proper voltage reading from an O2 sensor?
06-29-02, 07:32 PM
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proper voltage reading from an O2 sensor?
Hi all, I need a little help guys. I'm attempting a rough tune of my S-AFC off the O2 sensor. I've run into a snag though. I can't seem to figure out what voltage numbers would indicate a proper air fuel ratio. The FSM just says it should read under 1 volt. I'm getting readings of .12- .19 volts, I think this maybe indicating an overly rich condition. If someone has insight to this let me know.
06-29-02, 08:02 PM
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That voltage reading was taken with all the S-AFC's values reading zero. Somethings wrong here. I'm assuming the O2 sensor is bad. I dunno, the engine is definitely running rich with the hi-pressure Walbro installed.
06-29-02, 08:02 PM
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normal 02 sensors are like an on off switch. they go from off to on at about 14.7:1 air fuel ratio. plus they are affected by heat. so what you want to see at full throttle is .9. a good way to tell if your 02 is working is to cruise about 60-70mph and see if the voltage changes. it should flop back and forth between rich and lean.
mike
mike
06-29-02, 08:08 PM
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That helps explain the low voltage I'm seeing. I haven't run it at wide open throttle yet. Damn pump is putting so much gas in that I can't drive it.
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