I was thinking, my mysterious 1.3 bar bog when cold has come back. I was wondering if the valve is dirty and stuck, what are the symptoms? Do they resemble the bog I was talking about? One thing:when I punch the throttle, it feels almost like something letting go and then boost goes under way. It does feel like it sticks, though when it's cold. When it's hot, no problem. Steve '84 5ksT 1.8 bar