Your Toyota's engine can develop problems for several reasons. The engine has the important task of keeping your car moving, and it is made up of many smaller parts. Those components can break or wear out over time, which causes the engine to strain and overheat as a result. If your car's engine is overheating, you might find that it starts smoking from the hood or has a burning odor. Whether you notice one or both problems, you'll want to get your Toyota checked out by an expert mechanic right away.