# Buzzing: Vibration of a loose fascia, vent, knob or wiring connector rattling against ductwork usually causes this bee-like noise. Debris in the ductwork also causes buzzing. High-pitched buzzing from under the vehicle usually means the heat shield on the catalytic converter is loose.Quote taken from here
# Clicking: A metallic-sounding clicking noise that becomes more frequent as the throttle is applied may be caused by bent or loose fan blade hitting the radiator or protective shroud. This is especially true on older vehicles with metal fan blades.
# Clunking or thumping: A heavy, metallic sounding noise that usually happens as the vehicle is put into gear. On rear-wheel drive vehicles it can indicate a failing universal joint on the drive shaft. Also, check for loose items stored in the trunk.
# Grating or grinding: Metallic grating or grinding sounds occurring when the brakes are applied means worn brake pads or shoes. Good brakes are vital to vehicle safety. Get them repaired right away.
# Growling: On older vehicles, a growling sound coming from under the dash means a worn speedometer cable. In the engine, it can mean the crankshaft bearings are worn. Growling sounds may also be an indication of rear end problems.
# Hissing: If it sounds like air escaping, it probably is. Check the tires for a puncture or loose valve stem. Escaping steam from a blown radiator hose also hisses. When checking for steam, open the hood carefully. Steams burns can be nasty.
# Knocking: A metallic knocking sound like a hammer hitting a metal door could mean worn piston rod bearings, allowing the piston rod to knock against the inside of the engine, destroying it in minutes.
# Pinging: If the engine makes noises that sound like loose gravel in a tin can, you probably have pre-ignition, a condition caused by improper timing or by using the wrong octane fuel.
# Rattles: These can be caused by anything from a loose jack handle in the trunk to a broken or loose shock. Check for loose items before seeing the mechanic.
# Squeaks: Most squeaks are in the suspension system and are caused by a combination of road dirt and a lack of lubrication. Pressure wash the suspension and get a lube job. Spraying door seals with a Teflon lubricant will usually cure squeaking doors.
# Squealing or screeching: A loose drive belt can cause a high-pitched squeal under the hood. If the sound happens as the brakes are applied, the wear indicators are telling you the pads are worn.
# Tapping or ticking: A light metallic tapping or ticking sound may mean that the valves aren't getting proper lubrication or need adjustment.
# Whirring: A whirring, whirling sound may be an indication of pending automatic transmission trouble.
# Whistle: Caused by disturbed airflow around the vehicle, whistles can be difficult to pinpoint. Anything from a loose molding, antenna, mirror, roof rack or slightly open window can cause a whistle.
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