The idle speed sounds good, but when switching on the AC kills the engine, that definitely points to the Idle Stabilizer Valve. If it is buzzing or
you can feel the vibration, then you may have a problem with the Idle Stabilizer Control, which is the little electronic box behind the right rear
tail light.

Will be interesting to hear how this plays out.

John Rodgers
88 GL Driver

Vanagon man wrote:

> Volks,
>
> The saga continues.
>
> tested coolant tempII  sensor, and it is in line.
> replaced oxygen sensor..........same result
> when warmed up, it would hold idle about 850-900 rpm.
>
> I checked rubber boot from AFM to throttle body, it is fine(actually took it off)
> ;ooked for other vac leaks none present
>
> Switched on A/c car died.
>
> When i turn the idle adjustment screw on the throttle body NOTHING happens..whether i go all the way in OR all the way out....idle is the same.
>
> This is truly bizarre.......
>
> When key is first turned, i can hear the idle stabilizer valve kick in.  (Buzz)
>
> I am going to check (recheck) valve adjustment right now