Crankcase ventilation passages are cast integrally with the heads to eliminate the need for external valves and plumbing. Fuel is delivered by a high-pressure sequential fuel injection system. Air is metered by an electronic throttle control that needs no mechanical link between the accelerator pedal and the engine. Throttle operation is instead governed by the powertrain control module through an electric motor. Throttle response and the engine's reliability are improved while build complexity is reduced.
Spark timing is keyed by a reluctor ring attached at the rear of the crankshaft.
Improved water jacket design eliminates coolant flow restrictions. The radiator is wider and the transmission cooler has been relocated to provide additional cooling capacity. Major improvements in overall quietness were achieved by use of two accessory drive belts. One belt is dedicated to the air conditioning compressor now mounted on the lower right side of the engine, positioning that noise source farther from the passenger compartment. A molded beauty cover over the engine improves its appearance and reduces radiated noise.