Date: Mon, 8 Jan 2007 13:34:36 -0800
Reply-To: jon <jon@KENNEKE.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: jon <jon@KENNEKE.COM>
Subject: Re: Idle Stabilizer Control Unit Reverse Engineering
In-Reply-To: <45A2B614.2020503@charter.net>
Content-Type: TEXT/PLAIN; charset=US-ASCII
John,
Thanks for the encouragement. I'll let folks know what my plans are:
1) Figure out a good replacement (or permanent repair/upgrade) for the
AFM. I have made some real good progress on this, and will announce some
fun stuff soon.
2) Come up with some alternative for the idle controller. The valve will
still be needed, though.
3) Try to solve whatever other persistant problems the FI has.
Now, if someone else could come up with head gaskets that won't leak,
we'll be set. ;)
Jon
On Mon, 8 Jan 2007, John Rodgers wrote:
> Jon,
>
> I have been following this thread for a bit and it is exciting to
> consider the possibilites. If you are able to pull this off, every
> Vanagon owner everywhere is going to owe you a big one. Aging electrics
> and electronics often kill older vehicles, and this particular item is
> especially egregious in that department. I have two vans with stock
> 2.1L WBX engines, and the Idle Control doesn't work on either one of
> them. They run so sweet when they work, and the mileage is a bit better
> as well.
>
> I offer my encouragement.
>
> Keep up the good work.
>
> Regards,
>
> John Rodgers
> 88 GL Driver x2
>
> jon wrote:
> > I recently received an ISV control unit (1986 and later) for disassembly
> > (among other things). Thank you Mike!!! This research confirms several
> > hunches that I had.
> >
> > The control unit consists of 16 op-amps (4 LM2902 quad chips), a 4 Amp PNP
> > power transistor for driving the idle stabilizer valve. I would bet
> > that this transistor is what fails when a control unit goes bad. This
> > part, a BD438, is readily available. So, I think repair would be possible
> > in most cases.
> >
> > My other bet is that if an IS valve shorts, it will blow the transistor.
> >
> > How many folks out there have a *bad* IS control unit? I'd love one to
> > verify if it's the transistor that went south.
> >
> > The unit is much easier to open the a 1.9L IS control unit (which
> > requires cutting). There are 6 clips molded into the case. Pry these away
> > from the connector bulkhead, and pull the whole thing out of the case.
> >
> > Pics of the unit are here:
> >
> > http://www.kenneke.com/vwfi
> >
> > I am going to be having some exciting news about all this FI stuff soon.
> > Stay tuned!
> >
> > Jon
> >
> >
> >
>
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