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If I'm not mistaken, I think you guys are confusing measuring pulse width off the injectors (MPGuino wasn't obdii was it?) with what I'm talking about. The "Pulse width" I'm carrying on about is the J1850-PWM OBDII protocol. The J1850 protocol uses VPW (a single wire) or PWM (a balanced bus 2-wire) at the physical level to send the bits. My car (1998 mustang) uses the PWM flavor of the J1850 protocol.
It should be every bit as accurate as a scanguage, because it's pulling the same information and running the same formula against it (calculating based on speed and MAF reading from the OBDII port rather than reading off the injectors).
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