Squeaks, squeals, rattles, rumbles, and other sounds provide valuable clues about problems and maintenance needs. Here are some common noises and their definitions. Squeal – A shrill, sharp noise, usually related to engine speed. Click – A slight sharp noise, related to either engine speed or vehicle speed. Screech – A high-pitched, piercing metallic sound; usually occurs while the vehicle is in motion. Rumble – a low-pitched rhythmic sound. Ping – A high-pitched metallic tapping sound, related to engine speed. Heavy Knock – A rhythmic pounding sound.. Clunk – A random thumping sound. The more details you can provide us, the better chance of locating the problem quickly. Does the noise occur when the engine is cold or warm? Hot or cold outside, rainy or dry? Does the noise occur while driving or only when parked? These clues help the technician diagnose your problems faster, saving you time and money!