| and .8 volts. try this : warm it up, hold it at 1500 rpm. should see voltage above. the faster the o2s vary between .3 and .8 the better they are working and the better the fuel is under control. If they are fixed at the low end ( .3 .4 .5) you are lean. to verify this introduce propane to your intake while at 1500. if you see a change on the o2 then the sensor is good, you are just lean ( maybe injector - even though they "test" good)
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