When your car is running smoothly everything is okay, but how do you know when there is something wrong with your car? Each noise your car makes will tell you what’s wrong, and from there it is easy to find the solution.
You hear a high-pitched squeal that stops when you shut off your engine: Readjust or replace the belt. These belts should have about half an inch of play and shouldn’t be frayed, cracked, or glazed on the underside.
You hear a continuous high-pitched sound that may continue after the engines shut off: Check the radiator pressure cap. The rubber gasket may be worn.
Something ticks rhythmically while your engine idles: Shut off the engine, wait ten minutes for the engine to cool and the oil to settle, and then check the oil level. If you have enough oil, have a mechanic check the valve adjustment.
If you hear a loud tapping or knocking sound in your engine, pull to the side of the road and call for road service. The source may be a loose rocker arm or carbon buildup inside the engine, but if it’s a loose bearing or a faulty piston, it can destroy the engine.
Mild knocking or “pinging” may be the result of using fuel with the wrong octane rating.
You hear the engine running after you turn off the ignition: Your engine is dieseling. This condition only happens to cars with carburetors. It is usually caused by an idle speed that’s set too high or excessive carbon in the combustion chamber.