2001 Saab 9-3 Owner's Manual - Page 194

194 Car care Engine families Saab cars imported into the United States and Canada meet all applicable emission control standards. The engine family and appropriate tune-up specifications are identified on a label affixed to the left front inner fender. These engine families meet applicable EPA Federal Standards, California State Standards and Canadian Federal Standards and are equipped with the following systems Sequential multiport fuel injection system. Three way catalytic converter. Crankcase emissions control system. Evaporative emission system. Engine The engine is a transverse four-cylinder in-line engine with twin overhead camshafts and 16 valves. The engine is equipped with two balance shafts that reduce engine vibration to a minmimum. The balance shafts are chain-driven and rotate at twice the speed of the crankshaft. They produce forces and torques that are opposed to those generated by the pistons and connecting rods. The effect occurs twice in each revolution of the engine, counteracting the vibration from its moving parts, and at the same time reducing unwanted engine noise. The gearbox, located on the right (viewed from the front), is integrated with the engine. Emission control systems The systems for controlling emissions to the atmosphere require regular checking and adjustment at the intervals specified in the service program. In addition to meeting the exhaust emission regulations and thereby helping to keep the environment clean, a correctly tuned engine will also give maximum fuel economy.