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Another interesting bit of technology brought up by the instructor was; low fuel levels and their corresponding effect on PCM Controls. It is pretty widely known nowadays that OBDII PCM s monitor fuel level via the fuel gauge or a secondary tank reporting device. Initially, this was done so that the PCM will not perform an Evaporative Emissions Test if fuel level is greater then 3/4 or less than 1/4. If you ve ever heard some drivers report that, when fuel levels are below 1/4, it ‘seems like the fuel level falls off even faster, as if the engine is using more fuel. Turns out, this is not too far fetched. O ur instructor stated that many PCM calibrations force the fuel injectors to spray a richer mixture when fuel levels are below 1/4. On these cars, the PCM is intentionally programmed to enrich the mixture for fear that the fuel pump will suck up an air pocket. If this occurred, a lean misfire could result and this would be noticed by the driver. As we have seen many times in the past, today s PCM s have the ability to mask more and more problems.
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