What Causes the Humming Sound in a Car Engine at Idle?
2 Answers
The causes of a humming sound in a car engine at idle are: 1. Excessive carbon buildup in the engine, throttle body, and spark plugs; 2. Dirty air filter; 3. Dirty or substandard engine oil; 4. Wear and damage due to lack of lubrication in the driveshaft's universal joint; 5. Damaged engine mounts; 6. Abnormal cylinder pressure. The solutions to address the humming sound in a car engine at idle are: 1. Clean carbon deposits from the engine, throttle body, and spark plugs; 2. Clean or replace the air filter; 3. Promptly replace with qualified engine oil; 4. Replace the driveshaft's universal joint; 5. Replace the engine mounts; 6. Adjust the cylinder pressure.
With years of experience in car repair, I've found that buzzing noises at idle are often related to engine mounts. Loose bolts can cause significant vibrations, leading to a constant humming sound. Worn-out belts or faulty tensioners can also produce similar symptoms, such as squeaking combined with a buzzing noise. Oil issues shouldn't be overlooked either—dirty or insufficient oil increases friction, causing noise. When inspecting, listen carefully near different parts of the front of the car to locate the source. A simple method is to use a screwdriver pressed against the engine to detect vibrations. Once you notice a buzzing sound, don't delay—small issues can turn into major problems. Take your car to a reputable repair shop promptly to ensure safety. Regular maintenance is key: change the oil periodically and check belt tension to prevent issues before they arise. A car is like a person—take good care of it, and it will last longer.
