Look at this DB2 Diagram and tell me where the "screw" is!

[mankypro]

Well turned 'er back about 1/8th turns today. Definitely a much quieter idle, if a little more of the tack, tack, tack diesel sound. Whiter smoke coming from the exhaust at idle. And a MARKED reduction in the amount of black smoke I get when I goose the pedal - still get a bit before and after gear changes - pretty normal stuff.

Definitely seems to run better. I may go back in and turn it up like 1/32nd. Definitely will need to when the turbo goes on.

Running leaner won't hurt my engine will it?

 

[RKOCH]

Yep 5/32 and a 4mm are so close to the same size you can use both.