Why is my 2015 Ford Focus ST3 blowing smoke with a burning plastic odour?

Ford’s EcoBoost engines have a bit of a track record with blown head gaskets thanks to the fundamental design of the crankcase where it meets the cylinder head. Given the relatively high turbo-boost pressure some of these engines use to produce their impressive performance, the head gasket can fail.

But it’s also fair to say that this engine design has also seen its share of overheating problems, blown turbochargers and coolant leaks (often into the cylinders). With that in mind, don’t bother guessing what the problem is, allow a mechanic to inspect the engine and give you a professional opinion based on facts.