[Gmecm] Modify $8D to work on MPFI 3.1L DIS engine

[davesnothereman at netscape.net]

On a 4 cylinder engine the "double notch" of the 7x crank wheel indicates synch.  The module fires on the next signal from the crank wheel.  Two pulses are counted and the module fires on the third.  One pulse is counted, then the double notch to indicate synch, and the cycle begins again.
 
Zaphod
 
-----Original Message-----
From: Robin at FuryWorld.fsnet.co.uk
To: gmecm at diy-efi.org
Sent: Sat, 2 Sep 2006 6:46 AM
Subject: Re: [Gmecm] Modify $8D to work on MPFI 3.1L DIS engine


> On Friday 01 September 2006 04:31, Robin Handley wrote:
> >
> > I hadn't thought about the cranking situation, but I'm now wondering how
a
> > DIS based ignition system can actually get an engine to start (when the
> > 'static' advance is so far away from something you'd want to use for
> > cranking). Does the DIS module do something clever here, that I'm
missing?
>
> Nope, when cranked (when the ECM is *not* controlling the timing), the DIS
> module just fires the coils at the crank mark timing (the static timing,
> typically of 0deg), and only the signal it gives back to the ECM has 60deg
> offset.

Sorry if I'm being dim here; when the ECM is not controlling the timing,
does the DIS module fire at every pulse from the trigger wheel? How does a 6
x 60deg trigger wheel work for a 4cyl engine?

Thanks,

Robin

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