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post #16 of (permalink) Old 28th March 2007
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Originally Posted by hidnmine View Post
I don't agree that the ecu has to know precisely how much fuel is flowing to set the fuel air ratio correctly. So long as it has a rough idea, the precise adjustment is done based on the Lambda sensor output (i.e. Lambda sensor says lean mixture; lengthen injector on time etc). The mpg computer must do its sums based on the standard calibration values of the fuel pressure, temperature etc. Any inaccuracies in these sensors will inevitably give an mpg error.


So that's what the lambda sensor does.
Is there one of these per cylinder? if not how does the ECU know which injector on time to lengthen?
My point is that the injectors need to be calibrated or atleast matched (to a degree). Can one injector be replaced or must you alway replace them together to ensure they are still matched?

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