Re: 165 ECM question, "single fire" vs "double fire"

[romans@starstream.net (Romans, Mark)]

Two connectors, one driver in the ecm.
Mark
----- Original Message -----
From: "Kevin Crain" <kevin@warpten.com>
To: <gmecm@diy-efi.org>
Sent: Thursday, May 04, 2000 5:35 PM
Subject: Re: 165 ECM question, "single fire" vs "double fire"


> I'm looking at the Helms manual to my '88 GTA harness, it shows circuit
467
> coming off one injector bank and terminating at ECM pin D15...also shows
> circuit 468 coming off the other injector bank and terminating at ECM pin
> D16.  This makes it look like two separate ground paths.
>
> However, the ECM diagram on the same page only shows one 'Injector
Control'
> with both circuits wired into it in parallel.
>
> If I'm interpreting this correctly, there are two ground paths but only
one
> driver pulsing both banks simultaneously.  It was my understanding that
the
> ECM fires the injectors twice per revolution, however.  Can't find
anything
> in the manual on this, tho.
>
> -Kevin Crain
>
> At 05:02 PM 5/4/00 -0700, you wrote:
> >>From looking at the wiring harness on my 87 Vet,  (86-89 F&Y bodies all
use
> >the 165 ecm) there is only one wire providing ground to the injectors
> >through the ecm, so only the single fire, batch mode is used.  All
injectors
> >fire once every engine revolution.  No it may have to do with synchronous
> >versus asynchronous pw.
> >Mark.
> >----- Original Message -----
> >From: "Rick Lindstedt" <rick@mafb.org>
> >To: "GM-ECM" <gmecm@diy-efi.org>
> >Sent: Thursday, May 04, 2000 1:36 PM
> >Subject: 165 ECM question, "single fire" vs "double fire"
> >
> >
> >> Can some please tell me the difference between double fire and single
fire
> >> on the injectors and why/how/when the ECM uses these variables??
> >>
> >> Thanks so much.....
> >>
> >> Rick
> >>
>
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