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11-23-2009, 05:51 AM
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#1
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Registered Member
Join Date: Apr 2008
Posts: 6,624
Country: United States
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ScanGauge O2 sensor values
When using an O2 sensor XGauge (from the XGauge examples PDF), the range is 0-99. How does one interpret the reading? What number would be stoich, which direction is lean/rich, and how far does it have to go before it's abnormally rich/lean?
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11-23-2009, 07:17 AM
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#2
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Registered Member
Join Date: Apr 2008
Posts: 1,831
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I think jay did a lot with this to detect DFCO on his vehicle.
he may be a good resource
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11-23-2009, 07:41 AM
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#3
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Senior Member
Join Date: Dec 2009
Posts: 383
Country: United States
Location: Bay Area, CA
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If you want to display A/F ratio, it's worth investigating whether you can program an A/F xgauge. I was able to get one working on my CAN protocol Scion, but not with my (older)ISO protocol Nissan.
Unfortunately, the A/F display isn't very helpful. The leanest ratio I've seen so far in limited testing is 14.6:1. It goes to 18.9 with the engine off. I think I'll try this wideband oxygen sensor.
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11-23-2009, 08:06 AM
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#4
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I know I had an A/F XGauge working correctly once before, but I tried one yesterday and it didn't work. I was able to observe O2 data and I'd like to know what I saw.
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11-23-2009, 09:38 AM
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#5
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Site Team / Moderator
Join Date: Sep 2008
Location: Northern Virginia
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I've tried the a/f xgauge, after a day or two I got bored with it. The number doesn't change much on my vehicle, maybe by .1 every once in a while. The O2 sensor reading will be 0 in DFCO. In most driving it will be in the 50's-60's. The highest I ever recall the reading being is 80 or 81.
-Jay
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11-23-2009, 09:43 AM
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#6
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Registered Member
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So when it was 80 or 81, was it rich or lean?
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11-23-2009, 11:35 AM
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#7
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Site Team / Moderator
Join Date: Sep 2008
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Quote:
Originally Posted by theholycow
So when it was 80 or 81, was it rich or lean?
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THe higher the number, the richer the exhaust. For some reason the o2 reading spikes to 79 or 80 a fraction of a second before DFCO kicks in. I have no idea why though.
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