Thread: air fuel ratio

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just go to any auto parts buy an after market one wire gm o2 sensor they almost all the same 30.00 dollars or so. don't by the 2 wire that second wire is for a heater makes the sensor heat up faster you don't want that make sure the exhaust sys has a good ground or put a short sheet metal screw into the pipe hook a ground wire and run both wires into the cockpit hook the o2 wire to the positive lead and the ground wire to the negative lead of the dvom the o2 sensor is actually a battery that produces millivolts it samples out side air at 21% o2 and the exhaust o2 content the bigger difference there is the more voltage it produces in the combustion process o2 is fuel it burns and is converted to co2 carbon dioxide the the lower the o2 content the more dissimilar the compounds are the higher the milivolts its an electrolysis process like a battery I have a chart that will convert the dvom readings to a/f ratios packed away in my old stuff from my days of teaching I just have to dig it out I am sorry I haven't had time my wife is not doing well and I spend alot of time taking care of her but I promise I will find it and post in the next day or two.....ted