I'm trouble-shooting an erratic idle problem with a cold engine.  The
archives and Bentley trail have led to the Aux Air Flow Valve.  I got the
old valve out last night (a tough job!).  Two questions:

        1.      Is there a bench test for this component?   I'm not certain
the old one is bad.
        2.      Has anyone had success cleaning and re-installing this part
vs. a complete replacement?.  My local VW dealer can get it but takes a
week.

If the aux valve proves not be the culprit, I'm next going to the AFM.  I
did the Bentley checks on this last night also.  With a meter on the
contacts, I moved the air gate.  The needle movement on my meter was less
than linearly proportional.  (the resitance would hold steady, then jump
with steady movment of the gate) The potentiometer surface may be worn.  Any
luck adjusting the wiper to a new sector on the pot?

Thanks,

Chip Beckham
85 GL Weekender