rsammel Posted June 28, 2015 Share Posted June 28, 2015 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! Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 28, 2015 Share Posted June 28, 2015 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. Link to comment Share on other sites More sharing options...
rsammel Posted June 28, 2015 Author Share Posted June 28, 2015 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. Link to comment Share on other sites More sharing options...
buckwheat Posted June 28, 2015 Share Posted June 28, 2015 No O2 sensor? How does that work? Does the ECU just push the pre-programmed fuel air ratio without compensating? Link to comment Share on other sites More sharing options...
Eagle Posted June 28, 2015 Share Posted June 28, 2015 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? Link to comment Share on other sites More sharing options...
Crash Posted June 28, 2015 Share Posted June 28, 2015 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. Link to comment Share on other sites More sharing options...
Eagle Posted June 29, 2015 Share Posted June 29, 2015 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. Link to comment Share on other sites More sharing options...
banshee Posted June 29, 2015 Share Posted June 29, 2015 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 Link to comment Share on other sites More sharing options...
cruiser54 Posted June 29, 2015 Share Posted June 29, 2015 They WILL run, but not as good as they will having the O2. Link to comment Share on other sites More sharing options...
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