I had to adjust my AFM spring tension to a richer open loop mixture to get
my surging to stop. My spring is backed off about 15 notches. When I run in
closed loop my digitool shows the ecu is still correcting the mixture to
spec.

If you adjust the afm spring you may want to test drive it in a parking lot
or something. When I was experimenting and tightened the afm spring, the van
had no power just off of idle, which is not a good thing when you are in a
busy intersection!

Mark Ingalls

>From: Bob Whitby <rpwhitby@MINDSPRING.COM>
>Reply-To: Bob Whitby <rpwhitby@MINDSPRING.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: rotten idle surge -- a thought
>Date: Sat, 11 May 2002 17:54:30 -0700
>
>The PO of my 87 Westy burned out the AC compressor. Instead of replacing
>the unit she just cut the wires and belt. Could the cut wiring have an
>effect on the "surging" idle, seeing as there is supposedly a switch
>between the AC compressor and the idle stabilizer valve to increase to bump
>up the idle with the AC is on, similar to the full-lock switch for the
>power steering?
>
>By the way, Bentley shows no such switch for my '87. Does't show controls
>on the dash for the AC either.
>
>How would I check this? Ground the switch wire perhaps?
>
>Dear god let it be... I'm completely out of ideas otherwise and the thing
>is practically undrivable without disconnecting the 02 sensor. Then mileage
>goes to poop.
>Bob W.

_________________________________________________________________
Send and receive Hotmail on your mobile device: http://mobile.msn.com