What Causes Noise in a Car Engine?

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Reasons for noise in a car engine: 1. The car has been parked for a long time; 2. The engine belt tension is insufficient; 3. The oil viscosity is too high; 4. There is a leak in the intake or exhaust pipe; 5. Poor-quality fuel is used; 6. The engine underguard screws are loose, and the engine cannot be fixed properly; 7. The engine does not get sufficient release, leading to carbon buildup; 8. The throttle valve is dirty. Solutions for noise in a car engine: 1. Adjust the tension of the engine belt; 2. Inspect and replace the intake or exhaust pipe if necessary; 3. Tighten or adjust the engine underguard screws; 4. Regularly maintain the car on schedule.