Check that the crankcase vent hose is not rotton and has holes. It's a
short  hose right on top of the engine.

John Rodgers
88 GL Driver
BTDT

KD wrote:

>Hi,
>
>Check the Temp II wire connections for corrosion or breakage, especially
>near the connector. (actually check all the connections you can while you're
>in there. Especially ground straps. Same thing happened to me (panic time)
>Also make sure no vacuum leaks or  corrosion on wire connections and ground
>to the O2.
>
>Wish I could say I know these things cuz I'm so smart.....but I can't.
>Learned it all from the great people on this list.
>
>Cheers,
>Katy
>
>
>>Hello, I replace the idle control unit on my '88 Vanagon and the result is
>>that it runs fine for a while, then the idle will jump up to 2200rpm and
>>refuse to return. Even turing the ignition off then on makes no difference.  I
>>did clean out the idle valve when I replaced the electronics.  The o2 and temp
>>II sensors were replaced a year ago...................
>>
>>
>
>
>