this sound from the yutbo is norma. dont worry about it. as far as a turbo needing "claening"? thats bul sh-t. tubos dont carbon up. stop your worring,,its not good for your heart.

 

it is normal,,it the turbo staling when it looses the hi pressure exhaust adainst it. dont worr about it,,it does no harm.

 

Get this, I took it in, they couldn't find the "back pressure leak" we'll call it, so they started on the hot line to the engine tech's, the print out came back," Normal during cold weather". Geeeze everything abnormal is normal with a 6.4....I pinpointed it to the sleeve fitting over the turbo in front ot the fuel cooler, I think in extreme cold the seal is not there??? my .02....Now I have severe popping and cracking under my feet when I turn a corner...Didn't you guys say the cab comes off for engine work, hmmmm