> On Wed, 2003-04-16 at 11:18, Herbert Graf wrote:
> > Does GM publish the pulse width vs. gas injected curves?
> > Anybody ever see these curves. Maybe the ECM gets a different
> signal where I
> > could determine gas used? (the mass airflow sensor, is there a relation
> > there I'm missing?).
> >
> > Thanks for any insight. TTYL
>
> You may have better luck on the GMECM mailing list, which is available
> at www.diy-efi.org.  Your first step would be to find out which ECM you
> have, and from there you can find out what sensors you have.
>
> The MAF alone would not work because fuel used is airflow and rpm (load)
> dependent.

        Hmm, I see.

> Something that measured Inj PW and used the VSS (vehicle speed sensor)
> would be my choice, although that wouldn't work when the car isn't
> moving.

        That's ok, when the car isn't moving the liters used per hundred =
infinity! :) I'll just display N/A in those situations...

> Tapping into the distributor reference pulse would be much more
> difficult though.

        Hehe, that would be true, if it used a distributor! :) It's uses a coil
pack, FWIW the injector signals, while not super clean, are easily readable.
TTYL

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