In the descriptive sense, people speak of luck after events that they find to be fortunate or unfortunate, and maybe improbable. Therefore, cultural views of luck vary from perceiving luck as a matter of random chance to attributing to such explanations of faith or superstition.
Chirping can be due to misalignment of the drive belt, but could also be due to pulley misalignment, worn pulley bearings, worn belt ribs, contamination from oil, coolant, power steering fluid, brake cleaner, belt dressing, or other substances. Squealing is usually caused by slipping between the belt and the pulleys.
Resonators and mufflers: excessive rust, damage, or holes can cause excessive noise and rattles. Exhaust pipes, hangers, clamps, and brackets: excessive rust, broken bolts or worn parts can cause the parts to hang dangerously low, resulting in a hazard for the people driving behind you.