In my experience with my '84, surging at idle has been caused by incorrecct
idle screw/mixture screw settings.  Unfortunately, I do not have a CO meter,
but I've been tweeking the mixture screw along with the idle screw every
couple tanks of fuel.

In my case, the engine surging has always been associated with too lean of a
mixture, along with too high of an idle setting.

I've pinned down my mixture/idle setting- I no longer have any hessitation
or surging. And I'm honing in on around 20 mpg. Last tank was 18, this tank
should be upwards of 20+.

Brad

Bradley Flubacher
State College, PA
'81 diesel rabbit
'82 diesel westy
'82 diesel van
'84 GL wasserboxer

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM]On Behalf
Of Ignace Speybrouck
Sent: Saturday, February 09, 2002 9:32 PM
To: vanagon@GERRY.VANAGON.COM
Subject: 1985 Digijet Surging at idle (AFM?)

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...