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O2 sensor test. 700

posted by  someone claiming to be zvolvo on  Thu Mar 27 17:11 CST 2008 [RELATED]

i am testing the functionality of my o2 in 91 740wgn non turbo.according to the process in the brickboard .when key is set to start position (engine off)it should read battery voltage at heater power wire(red).i don't see any voltage drop until the car is running.it does the same in my 93 940 sedan.also when probing the signal wire(white) and sig return(green) the voltage fluctuate
between .01 and 1.1V,but when i remove the vaccum line to FPR or create a vaccum leak the reading stays always the same.does any one have a detailed info on how to test o2 sensor?i am doing this because i am getting bad gas miles(16 to 17mil/gal)(10%ethanol in gas) here in new england.all tune up is done,tire presure,gas filter,new breaks and calipers.cleaned and adjusted throtel and intake (no vaccum leaks),still need to clean injectors,and probably try another temp sensor.thanks






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