Date:         Fri, 21 Feb 2003 07:19:44 -0400
Reply-To:     Matt Sutton <msutts@EARTHLINK.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Matt Sutton <msutts@EARTHLINK.NET>
Subject:      Simple diagnostic/lifesaving tool?(electronics gurus?)
Content-type: text/plain; charset="US-ASCII"

Hi Folks,
    Well, the van("help losing idle" thread from this week) is in the shop.
Replacing the ISC/ISV hasn't done any good, some more parts are going in
today, including an FI temp sender.
     I woke up this morning with the Bentley resistance/temp curves in my
head for some reason. Has anyone ever tried substituting a manually variable
resistor for either of the FI Temp senders(air/ coolant)? What would be the
required specs for this potentiometer/rheostat?
    I'm imagining this could be useful in a few ways: Dialing in the the
correct resistance for the outside air temp or warm/cool engine you could at
least know exactly what the ECU was getting on those fronts, and be able to
pin down other aspects of the FI without the expense of swapping sensors.
Also, in a pinch these could be used in a driving situation, creating a kind
of tune-as-you-go situation(the outside air dialed in, the resistance
lowered as the coolant comes to operating temp) until you can get parts
changed.
    This seems like it should work. Though the ECU is reacting very quickly,
the variable resistors in the various FI temp senders react to changes very
slowly, well in the realm of manual adjustment.
    What do you all think?
                                        -Matt Sutton
                                        88GL(unwell)