Feedback control system for marine propulsion engine

A control method for a marine propulsion system for propelling a hull, an internal combustion engine carried by said hull and comprised of a combustion chamber, an air and charge forming system for supplying a fuel air charge to said engine combustion chamber for combustion therein for driving a propulsion device carried by said hull for propelling said hull, an exhaust system for discharging combustion products from said combustion chamber to the atmosphere, a combustion sensor for sensing the combustion condition in said combustion chamber, and a hull condition sensor for sensing a hull condition that will affect combustion, said method comprising the steps of reading the output of the combustion condition sensor, adjusting at least one of the engine systems in response to the output of the combustion condition sensor to maintain the desired combustion condition, sensing the hull condition that may effect the combustion, and adjusting at least one of the engine systems in response to the sensed hull condition for compensating for variations in hull condition.