What Causes the Buzzing Sound When Accelerating the Car Engine?
2 Answers
Car engine buzzing sound when accelerating is caused by: 1. Excessive carbon deposits, including engine carbon buildup, throttle carbon buildup, spark plug carbon buildup, etc.; 2. Poor filtration, commonly due to a dirty air filter; 3. Low-purity gasoline forming carbon deposits inside the engine, such as 90-octane gasoline being less pure than 93-octane, leading to more carbon deposits; 4. Spark plug aging, engine issues, cylinder problems, or idle speed issues. An engine is a machine that converts other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc.
I've been driving for over ten years and have encountered this kind of humming noise quite a few times. The most common cause is an exhaust leak, especially in older cars where the gasket at the joint wears out and starts to hum when the RPM goes up. Another typical issue is a broken engine mount bushing—when it deteriorates, the engine vibrations directly transfer into the cabin, and the deeper you press the throttle, the stronger the vibrations. Belt problems can also be the culprit; if the alternator or AC belt is loose or worn, it’s prone to making such noises when accelerating. Don’t overlook the intake system either—a clogged or dirty air filter can amplify the engine’s suction noise. Lastly, a word of advice: when this kind of noise appears, it’s best not to delay. My neighbor ignored a similar humming sound last time, and it ended up costing him thousands to repair a broken engine mount.
