seattlejester Posted May 27, 2016 Share Posted May 27, 2016 Not belittling you, but it is as NewZed says, a narrow band reads stoich, lean, rich. It really doesn't tell you much, reading spark plugs would probably give you a better picture. I am guessing you have one of those sweep gauges that don't actually put out numbers which is why you can't give us any for that one. If you look up a narrow band voltage curve vs AFR you will see that all the voltage range the moment it moves off of stoic uses like 80% of the voltage, and it is exponential at that point if you flip the axis, that means the "richer" it gets the more inaccurate it gets. To have an accurate narrow band gauge you would need a very very advanced algorithm that could break down an exponential function and read all the way down to a very very small voltage unit, that would probably cost quite a bit as it would basically be a computer attached to a very precise multimeter. Comparatively the wideband sensor is a straight line. Much more telling. I agree though, if you can provide numbers that indicate a real decrease in fuel economy we can kind of go from there. If you plan on swapping out to megasquirt in the near future you will need a wideband o2 sensor so you could get one early. It could be something as mundane as a slipping transmission, if I remember you have an auto? Or something more complicated like a sticky injector. Quote Link to comment Share on other sites More sharing options...
rickyellow zee Posted May 31, 2016 Author Share Posted May 31, 2016 Its a 5 speed and I just did the clutch last year. Injectors were serviced last year as well. Im going to have it run on the dyno soon with a wideband hooked up and see what I get... Quote Link to comment Share on other sites More sharing options...
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