M54 intake noise, sounds like it's got bronchitis!
What could this be?
It seems to be common, or perhaps even normal ? There's plenty of videos showing it on youtube.
I have replaced both intake hoses (hose from MAF, and lower elbow to TB).
The DISA is OK, and I also RTV'd it since the O-ring looks dead.
But basically it sounds like a person who's nearly dying in hospital after smoking 60 a day all their life.
Is it the design of the ICV ?
My last straight-six was a 2JZ-GTE in Supra, and you could barely tell it was running at idle.
The noise is quite similar to that of a worn out tensioner pulley, if that helps.