Date:         Tue, 10 Feb 2004 15:52:07 -0500
Reply-To:     Ken Lewis <kdlewis_wasting_time@ACCESS4LESS.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Ken Lewis <kdlewis_wasting_time@ACCESS4LESS.NET>
Subject:      Troubleshooting Digijet fuel injection system.
Content-Type: text/plain; charset="iso-8859-1"

    I put together a simple electrical device I thought someone out there
might like to also assemble and keep in their tool box. Our 85Gl had an
intermittent cutout which developed into a no-start condition.
    The first thing I did was check for spark and injector activity. I take
the distributor off for safety, turn on the ignition and turn the crank
pulley by hand. Every time the Hall effect fires(in the distrib) the
injectors should fire once and the fuel pump should kick twice(just like
when you first turn it on). You should get a spark too if you are checking,
otherwise I ground the coil wire.
     What I found was the injectors was firing erratically and sometimes
continously for each pulse. Not good because raw fuel was being dumped into
the cylinders while I was troubleshooting. The solution was to cut off the
connector from an old TEMPII sensor and wire it to a light bulb with ~ 4
ohms of resistance. Unplug all four injectors and connect this device. This
way I had a visual indication while T/S and no flooding.
    The problem turned out to be one of the power relays (I hope) in the
black box above the coil had worked itself halfway out providing
intermittent power to the ECU. The ECU thought it was being energized
repeatedly, giving the above symptoms.

Party on Garth
Ken Lewis
86 Transporter Crew Cab
60 356 T-5 Porsche
http://neksiwel.20m.com/
Vanagon tech, pixs, O2 monitor gadget