May be.  My apologies for not mentioning - 2.1L digifant. The AC system is stock '85.  

I know the IS should maintain around 850.  It doesn't, but rather, it seems to overcompensate.  

Karl Wolz
Sent from my electronic umbilicus

On Oct 24, 2012, at 8:02 PM, neil n <musomuso@gmail.com> wrote:

> Isn't the IS system supposed to more or less keep the idle around 900
> RPM when the AC load hits it?
> 
> I don't have AC, but PS turned hard, idle moves a little but the
> system keeps it around 900 RPM.
> 
> I'd have to bust out my Digifant pro manual, but IIRC, isn't there a
> current check one can do?
> 
> Neil.
> 
> On Wed, Oct 24, 2012 at 7:05 PM, Karl Wolz <wolzphoto@q.com> wrote:
>> As my AC cycles off and on, my idle changes from 900 or so to around 1800rpm.  Seems to me the IS is trying a bit too hard.  Suggestions?
>> 
>> I have a spare, but pulling the tail light is a lot of work. ;-).
>> 
>> Karl Wolz
>> Sent from my electronic umbilicus
> 
> 
> 
> -- 
> Neil n
> 
> 65 kb image Myford Ready For Assembly  http://tinyurl.com/64sx4rp
> 
> '88 Slate Blue Westy to be named.
> 
> '81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/
> 
> Vanagon VAG Gas I4/VR Swap Google Group:
> 
> http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines