Jeff,
Idle problems like this are caused by the ECU compensating for
something else bad or out of adjustment. Start with checking the
timing, adjusting valves, checking for vacuum leaks. THese are
all basics that don't cost much. Then find another vanagon, and
swap one part at a time.
Eric

Jeff Hartman wrote:

> Hi, I have been struggling with an unstable idle. It is very cyclic
> and the
> cycles and frequency increase with an electric load (fans etc.) With
> the O2
> sensor and temp sensor replaced, and other tuneup adjustments made,
> the VW
> dealership claims I need a mass airflow sensor. This was determined
> without
> any computer diagnostics. In fact the dealer's service department says
> that
> their new computer testing equipment no longer can test our obsolete
> Vanagons.
>
> I don't have a lot of faith in them, so do you have any ideas of whether
> they are right and what I should test next? I made a cursory review of
> the
> archives over a couple of recent years, without finding this exact
> problem
> described.
> Thanks, Jeff Hartman
> Juneau, Alaska
> 86 2.1 Vanagon
>
> _________________________________________________________________
> Get rid of annoying pop-up ads with the new MSN Toolbar � FREE!
> http://toolbar.msn.com/go/onm00200414ave/direct/01/
>
>