So, I have been working on the m535 and took the valve cover off to check the banjo bolt and then put it back on. About a week later I tried to start the car, yesterday. Would not start....so I thought what have I done that would cause a major vac. leak....the valve cover????
So I tightened it down some more. There was one that was lose .
Got that done and car started right up .
I am going to replace all the rest of the vac. lines today!!!
jm