Originally Posted by dirtcurt

I checked the check ball and nothing out of the ordinary, spring was 26mm. I did notice lots of air coming out of the pump with no air going in, none. Where would this air be coming from? Blow by? Internal pump leak? It was mainly at high RPM. The bubbles moved very fast. I will search for bubbles in the return line. Turbo got re-sealed after this started. It looked good while it was apart. I did nothing to the wastegate. I was reading the thread by bonedoctor?? and the shutoff valve being blown closed by crankcase pressure, this seems like what mine is doing.