Scoob_2000 thanks for that, sound like you know your stuff. When does the Purge control valve open or close then ?
So how about this one then.....what controls the fuel over-run shut-off when you lift off the accelerator at speed. I know on fords that there was an overrun shutoff valve that worked of an earth contact when the throttle was closed, the minimum fuel to keep the car running was pumped in.
This would only work at above 1,600rpm. So I assume that the Subaru may be the same as I can feel it working above 2,000rpm approx. I was just wondering as mine seems a bit to abrupt at times and it may a clue why I have an on Boost hesitation that both Power Engineering and Barratts Subaru are puzzled by.