Re: 1226519 ECM 160 baud ALDL output

[Louis Baiani <neptilou@attcanada.net>]

You're on the right track.  Just about to do those things :)  Thanks.

Louis

Programmer wrote:

> Check a couple things:
> 1. Centre coil button should be over 3K ohms
> 2. Ground strap from coil missing ?
> 3. Condenser failure ?
> 4. Poor distributor base ground ?
> 5. Corrosion between module and distributor ?
> Lyndon.
> -----Original Message-----
> From: Louis Baiani <neptilou@attcanada.net>
> To: gmecm@diy-efi.org <gmecm@diy-efi.org>
> Date: August 24, 2000 7:26 PM
> Subject: 1226519 ECM 160 baud ALDL output
>
> >I made an adapter to read the ALDL info from the 1226519 ECM (closed
> >loop carburator control - CLCC) for an 84 Century.
> >
> >With the ignition off, the data output is perfectly fine.  Once the car
> >is started, the data is fine for a short time, then it becomes garbled,
> >as in out of sync...enough to change all the values for that update
> >interval.  Some times the data stays fine for a few mins, some times
> >after a few secs.  Most likely will screw up when accelerating.  Not
> >alternator noise, because I took off the belt and/or connector.  I have
> >tried to filter with different supplies/chokes/caps to try to rectify
> >the problem.
> >
> >Just today I thought again on what it could be.  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.  Could it be a bad HEI module? (internal amplifier?)
> >Had anyone heard of this?  Should I use a scope to look at the signal?
> >
> >I would also like to find ALDL info on an 84 Vette, 5.0L (L83 engine).
> >Please help.
> >
> >
> >Louis
> >
> >
> >
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> >
>
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