sensors. I bought a 18x1.5 oil drain plug, chopped off the hex end, drilled it out and tapped it for the small O2 sensor (12mmx1.25mm), and made my own adapter.