The engine did not start and had a burning smell coming out. The SUV was towed to a Ford dealer to find out the engine block has to be replace. The SUV has been well maintain through out the years of ownership. It has 84000.00 miles on it. After some research, my SUV is not the only one that this has happened. It seems FORD explorer with an ecoboost engine have this issue. 2017 Ford Explore with an EcoBoost engine-ENGINE LONG BLOCK AND RETESTING (VERIFIED CONCERN AND PERFORMED DIAGNOSIS, FOUND COOLANT BOTTLE EMPTY AND ENGINE TO NOT CRANK BUT WHEN TURNING KEY THE ENGINE ATTEMPTS TO CRANK BUT STOPS, HAND VERIFIED THAT CRANK SHAFT WAS LOCKED AND FOUND HYDRO-LOCKED ENGINE DUE TO COOLANT INTRUSION) Fail $11,690.90