[T3] idle problems

[Seldom <seldomss@yahoo.com>]

The vehicle:
70 Fastback 85K original miles, AT, F/I, somewhat
neglected mechanically (shoulda seen the oil and the
deposits on the rocker assemblies, etc).  Engine seems
strong (compression 110 - 115 all the way around),
cosmetically very nice.  

The story:
I bought it about a week ago even though the F/I
needed work.  There were two obvious problems - it was
running SUPER RICH and the car would hunt at idle - ie
cycle between about 800 rpm and basically a stall
every few seconds.   It would generally recover,
although the warmer it got the more likely it was to
stall out completely.  

The status:
Replacing the voltage regulator made a huge difference
with the richness problem so now the car runs well
under load, but the hunting remains.  I've done a
standard tune up - valves, dwell, timing, checked the
advance, etc. I've also done a partial check of the
F/I.  I don't yet have a manual to go by so I've been
relying for the most part on this list's archives
(they've been a tremendous help!) and a technical
overview for the D-jet and L-jet I found on the type2
web site.  But, I could sure use some advice from
anyone who can offer up suggestions.

The details:
- Fuel pressure is at 30 PSI
- I've adjusted the throttle valve, and it seems to be
functioning properly 
- resistance for temperature sensor I & II seem to be
within specs, both when warm and cold
- auxiliary air regulator seems to be working OK
although there is a very slight vacuum, even when the
car is fully warmed up. 
- The idle adjustment screw has no apparent affect
(vacuum leak I thought!) but
- Hoses seem to be in OK shape - I'll replace them
next.  In any case, I haven't been able to find any
obvious vacuum leaks.


Well, I am very much a neophyte when it comes to Fuel
Injection but thanks to these on line resources, I've
been able to make a little headway.  Anyone have
suggestions what might be the cause or what to check
next?  I've got a long commute and plan on using this
car as my daily driver.  I'm so excited about cruising
'round in an aircooled VW again!

Thanks,
-Damian



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