XFI 02 went haywire this afternoon, then its ok???

[Toby_Goodmk]

I had an unusual issue with my 02 circuit on the XFI today. I took it for a drive since the weather was nice here. I noticed my 02 trouble light illuminated on my E-dash. So I looked at my readings that seemed quite lean (15.9) pulled over, and cleared the code. Pulled back out, light illuminated again. Making sense of the obvious lean reading I turned around (which was just in my neighborhood) and pulled into the garage. So I went through the usual suspects. Wires laying on down pipe, wires grounding out, wires disconnected, etc.. All was ok. I even looked for vacuum leaks, nothing. So Cal advised to take voltage readings. Before I took the readings I removed the sensor and looked for any soot and just cleaned it up. I looked for an unusual activity with the sensor outside of the down pipe so I turned on the ign with the sensor and the reading went immediately to 15.9. I thought this was odd.

I went into the house to pull the schematics for the 02 circuit to test the voltages to see if I could find if the 02 sensor was malfunctioning. After taking some readings that appeared normal at KOEO I started the car up and the 02 circuit started working again. WTF right?

So later this evening on a completely cold engine I turned the IGN on again. Actual A/F went to 15.9 for a second, then settled down to 14.2:1. Started the car, and 02 circuit is working fine still

It seems like it may be a bad 02 sensor?

I am looking for others that have XFI to let me know the way your 02 sensor is operating at KOEO as well as if anyone else had a sensor go bad on them, and were these symptoms similar to yours?

I dont want to be running the car and have the damn 02 sensor go out on me, would rather replace now and be safe.

 

[bison]

Key on engine off should be 15.9 because that's the leanest it can display. If you had a device that could read actual it would be 20.9%


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