"Why is a Timing Belt important"? This may seem like an obvious question to some, but not everyone. A "timing belt" is what it sounds like, a rubber belt that controls the timing of internal combustion engines. Although it looks like a little rubber band, it is very important. It ensures that the camshaft, which controls the valves, and the crankshaft, which controls the pistons, rotate together. In other words, it keeps the top part of the engine in sync with the bottom half. "Why should I replace the Timing Belt? Two reasons. One, the valves need to open and close at the right moment and incorrect timing can mean limited air intake into the engine, and the inability to burn fuel. Two, the pistons and valves fall out of sync and collide without a proper working timing belt. Since the engine valves are fragile, it can lead to a very costly repair. "When should the timing belt be repaired"? Check your vehicle's manual for your vehicle's specific. Usually it’s around every four years. There is no "warning light" to let you know your timing belt is failing. Don't let this become an even more expensive repair. Remember not all cars have timing belts.