System description:

The Audi Inline 5 cyl. engines (all types) uses 2pin PWM solenoids,but the older ones (10valve) are much more restricted,so they flow less.I have a newer AAN engine but with the older IAC valve.Tough i think this wont alone cause any problem,i created another:).This valve has approx 20mm in and out connectors for air ,but unfortunately i had to reduce the hose from the IAC to Intake Manifold from diameter 20mm to diameter 8mm.

What i noticed during IAC tuning was that the valve dont have a smooth control range.There is of course a difference between 30 and 100%,but there are "blind" sections.This is explained maybe with the insane high freq i use (50) ( i tought it is real Hz),or maybe the resticted valve??

So first,i will set this to a reasonable 3..10 value,and start the whole tuning again.

Thanks for the instant support.