[Diy_efi] Holley projection help needed

[Jeff Behrens]

The orange wire on mine is the supply wire that reads
4.8 volts with the engine off.  The signal from the
map sensor is 4.4 in the same condition.  I made a
voltage divider tonight and dropped the voltage down
to 2.5 on the suppply side and the truck actually ran.
 It really leaned things out.  The system is still
very unstable as it keeps changing state from idle to
decel and run.  If any body has any experience with
projection I could really use some advice.


Jeff
Automation specialist
--- Joe Lutz <joeelutz at hotmail.com> wrote:
> It sounds like maybe you have two of the three wires
> going to the map sensor 
> reversed or you have the wrong sensor.  Is it a one
> bar sensor?  On the 
> sensor one wire is 0V, another should be ~4.8ish V
> and the middle wire is 
> the wire returning the signal to the ecm.  It may be
> at ~2v with the sensor 
> pluged in.  Possible this is what they are talking
> about.
> 
> Joe
> 
> 
> >From: Jeff Behrens <jwg94 at yahoo.com>
> >Reply-To: List for general do-it-yourself EFI talk
> <diy_efi at diy-efi.org>
> >To: diy_efi at diy-efi.org
> >Subject: [Diy_efi] Holley projection help needed
> >Date: Mon, 2 Jun 2003 07:45:36 -0700 (PDT)
> >
> >I purchased a holley projection 4di system and am
> >having some issues with it.  My map sensor reading
> >with the key on ignition off is 192 kpa, the book
> says
> >it should be 101.  It also states the voltage to
> the
> >sensor should be 2 volts with the koio.  Mine reads
> >4.8 volts.  The other problem I am seeing is the
> >system is constantly changing states between idle,
> >run, and standby making the idle terrible.  Any
> help
> >would be appreciated.
> >
> >
> >Jeff
> >
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