Re: 1226519 ECM 160 baud ALDL output

[Louis Baiani <neptilou@attcanada.net>]

I pretty much covered all that before I got to the HEI module.  Now i'm starting
to thing I have a floating ground.  I'm going to look more into it.  Thanks for
the info.

Louis

Ludis Langens wrote:

> Louis Baiani wrote:
> >
> > I made an adapter to read the ALDL info from the 1226519 ECM (closed
> > loop carburator control - CLCC) for an 84 Century.
> >
> > The distributor was
> > never isolated, so I unplugged the 4 terminal HEI connector to the
> > computer.  I have found that this cured the problem, and the data is
> > perfectly fine.
>
> You aren't telling us much about your adapter.  Where does it get it's
> power?  If the power comes from the car, how well is this filtered?
> What sort of signal level conversion do you do, if any?  Try running
> your adapter (and your laptop or whatever) from a battery.
>
> This carb ECM outputs the ALDL on the check engine light, correct?  You
> might want to pull the bulb out because the other end of the bulb lives
> on the noisy 12 volt vehicle power circuit.
>
> --
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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