What Causes the Engine to Make Loud Noises When Accelerating?
2 Answers
The sound of the engine is directly related to its RPM—the higher the RPM, the louder the sound. When you press the accelerator, the engine's RPM increases, and so does the noise. Here are the specific details: 1. If you notice that acceleration is sluggish, power is lacking, and the engine makes a hysterical noise, this is most likely to occur when the engine is hot or cold or when it's low on oil. Possible causes include issues with the air filter, spark plugs, ignition wires, fuel, fuel filter, carburetor, or fuel pump. 2. If acceleration is normal while driving and ignition is functioning properly, but you observe that the engine RPM is too high while maintaining a constant speed without a corresponding increase in speed, check the coolant. Another possibility is incorrect ignition timing settings, which can also cause such symptoms. 3. If the engine produces a hissing sound, similar to steam or air escaping from the engine, and you notice a rapid loss of power afterward, it could be due to engine overheating, a blocked exhaust system, or a leaking or broken vacuum tube. 4. A whooshing sound from the engine during acceleration or deceleration may indicate low power steering fluid. 5. If the engine's damping components have aged, their shock-absorbing effectiveness decreases, leading to increased vibration and noise felt by passengers. 6. Inspect the vehicle's sealing strips. If replacing them doesn't make much difference, consider enhancing the overall sound insulation system of the car.
Last time I encountered a loud throttle sound, I found it was caused by an exhaust pipe joint leak. The metal friction noise was particularly noticeable, especially when accelerating uphill—it sounded just like a tractor. Later, an inspection revealed that the gasket had aged, and replacing it fixed the issue. Actually, worn engine mounts can also increase vibrations, creating a buzzing sensation similar to a phone vibrating. Oil-related issues are also common—using the wrong viscosity or going too long without an oil change can cause the engine to grind dry, making the noise louder. Now that it’s hot, I also made sure to check the AC compressor, as an overly tight belt can lead to abnormal engine noises. I recommend regularly inspecting chassis components—addressing these minor issues early can save you a lot of money.
