Before we can go any further with this project, we need those
measurements.  I'm not interested in investing time, materials, and money
into a project if it's based on assumptions and guesswork.  My Vanagon
can't be used because it doesn't have the Digifant injection system.

So, we need either:

Someone with an oscilloscope or a digital multimeter w/pwm functions who
has access to a Vanagon with Digifant FI that has a healthy ICU as well as
power steering and AC.  Bonus points if it's an automatic.

Or,

Someone in the Portland Metro area with a van that fits the above
description who would be willing to work with me for a couple of hours.  I
do have an oscilloscope and could take the measurements.

On Wed, Nov 20, 2013 at 1:23 PM, Brett Ne <brettn777@gmail.com> wrote:

>
>
>
>
>
>> Assuming a properly functioning engine and IS system, if one measured
>> current draw at the ISV, loads on and off, at idle, cruising speed and
>> WOT, could they get a really good idea of when the ISV is used? (valve
>> changes position). Maybe a graphing meter would be useful in this regard?
>
>
> Current draw or voltage measurements would be kinda okay.  They should be
> proportional to the duty cycle, but again, knowing the duty cycle tells you
> exactly what the control unit is doing and is much preferred over indirect
> measurements.
>
>
>
>> My guess is that at idle, no loads (PS, AC) the valve is
>> closed. Or.....
>>
>
> ...or partially open.  We can all guess until we're blue in the face, but
> if we want to create a re-engineered control unit that solidly replaces the
> old one, we have to establish the behaviors of the old one first
>
>
>>
>> Isn't the ICU basically taken out of the picture any time the throttle
>> is just off idle or at WOT?  (throttle enrichment switch activated or
>> not).
>>
>
> Maybe, maybe not.  Maybe the idle throttle opens fully under full throttle
> to help the engine breathe better.  I just don't know.
>
>
>>
>> Did you find the correct "Vanagon" Digifant pro training manual
>> online? If not, can send more images. There may be some useful in
>> there for your needs.
>>
>
> No, I haven't, though to be honest, I haven't been looking.  Typically
> training or repair manuals may give enough info to identify a faulty part
> but don't give all the details on how that part interacts with all the
> other parts of the system.
>
>
>
> --
> Brett in Portland, OR
> "Albert" '82 VanaFox I4 Riviera
>

--
Brett in Portland, OR
"Albert" '82 VanaFox I4 Riviera