O2 sensor plug?

[rsammel]

Just finished overhauling my exhaust, and everything is back together - except that I couldn't extract (I'm assuming) the O2 sensor plug from the old front exhaust pipe.

 

Does anyone happen to know the dimensions and thread size of that bolt? It's an 87'.

 

Thanks!

[HOrnbrod]

Are you trying to remove the O2 sensor from the exhaust pipe bung? If so the wrench size is 7/8". The O2 sensor thread size is  M18x1.5, same as a spark plug.

[rsammel]

No O2 sensor on my truck, it's just got a bolt that plugs the hole. You answered my question - The thread size was what I needed. Thanks.

[buckwheat]

No O2 sensor? How does that work? Does the ECU just push the pre-programmed fuel air ratio without compensating?

[Eagle]

No O2 sensor? How does that work? Does the ECU just push the pre-programmed fuel air ratio without compensating?

I have the same question. If you're driving it around with no oxygen sensor, the ECU must be in open loop (warm-up) mode all the time ... which means your fuel mileage must be in the toilet.

 

Or did you go retro and install a carburetor?

[Crash]

87 is renix, they will actually run decently without an Os2 hooked up. Yes, they do run on ECU parameters, but they do run. A while back when my O2 was failing on my renix XJ, I disco'd my O2 sensor and it ran fine until I could afford to buy a new one. 

[Eagle]

But it runs in open loop mode, which is -- by default -- a very rich mixture. It's got to hurt gas mileage to run like that all the time.

[banshee]

I use mine for off-road mostly when my O2 died I thought I had a hole in the tank drank fuel, my best guess it was getting like 6 mpg

[cruiser54]

They WILL run, but not as good as they will having the O2.