What Causes a Sudden Increase in Engine Noise?
2 Answers
The reasons for a sudden increase in engine noise are: 1. Loose components: Some parts in the engine compartment, such as the valve cover or intake pipe, may become loose and collide with the compartment during driving, producing noise; 2. Oil issues: When new oil is replaced, the engine may not adapt to the oil's viscosity, potentially causing higher RPMs; 3. Carbon buildup: Over time, a significant amount of carbon deposits can accumulate, adhering to the friction components inside the engine and increasing friction. 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 a decade and have encountered several instances where the engine noise suddenly became louder, accumulating some experience along the way. The most common cause is an exhaust system leak, such as a loose exhaust pipe connection or a crack, which can make the sound louder. Another reason is insufficient or old engine oil, which reduces lubrication effectiveness, resulting in louder engine friction noise. A loose belt is also a common culprit, producing an annoying squealing sound. The last time my car's noise increased, I found that the air filter was clogged, causing poor air intake, and cleaning it quieted it down. Additionally, sensor failures, such as a faulty oxygen sensor, can also cause noise. I recommend not underestimating this issue and visiting a repair shop as soon as possible. Otherwise, a minor problem could escalate into engine damage, making repairs more expensive and troublesome. Regular maintenance of engine oil and filters can prevent many issues.
