My cavs developed a problem over the last couple of days. My dump valve has gone from making a short whoosh, to a whooosh followed by a long whistle. It doesn't sound right at all! The cars also begun to stall on occasions when letting off the throttle after hard acceleration.
I've watched the actuator as someone revs the car, and there is no movement at all. I suspect it may be that the wastegate is stuck closed, but i really don't know. Has anyone else had a problem like this, or can anyone suggest anything else?
As always, any advice would be much appreciated!