[Gmecm] Port injector wiring

[Robin Handley]

Curtis,

You've worried me! The information that I've been using - a printout of
http:///www.customefis.com/GMEFIDIY.html (which isn't there anymore as it is
now a pay site) says that the 1227730 and 1227727 are port EFI ECMs, that
'port EFI ECMs fire all 8 injectors once every revolution (usually)', and
that 'port ECMs use saturated, or high impedance injectors'.

So, I'm still confused as to how to wire up my 4 port injectors (which, as
you guessed, are high impedance Bosch ones).

Thanks,

Robin

----- Original Message -----
From: "Curtis W. Moore" <cmoore440 at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: 26 April 2006 01:18
Subject: Re: [Gmecm] Port injector wiring


> Robin,
>
> This is my first post. I've been hanging for awhile just reading. I'm
> am interested in your post, and hope others chime in. I too am
> interested in using a 1227727 to run a 4 cyl port engine. Here is some
> of the high points as I have learned. Hopefully learned right. :)
>
> 1227727 uses low-Z injectors. You will most likely be running high-Z. I
> don't think this will be a problem. See what everyone else says.
>
> 1227727 pulses the injectors every other ignition event. That should be
> 4 times for 2 revolutions of the crankshaft. (8-cyl)
>
> Factory 8-cyl engines use what I think is called a "split plane"
> manifold. One injector will feed 2-cyl on left bank, and 2-cyl on the
> right. One pin would not feed one bank, and the other another bank. One
> pin would feed half the engine, and one pin the other half. I would
> have to see a manifold to tell you exactly what cyl are being fed.
>
> I think I will wait for others at this point. This should be enough to
> start out with. If I haven't explained myself very good, I will be
> happy to elaborate further.
>
> Curtis