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Originally Posted by ShadeTreeMech
On my scanguage I can see the dfco kick in by the GPH reading (gallons per hour) because it will kick over to 0 fairly quickly when I let off the throttle. I suppose the o2 sensor would stay in closed loop if the ecu "knows" the o2 readings will go off the charts during dfco. Of course, the reaction of higher o2 readings is to spray more fuel, so if the injectors are cut off that can't exactly happen.
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I can visually verify via tach that it's DFCO-ing. However, it stays in closed loop and my SGII doesn't go to 9999 MPG. I'm going to program O2 and AFR X-gauges here shortly and see what I see on my way home from work today.
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AFAIK there isn't a a/f ratio guage built in, I suppose it might be an xguage. I do know you can read up to 4 seperate banks of o2 sensors with the right xguage though.
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I know/knew they existed; I just hope that my specific car make/model reports the information.
