Oxygen sensor

[kolls]

Ok, somebody explain to me how to test the oxygen sensor, the procedure is to use voltmeter one side to ground and one to oxygen sensor... so how do you hook it up to oxygen sensor... do u unplug it and connect t0 plug ???

[majicwrench]

Well, good luck, but here goes.....assuming you have a decent digital voltmeter. If you have a lab scope all the better.
Get engine and thus sensor good and warm. Hook neg term to ground and pos term to sensor wiring. I assume you have a single wire sensor?? Just leave sensor plugged into harness and tap into wire. Run engine at 2000rpm. SHould see voltage toggling around, .2, .7, .8, .3, etc etc. between .1 and .9 volts. Voltage not toggling is bad. If volt stuck one end of scale or other, say .1 or .9, that could be a bad sensor OR it could be running to lean or rich respectively. IN which case you need to induce the opposite, if reading .1 steady (which is lean) try making it run rich by pissing some carb cleaner into vac hose, bllipping throttle, something. If reading .9 steady (too rich) try inducing lean, pull vac hose etc. If reading still stuck you have a bad sensor.
For a sensor to work well and for a sensor to be tested ENGINE NEEDS TO RUN WELL. If you are testing a sensor on an engine that is stumbling, rough etc YOU WILL NOT GET A GOOD READING.
Keith

[kolls]

Thanks Keith . You gave me my answer