Any luck with the vacuum leak check I would be interested to see where you are loosing pressure.
Originally Posted by 540alex
I also had to replace the big o-ring at the TB. Used the same method as you and found it bubbling there. But the boost problem was not resolved after I fixed this and a couple other leaks. Finished my smoke machine today, will see if I can find more leaks.
Did you do leak test directly into the throttle body to eliminate the SC system as culprit? Did you tune the BOV? Could that be bypassing early?
Dang torx bolts snapped off on me when I went to remove front plate last night I had to drill and extract 2 of them to get the cover off. And one the torx bit snapped off in the bolt! Not happy about that will be replacing all with a more standard bolt tonight.
Working on autos is always like opening up a can of worms.
2001 540i - Orient Blue
M5 bumpers, wheels, mirrors
S/C, water/air IC
A1 Headers, Random Technology Cats, Eissenmann Exhaust
3.15 diff, evosport power pullies
Koni Sports, Eibach Springs/Sway Bars