voltage on stock 02s
10-09-2005, 01:35 PM
#2
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Not sure I understand your question, but O2 sensors report a voltage based on the oxygen content in the exhaust, not heat.
Now, the sensors do require a warm up period when you start the car when their reported voltage will not be accurate.
Now, the sensors do require a warm up period when you start the car when their reported voltage will not be accurate.
10-09-2005, 08:33 PM
#3
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after making a couple of back to back runs it seams the 02s peak in a diffrent
spot at wot , is that because there alittle hotter after the first run.
spot at wot , is that because there alittle hotter after the first run.
10-10-2005, 09:03 AM
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There is a minimum temp below which the output
voltage will be depressed (the chemical cell needs
to be pretty hot to make output). So between cold
and some minimum working temp, more temperature
will increase the output. I do not know what this
minimum temp is, but cold output is zero....
However, above 500C or so further increase in sensor
temp -decreases- the rich output voltage. This effect
is in fact stronger than the effect of changing mixture,
at lower AFRs.
voltage will be depressed (the chemical cell needs
to be pretty hot to make output). So between cold
and some minimum working temp, more temperature
will increase the output. I do not know what this
minimum temp is, but cold output is zero....
However, above 500C or so further increase in sensor
temp -decreases- the rich output voltage. This effect
is in fact stronger than the effect of changing mixture,
at lower AFRs.
10-10-2005, 03:42 PM
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thanks jimmy temp does effect them, the hotter the less voltage. three runs
and they started at 920, 900, 880, as temp went up the voltage came down.
i think exhaust was at 850 degrees on scan tool.
and they started at 920, 900, 880, as temp went up the voltage came down.
i think exhaust was at 850 degrees on scan tool.