HI,

I had the same problem with my 85.  I found that if I loosened the AFM
tension spring about 10 notches my van no longer surges at idle. I still
have not figured out why this would cause/not cause the surging at idle.

I monitor my closed loop 02, and my computer is still able to adjust  the
fuel properly, even though my loosening the spring richened up the open loop
fuel/air mix.

Be careful if you adjust the spring tension. I found if I tightened mine it
would hesitate 'just off of idle' when I was trying to drive off from a
stop. Not a good thing at a busy intersection. So test your adjustments in a
safe parking lot etc.......

Mark Ingalls
85 GL

>From: Ignace Speybrouck <ignace@SYMPATICO.CA>
>Reply-To: Ignace Speybrouck <ignace@SYMPATICO.CA>
>To: vanagon@GERRY.VANAGON.COM
>Subject: 1985 Digijet Surging at idle (AFM?)
>Date: Sat, 9 Feb 2002 21:32:01 -0500
>
>Hi,
>
>The van has been surging for a certain time now.  I checked for vaccuum
>leaks and found that the gasket between the throttle body and the intake
>plenum was leaking a bit, also the hose connecting the AFM to the throttle
>body was leaking.  Both were replaced today.  BTW the van has the new
>little
>Volkwagen plugin for the AFM.
>
>Hum...
>
>Still surging.
>
>I dismantled the AFM from the van, brough it inside (it's freezing outside
>and my garage isn't heated!).  Openned it to look at the mysterious
>rheostat
>I've been reading a lot about on the list.  Cleaned it and took some
>resistance measurments.
>
>Now the questions :
>
>1. Can the AFM induce surging ?
>
>2. Is it correct that the ohm reading I have through the range isn't linear
>at all ?
>
>3. How can I tell the AFM is OK without a hint of a doubt ?
>
>Thanks in advance for the input, the Vanagon electronic engine managment is
>beginning to get some lousy words out of my own mouth...
>
>
>Ignace
>
>
>1985 Vanagon GL
>1967 Volvo 144S
>1989 Mazda B2200 (lousy jap crap to haul construction materials for my old
>house, with NO MAINTENANCE electronic engine managment system...

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