Possibly OT, ??s about a GM feedback Q-jet

[Len Sabatine]

    The No distinguishing factors idea is the best one if you're going to use
    a  4 pin module HEI  and a plain vanilla Qjet 4MV. The fuel - knock control
    of the original setup was never much good other than to occupy space in the
    trash. Basic HEI uses 4 pin module , Centrifigual and Vac Advance
    Either go back to 79-80 equipment or convert to 7747 TBI setup to get your
    truck to run right would be my advise. TBI is much better in any respect.
    Carburetors are really part of the past now. FWIW.
    Len

>Maybe "electronic spark control" is the wrong buzzword for this system.  I
>figred that if the spark was controlled electronically, then you wouldn't
>need a vacuum can and weights/springs!  The only distinguishing factor
>between  this dizzy and a plain-vanilla HEI is the 5-pin module and the
>extra wiring harness coming out the back.  If I have my way, there'll be
>NO distinguishing factors :)
>
>  On Fri, 9 Mar 2001, Programmer wrote:
>
> > Hmmm...with electronic spark control ? I know they used 7 and 5 pin modules
> > throughout
> > those years....right back to the early 80's.
> >
> > Lyndon.
> > ----- Original Message -----
> > From: Bob Valentine <bob at tecmark.com>
> > To: <gmecm at diy-efi.org>
> > Sent: Friday, March 09, 2001 3:58 PM
> > Subject: Re: Possibly OT, ??s about a GM feedback Q-jet
> >
> >
> > > It uses a 5 pin module, have one here on my desk....
> > >
> > > -> Bob Valentine
> > > -> bob at tecmark.com
> > >
> > > At 07:59 AM 3/9/2001 -0700, you wrote:
> > > >I thought that ESC system used a 7 pin module ? I don't think the 
> PCM (or
> > > >ESC computer) is doing
> > > >anything anyways...I believe you jumper "A and D" on the 4 wire from the
> > > >dissy to bypass the computer.
> > > >
> > > >Lyndon.
> > > >----- Original Message -----
> > > >From: <Chipsbyal at aol.com>
> > > >To: <gmecm at diy-efi.org>
> > > >Sent: Thursday, March 08, 2001 9:08 PM
> > > >Subject: Re: Possibly OT, ??s about a GM feedback Q-jet
> > > >
> > > >
> > > >> I'll try to help you here, it's been years since I've fiddled with
> > these.
> > > >First, you don't have a mixture control solenoid. That solenoid actuates
> > to
> > > >enlean the accelerator pump shot when the ecm so desires. It can be
> > > >disconnected with no problems, except a persistant hesitation may 
> finally
> > > >clear up. The distributor is part of a ESC system. It can be 
> converted to
> > > >non-esc by disconnecting the four wire connector and jumping two 
> wires on
> > > >the dist side of the connector. Now here my memory gets a little foggy.
> > If
> > > >you can tell me the colors of the wires and what position they are 
> in the
> > > >connector, I can tell you which two to connect. There is a green, black,
> > > >brown and the last one. The truck won't run with the connector
> > disconnected.
> > > >I used to get quite a few no starts with this system. The customer 
> always
> > > >opted for the wire fix over the ecu replacement.
> > > >> AL
> > >
> > >> 
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