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From: friedell@harvard.ARPA (Mark Friedell)
Newsgroups: net.auto.tech
Subject: diagnostic problems with VW fuel injection
Message-ID: <476@harvard.ARPA>
Date: Tue, 5-Nov-85 00:22:26 EST
Article-I.D.: harvard.476
Posted: Tue Nov  5 00:22:26 1985
Date-Received: Thu, 7-Nov-85 06:22:08 EST
Distribution: net
Organization: Aiken Computation Laboratory, Harvard
Lines: 16

I'm trying to debug the fuel injection on my '78 Rabbit and I've discovered
that I need about $10,000 in diagnostic equipment to do it.  In particular,
I'd like to get a reading of the control pressure between the control-pressure
regulator and the fule distributor.  The shop manual claims that this is
a piece of cake -- just connect your special VW CIS control-pressure guage.
And of course... to adjust the fuel mixture... just connect your home
exhaust-gas analyzer.

It seems that a control-pressure guage and an exhaust-gas analyzer are need
to test just about any part of the fuel injection.  Does anyone know how
to rig a home-brew version of either of these essential diagnostic tools?

P.S.
My problem seems to be a bad control-pressure regulator; when cold, the
car starts and runs fine, but when it warms up the control pressure seems
to drop more than it should causing hard starting and a feeble idle.