What does it mean to have a timing belt replaced and how much does it cost to have one replaced on a 98 Grand Am?
The timing belt runs from the crankshaft to the cam, which
controls the valvetrain. The belt must be replaced at regular
intervals,(As outlined in your owner's manual), before it breaks.
Some engines are called Interferance Engines. If a belt breaks on
one of these engines, serious damage to the valves & or pistons
will occur. The cost varies with the vehicle.