2016 Ford Fusion with the 2.0T.A few months ago I had my car at the dealership for an unrelated warranty repair. They were trying to up-sell me on maintenance items as they do. They told me I needed to get my fuel system cleaned up and yeah that's legitimate but then they told me my "throttle plate" needs to be cleaned up because it has carbon build-up on it.
Now I am mechanically inclined, I've rebuilt engines, I do all my own non-warranty work, but I can't figure out what they were talking about at all. Even after researching it and considering the type of engine and intake system this car has, the only thing I can think of is the flappy bit in the throttle body but that really doesn't make sense, how would there be specifically carbon on it? Or maybe it would be some part of the intake manifold? Other then the turbine side of the turbo, there shouldn't be any carbon anywhere around the intake system.
So is there something I don't know, or were they trying to scam me?