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>From: "Gregory M. Merritt" <gregm@engin.umich.edu>
>On Thu, 16 Jan 1997, Toby Erkson wrote:
>> How does pumping the pedal, with only the fuel pump running, purge the fuel
>> lines of air? I know running the fuel pump will pressurize the system, so
Right, I should have explained this better: My switch is only active with
the ignition on, so while I don't have to run the starter, I do have the FI
energized. If you listen at the engine with the key on (engine off) while
you move the throttle you can hear the injectors firing as the extra
throttle valve contacts in the throttle valve switch make contact. It is
also true that this only works in the 70-3 cars since 68-9 didn't have the
extra throttle valve contacts.
> There are a number of electrical contacts in that switch (is it
>twenty?); each one you pass through as you push the pedal down causes the
>injectors to open. This device (the throttle position switch) is the
>analog of a carb's accelerator pump.
Sorry, don't have the number of contacts memorized ;-) , but that is the
right idea. I THINK this only triggers one pair of injectors (depending on
the position of the trigger points in the bottom of the distributor), but
that has been enough to get me started.
I would also like to re-emphasize that most type IIIs don't seem to need
this treatment; they just start right up. I will be one happy fella the day
I finally figure out the REAL reason THIS car has been such a problem.
> (Please correct, Jim-meister. You feelin' the need for a D-Jet
>FAQ yet??? :)
Been working on it. Up to about 30 pages so far; I figure that's about half
done. Sorry, but I think it's outgrown the FAQ stage; I was thinking more
of selling copies as a supplemental manual to the Bentley on D-Jetronix.
Jim
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Melissa Kepner Jim Adney
jadney@vwtype3.org jadney@vwtype3.org
Laura Kepner-Adney
Madison, Wisconsin
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