TPS was my first thought. I'd have to look at my Digifant pro manual,
but IIRC, there is an electrical connection between the TPS and ISV
module (in front of pass. side tail light). There's also input from
the AC compressor to the ISV module IIRC but I agree with the TPS
likely being the culprit.

And if I'm thinking of the same part you are Casey.....

I know that the ISV on my Jetta swap engine can be cleaned with
throttle body cleaner and the like. It appears to me that the 2.1 ISV
is a similar beast. Maybe it can be cleaned? Not it is the issue
though.

Neil.

On Fri, Jul 19, 2013 at 3:48 PM, Robert Clemmer <n51219@comcast.net> wrote:

> My 91 did the same thing.  Turned out to be the throttle position switch was
> out of adjustment and wasn't indicating closed throttle.

> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Zeitgeist
> Sent: Friday, July 19, 2013 5:06 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Idle Control Issues

> So, the problem for me is that the 2.1L WBX wants to idle at 2k with the AC
> on.  Doesn't do it with the AC switched off.  I usually just blip the
> throttle and it settles down again.....  Can I assume the idle air control valve is
> "sticking", or is this more likely an idle relay issue?  I know Audis have
> an idle control valve that can be taken apart and lubed up when they stick,
> but these appear to be factory sealed from prying eyes and hands.

--
Neil n

Blog: tubaneil.blogspot.ca

'88 Westy http://tinyurl.com/c8rlw6p

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG Gas inline-VR Engine Swap Group:

http://tinyurl.com/d7gd5ej