Date: Fri, 20 Dec 2002 19:26:51 +0100
Reply-To: Robert Steven Fish <fish@SALZBURG.CO.AT>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Robert Steven Fish <fish@SALZBURG.CO.AT>
Subject: Re: idle stablizer/its only another part (Good Info Here!)
Content-Type: text/plain; charset="iso-8859-1"
It's only a part???
A part that costs like 200 bucks new.
My pal in Austria who is rather knowledgeable in these matters explained it
so:
Around June of 1988 the Idle Stabilizer Control Unit was upgraded. The old
part numbers are:
251 907 353 A for DJ motor code
251 907 353 B for MV/SS/SR motor codes
After mid 1988 the newer ones had the following codes:
251 907 353 C for DJ motor code
251 907 353 D for MV/SS/SR motor codes
The newer version has apparently a feature whereby when you take your foot
off the gas (when shifting etc) the engine revolutions do NOT drop instantly
to the established idle RPM. Instead it sinks slowly, and pauses at 1100 RPM
for a few seconds before returning to idle RPMs.
The newer part also compensates for increased loads (A/C, extreme steers
with power steering, automatic transmission, etc.) differently by adjusting
the idle RPM to 1100 under load (instead of maintaining the established idle
under load as the old unit did).
He also says that you can test both idle stabilizer systems by simply
starting the engine. If the idle stabilizer system is working, the idle
should rise to 1500 RPM (the newer control unit holds it at 1500 a second
or so longer) and then the idle should slowly sink, settling in to the
established idle speed.
The old units also have a voltage regulator is designed weaker, and due to
carbonization over time, will not withstand the 430 +/- 20 mA and will burn
out.
Another test you can perform is to bridge the power steering contacts in the
pressure switch, and you should notice an increase in RPM of approx. 200
RPM.
Thank you to Harold H. for this great info!!
There is more (and it gets way too technical for me) to read at the address
below about the entire digifant system:
http://insel.heim.at/madeira/341126/FAQ_Ruckeln_mypage.html
Unfortunately it is in German.
(If I am lucky I may be able to get a hold of the schmatic for it, and then
we can all rebuild ours!!)
Enjoy!
RSF
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Robert S. Fish
Salzburg, Austria
1987 Wolfsburg Vanagon 2.1 GL Weekender
1987 Golf Cabriolet
1991 Golf
