First, here is my other thread about the turbo wastegate noise. https:/
In that thread there is a lot of noise in the video. That noise is actually both turbos and a loose exhaust.
So when that issue was resolved they had replaced one of the turbos. I drove it around and heard a curious howl...took it back and they replaced the exhaust gasket and tightened the exhaust...that fixed that. Then on a dead cold start...first start of the day...I hear the vibrating wastegate and then it disappears at some point.
I found a thread on the internet which seems to best describe what is going on: https:/ www.bobistheoilguy.com/ forums/ ubbthreads.php/ topics/ 5361674 /
Its going back to the dealer. One of the turbos is new, but they didnt replace the other turbo. Its probably a good idea to replace or rebuild both turbos. If this problem happens to you out of warranty then there are rebuilt turbos and aftermarket pop-in turbos available. The other issue is finding a mechanic who is familiar with turbos and the Ecoboost engine. The dealership will charge you a grip of cash. I think its like at least 8 hours of labor.
I will update this thread as we go...but pretty much if one turbo is doing it the other turbo is sure to follow. www.ecoboostperformanceforum.com/ index.php?topic=8439.0