Steve,

My AFM tests similar to yours.  When looking closely (shine a strong light
at an angle), I noticed a hairline crack, right where the resistance jumps.
I have been driving like that for a while now, I'm surprised, because there
seem to be no problems, and the gas mileage is good too.  I ordered a new
AFM meter though,  just in case.

Alfred
85 Westy

----- Original Message -----
From: Steve Gough
To: vanagon@GERRY.VANAGON.COM
Sent: Saturday, May 12, 2001 1:25 PM
Subject: Re: AFM Testing?

Joe,

I'm sure I'm checking it right.  Behaves the same way both by checking at
pins 2-3 (center two)
and by touching the board.

Here are the values, in kohms, measured both at the pins and by putting a
probe on the carbon track where the wiper are contact would be (and closest
to the taps, because the carbon track obviously has its own
 resistance:  Here's what I get:

               pins 3-4    on carbon track

closed      500             500
1             1100           1100
2             1100           1500
3             1100           1500
4             1100           1800
5             1100           1200
6             1000           1100
7               950           1000
8               900            1000
9               800            1000
open          300             700

----- Original Message -----
From: Joe Romas
To: Steve Gough
Sent: Saturday, May 12, 2001 2:05 PM
Subject: Re: AFM Testing?

Steve,

Something dosen't sound right! It should keep rising in a steady line with
no dips or rises and keep going up untill it reaches the end. Are you
metering it at the pins or somewhere on the board?

Joe
----- Original Message -----
From: Steve Gough
To: Joe Romas
Sent: Saturday, May 12, 2001 2:56 PM
Subject: Re: AFM Testing?

Thanks, Joe.

What's wierd to me is that neither unit shows a steady increase or decrease
in resistance as the flap is opened.  More like a "hump", i.e. resistance
slowly
rises until about half open, and then falls again.  It's lowest at either
end of the
travel.  Make any sense?

Steve
----- Original Message -----
From: Joe Romas
To: Steve Gough
Sent: Saturday, May 12, 2001 12:59 PM
Subject: Re: AFM Testing?

Steve,

The one with the drop-outs is bad! The resistance should rise steadilly as
you move the arm from idel position. When the computer gets to the
"drop-outs" it sees it as a lot of air and adds more fuel and that's when
things go south as far as running go.

Joe

----- Original Message -----
From: Steve Gough
To: vanagon@GERRY.VANAGON.COM
Sent: Friday, May 11, 2001 4:06 PM
Subject: AFM Testing?

Dear List,

I'm trying to tell if I need a new air flow meter for my '86 Vanagon.

Can anybody enlighten me on how resistance should change
as the vane moves?  My manuals (even Probst) are vague.
I have two AFM's in hand.  Both show similar resistance changes
with movement, but one seems to have some drop-outs.

Couldn't locate anything in the archives.

thanks,

Steve