I know there are lots of threads about Boost/Vacuum Control Valves on here however. I just need a second opinion on this before I spent yet more cash on my Vectra...
I have taken the valve off the car and stripped it down for a clean as advised by the How 2 and found these...
Am I right thinking that the cracks would cause the vacuum to be weak. Thus affecting the actuator on the turbo meaning that my wastegate never quite shuts?
Might explain my pesky 100bhp only problem :-/
All thoughts are appreciated!