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Help interpreting oxygen sensor data
Hi,
After seeing a decrease in mileage on my 96 Ford Taurus wagon (~ 24 to ~20 mpg. 140.000 Mi odo), I decided to take a look at my oxygen sensors as a possible culprit. I read out their voltages during idle when warm using my Elm ODB scantool, and plotted them. http://www.duijn.info/OxygenSensor.jpg x in seconds, y in volts It looks to me that something is fishy in Bank 2, but the signal does not look like the typical error modes that I read about (sluggish, low, flat). Bank 1 looks like the examples I saw for good sensors. I am not experienced enough to make a statement on these curves, but am hoping they ring a bell with one of you people. Does it look familar, is my data aquisistion simply too slow (I don't have a scope, sorry...). The peaks in sensor 2/2 also look like they don't belong there. Is the fuel injection acting up due to bad info from sensor 1, and too rich a mixture making its way through the cat? The traces were recorded separately to improve time resolution... If a sensor is indeed bad, is it doable to replace it with just basic tools, or is it best left to a pro? Thanks for any thoughts you may have. Martijn |
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