My tale begins with taking my Westfalia to the local VW place here in
Charlotte NC to have a coolant leak fixed.  While you're at it, I asked that
they look into the rough idle that had developed.  It still idled okay, but
was just rougher than before.

They did a compression check and found that one cylinder was 20 lbs lower
than the rest but said that that was probably not the cause and I suggested
the spend a little more time.  They 'discovered' that the air flow meter was
not working and that the rough idle was because I was running extremely
lean.

They recommended a new AFM($500) and 'upgraded wiring harness' ($150).  I
decided to live with the rough idle a little longer.  But later that day, I
discovered that I could get both 'needed parts' from the Bus Depot for $119
each.  I hadn't run out of money yet this month, so I ordered them both.
They arrived in the promised time.

There's not much to installing them.  But the idle didn't smooth out much.
There's the hex head adjustment on the AFM; I tried turning a couple of
turns in each direction, with no noticable effect.  My question is on this
adjustment: Should I have gone further?  Or do I need more sophisticated
measuring equipment like the dealer has to monitor things like CO level etc.
?

thanks in advance for sharing your experience in this area.
John Graham

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