May have been wrong all along

[Programmer]

Could there be "asynch" operation for cold start up ?? I'm moreso
thinking of a certain troublesome truck with PCM # 16196395...just
a hunch ...

Lyndon.
----- Original Message -----
From: <rrauscher at nni.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, March 15, 2001 1:01 PM
Subject: Re: May have been wrong all along


> Sync is when the injector(s) fire coinciding with a distributor
> reference pulse. Async is when the injector(s) fire at an 80Hz
> rate. This coincides with the ECM minor fuel loop code.
>
> Sync is used 99% of the time. Async is used when the desired
> sync pulse is too short to be accurately metered. The pulse
> widths for min's, max's, switching between the two are all in
> the code (or data tbls).
>
> Then there is the quasi-async pulsing. This is when both sync
> and async are taking place together. Such as pump shot.
>
> This is how the '747 & '8746 handle it. Others may vary.
>
> BobR.
>
>
> >Can you explain this "synch" and "asynch" operation ? (When you have
> >time...)
> >
> >Lyndon.
> --------------------------------------------------------------------------
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