Vacumm
 

That is what I am saying, it was vacuum, but ...is there a protocol to determine that it was the shaft seal??? I discover it by chance

Which shaft seal are you talking about. Where on the engine?

On the front

is this shaft seal on the front in relation to a valvetronic problem causing the vibration? Mine started idling a bit rough and my mech said he's seen a rash of 5 people over last 2 months come in with exact same problem I'm finding with my x5. cel showa no exact problem, just "misfire" on cyl 6, 7 & 8.

hey I have 2005 4.4 x5 same problems. what shaft seal are you talking about , can some one please specify. and were there any other solution ?