I've seen the topic of AFM spring adjustment discussed on this list for
years now and I still don't understand how spring tension can affect the
mixture in a closed-loop system. The O2 sensor (in conjunction with the ECU)
ultimately determines the mixture based on the amount of O2 in the exhaust,
right? So what does changing the AFM spring tension really do?

Mark McCulley
Seattle WA

----Original Message Follows----
From: Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
Reply-To: Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
To: vanagon@GERRY.VANAGON.COM
Subject: AFC Spring Adjustment
Date: Fri, 23 Mar 2001 09:23:25 -0500

Last night I'm looking at my old (spare) AFC and trying to figure out how
to adjust the spring before opening up  the new one this is in my '85
Westy.  I want to lean it a few notches.  It looks like there is a clip
(looks like  paper clip size wire) that is screwed down and retaining the
large black gear.  I want to turn this gear clockwise?  If I remove the
clip, how does this gear turn?  I wasn't able to get the screw loose that
holds the clip down.  Does the gear lift and turn or what?  Is clockwise
leaner for sure?  I only want to go 3 or 4 notches and try it with my
voltemeter on the O2 sensor output.
                                                    Jay

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