HX Lean Burn
Hey guys, havent been on here in awhile, I just picked up a 2005 honda civic HX. I have been driving a 95' VX for the last 3 years and I am having troubles trying to figure out if the engine is going into lean burn. In the VX it was very noticeable, the car would jerk and then I would know. With the HX I do not feel this movement, I have not been through a complete tank of gas yet but my scan gauge is reading 33-36 mpg while doing about 60mph. Any suggestions? Is there anything on the scan gauge that would tell me?
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It is very difficult to notice when my lean burn kicks in. As far as I understand the scan gauge doesn't calculate lean burn mode. The scan gauge thinks you have a standard motor with a 14.7 a/f ratio. My scan gauge reads in that same region as yours and I get 45+ mpg.
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The Scangauge doesn't have access to injector pulse width. On many vehicles it also doesn't have access to fuel pressure.
I believe it uses MAF and O2 readings to calculate fuel rate. |
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O2 sensor data is part of the most basic subset of OBDII data. I'm amazed that it can't get O2 from your car. Perhaps it uses fuel trim instead.
MAF is the main data used to calculate fuel rate. O2 or fuel trim, if used at all, is just used for minor adjustments to accuracy. Here's a list of OBDII data accessible by standardized means. https://en.wikipedia.org/wiki/OBD-II_PIDs Not all is available in all vehicles, but anything outside of it is likely to be a manufacturer-specific extension to OBDII. Injector pulse width/duty cycle is not part of basic OBDII; it is part of manufacturer-specific extensions. |
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Here is the thing though... if the o2 sensor is required for calculation of fuel economy, then how and why is it that fuel economy can be calculated with the o2 sensors disconnected?
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The O2 sensor is only for minor adjustments. MAF is the main data used to calculate fuel rate.
It can be approximated from other data with reduced accuracy. For example, RPM and displacement can be used to guess. I'm not sure which other variables could be used to calculate it, off the top of my head. |
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