Guys we have the same problem with cam phaser on Raptor here in China.
It begins with start up rattle,had very annoying but rhythm noise when engine was idling.
Dealer didn't had any clue when 1st case was happened because Raptor was just introduced to China market and they didn't have any experiences with Gen 2 ecoboost engine.Took them long enough to told us"this is just a normal situation" until the 1st case's truck starts to showing engine misfiring,then they took the engine apart and found cracks on one of the timing wheel.They fixed it under warranty.
My truck haven't showing this problem yet but we already had at least 5 owners reported this issue in our owner's club.all trucks had no mods on engine.4 trucks build data were 10/17,one was 11/17 and it just happened yesterday,so still waiting for result.
This is the pic of damaged timing wheel,I also had vids but don't know how to upload it here.
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