How to properly set the IP

[R.O.R-2.0]

Will it hang if you drop the idle that far and give a touch more fuel screw as well?

never tried turning my idle down that far with the screw wound in that far. i hate low idles on diesels, makes the dash wanna jump out of my car..

[rabbitman]

I've never seen a factory pump with the collar NOT against the nut, the one you bought was not even factory 'stock' so how is that even relevant? I've seen a lot of pumps but I could be wrong...

Well yeah, on my rabbit when I turned the screw in a turn or two but still not to the collar it would blow huge black clouds and barely idle low enough.

My golf on the other hand does have the collar against the nut and makes very little smoke, but also very little power. I've only got to look at about two other diesels around here and their collars weren't against the nut either. Most around here (that I've seen, they're very rare here) have probably been tampered with/rebuilt at some point