Thanks for the quick replies guys, much appreciated. The video link provided is one of the items which originally identified the issue for me.
As far as I recall, the intake valve issue that Mercedes is dealing with is the same as the one with the ecoboost engine - valve fouling in a direct injected gasoline engine. I understand that Mercedes at least, and perhaps other makers, are attempting to cure the problem by blasting the backside of the valves with walnut shells, which can be done without removing the heads (I can just hear the conversation in the shop with the tech that does this with the intake valve open). No sign that Ford has tried this yet.
Interesting that the Sprinter engine is also having problems, we were once thinking of a sprinter van as the next rv, but no longer. Too many issues with the diesel, and too expensive both initially and from depreciation. Even the better half has come around, and she hates towing - couldn't back a trailer to save a life at this point. We may have to work on that...
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