>My 88 Wolfsburg GL just got the case of the high
>RPM's! When I put it into Neutral or Park, it shoots
>all the way up to 2200rpm, in drive it hovers around
>1200 RPM.  We tried to clean up the Throttle body,
>adjust the switch, adjust to idle, and clean the idle
>stabilizer and nothing works.  The funny thing is it
>doesn't even appear able to adjust the CO.  I need
>some ideas if you don't mind about what things to do,
>look for....etc.  If anyone has a step by step
>procedure, I'd really appreciate it.

My '88 Wolfie was doing this for a while. Here's what
happened; when the engine heated up & I was stopped at
the lights, the idle speed would creep up and up,
usually to about 1500 RPM but often over 2000. Engine
braking was minimal & the van started bucking when
cruising at 40-50MPH.

 - Checked for air leaks around the throttle switch
   and intake plenum. Nope!

 - Checked all vacuum hoses were not sucking air in.
   Temporarily disconnected the brake servo lines &
   plugged the ends. Nope!

 - Cleaned, then swapped out the AFM. Nope!

 - Unplugged the idle stabiliser valve while the engine
   was idling fast. Woohoo - it dropped like a stone
   & idled about 800 RPM.

 - Figured it was the idle solenoid. Replaced it with
   a second-hand one from German Parts Warehaus in
   Rancho Cordova, CA. Idle got slightly better, but was
   still bad.

 - Swapped out the replacement solenoid & traded in the
   new one for a new idle stabiliser unit (the guys at
   German Parts Warehaus were great!). Problem went away
   completely!!

The replacement controller cost $120. It is located behind
the right-hand rear light in a compartment where the intake
air hose goes. Undo three clips & remove the panel & hose.
The box is mounted on a 'holder' & can be slipped out ...

Pete C

--
Peter Cassidy,                   pcassidy@apple.com
Sr. Test Dev. Engineer             +353-21-284316
WW Operations
Apple, Cork, Ireland.