Ken, I don't know about the automatics, but my 88 GL with manual shift requires
absolutely that the engine rpm be set with engine warm and idle stabilizer valve
disconnected. I can't tell you how many mechanics I've seen try to set the rpm
on the 2.1L without doing that.  It invariably results in the the RPM being out
of whack. I always had to set them straight.

Warm your engine, disconnect the valve, start the engine again and let  it idle
in Park or Neutral and see what happens.

John Rodgers
88 GL Driver

Ken Anderson wrote:

> I'm getting about 13 mpg combined city and country.  Automatic transmission,
> 199,000 km (120,000 miles), recently tuned up.
>
> I just noticed tonight that, when the VW is warm, it's idling at about 1600
> rpm.
>
> Suggestions for improving my mileage?  One mechanic is suggesting replacing
> the oxygen sensor.
>
> Thanks,
> -Ken
>
> Ken Anderson
> ==================================
> K. Anderson & Associates Ltd.
> 2664 Dunlevy St., Victoria, B.C., V8R 5Z2
> (250) 360-6609
> http://maintaindata.com
> mailto:ken.anderson@maintaindata.com