I have an 83.5 1.9l digijet Vanagon that I am having a problem with the
idle.  First of all I never heard the van run.  It came here after the owner
had blown up the last motor.  I got a good used motor that was a low mileage
rebuild and put it in.  It runs excellent, no smoke, and the only issue I
have with it is that when it is in Park (it is an automatic) the idle will
go up and hold or go up and down (oscillating).  I have replaced all of the
vacuum lines on the engine, the idle control unit (it does the surging when
the ICU is bypassed), checked for vacuum leaks until I am sick of checking,
and I can't find the problem.  The throttle postion switch works and seems
to be adjusted properly.  The customer swears up and down that the van ran
perfectly smooth at idle before we put the new engine in (as I said I never
heard it run so I don't know for sure).  It has all new cap, rotor, plugs,
and wires.  I checked the vacuum advance and retard and they aren't leaking.
I checked the fuel pressure and it is within spec.  Does anyone have any
other ideas that I can look at?  My next check is valve adjustment.  I
haven't adjusted them since the engine was supposedly running excellent
before it was pulled (again I didn't hear it run myself, getting this from
the seller).  The van idles smoothly when it is in "Drive" or there is a
load on the engine like when I turn on the A/C.  But sitting idling in Park
with no load is when it acts goofy.  Any ideas or similar experience would
be appreciated.

Thanks,
Ken Wilford
John 3:16
http://www.vanagain.com
http://www.strictlyvwauctions.com
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Phone: (856)-327-4936
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