What are the causes of abnormal engine noise?

[DiAllison]

Causes of abnormal engine noise include: 1. Carbon buildup in the engine throttle; 2. Blocked exhaust system; 3. Faulty spark plugs; 4. Muffler issues; 5. Cooling system failure. An engine is a machine that converts other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, jet engines, and electric motors. Internal combustion engines typically convert chemical energy into mechanical energy. The term 'engine' can refer to both the power-generating device and the entire machine including the power unit. Common cylinder configurations for automobile engines are 3-cylinder, 4-cylinder, 6-cylinder, 8-cylinder, 10-cylinder, and 12-cylinder. If abnormal engine noise occurs during daily use, it is recommended to contact the local 4S dealership for timely inspection and repair.

[LeAubrey]

I've been driving for several years, and engine noise is really annoying. Common causes include loose or worn belts, especially in older cars that squeal when driven. Insufficient engine oil leading to poor lubrication can cause parts to rub and produce a ticking sound. Also, excessive valve clearance or worn timing chains can create rhythmic knocking noises. I remember one summer when the noise got worse in high temperatures, and it turned out to be a water pump issue. If these minor problems aren't addressed promptly, they could lead to engine failure. So, I recommend getting any unusual sounds checked by a professional shop—don't skimp on this. Regular maintenance like oil changes and belt inspections can prevent a lot of trouble, and a healthy engine makes driving much more reassuring.

[VonElla]

For ordinary people who frequently tinker with cars, abnormal engine noises can originate from multiple sources. For example, worn crankshaft or connecting rod bearings produce a buzzing sound; issues in the valve mechanism, such as incorrect valve clearance, result in a ticking noise; a loose or slipping belt system causes a squealing sound. Low engine oil is a common factor—poor lubrication leads to increased friction noise. I've also noticed hissing sounds caused by exhaust system leaks. These abnormal noises all indicate potential risks, such as severe bearing failure possibly leading to engine seizure. Therefore, at the first sign of noise, first check if the oil level is normal—change it immediately if the color has changed. If unsure, don’t delay—consult a reliable mechanic to diagnose with a stethoscope to ensure safety.

[DiVictoria]

Common causes of engine abnormal noises include squealing from belt wear, knocking from the valve train, or heavy noises due to crankshaft issues. Insufficient or degraded engine oil can exacerbate friction sounds. Damaged piston rings may also produce unusual noises. I've experienced louder noises during cold starts in winter, which diminish after warming up. Timely inspections can prevent minor issues from escalating. Regular maintenance checks on these components are recommended to ensure smooth engine operation.