Volks,

I too have been plagued by the fast idle syndrome.  I thought I should pass
along my recent experiences.

A couple months back when the problem started happening (engine warm or
cold), I took a quick look at things, pulled the idle control valve, cleaned
it and pow! it was fixed!  For a week.  It was perfect for a week! When I
fired it up to leave on a weekend camping trip it was instantly back to the
high idle and wouldn't let up.  So I pulled the connector on the valve and
dealt with warm up issues for the weekend.

Next two months I didn't look at it but did some research and planned an
approach.

Monday night I did the following:

Checked again for vacumm leaks - none found
Cleaned and replaced ground wires - no effect
Installed new Temp II sensor - no effect
Checked Throttle Position Switch - Not working, fixed it, no effect
Checked output of oxygen sensor - Right on the money at 5 volts
Replaced the Idle Control Valve with unit from my '87 - BINGO!

Purrs like a champ!

Decided to check the timing, found it at about 3 degrees BTDC so advanced it
to 5 and found idle too fast again but not as fast as before.  Reasoning
that the idle had increased due to the timing change I backed off the idle
screw which seemed to correct things but I'm not sure.  It was 1 AM so I had
to stop messing with it but I suspect that the idle control valve is once
again messing with me.

Questions:  How much of a change in idle RPM can I expect from a two degree
change in advance?  Any thoughts on what might be causing my throttle
control valves to fail after working initially?  I've got another one I
might try tonight.

Thanks again.

Jeff Warner
Galloway, OH
'87 GL Weekender "Van"
'86 Wolfsburg Westy Weekender "Barry"
CI 94 (including compressors!)