How to Determine Engine Condition by Sound
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Methods for determining engine condition by sound: 1. During engine startup, if the idle sound is uniform without abnormal noises, the engine is good; if there's a screeching sound during startup, it's bad. 2. Gently press the accelerator to gradually increase engine speed - there should be no miscellaneous noises during this process. Some vehicle models may experience resonance at specific fixed RPMs, causing slight body vibration. If the resonance is very mild and doesn't cause discomfort, it should be considered normal, and the resonance sound will disappear after passing that RPM. 3. Quickly press the accelerator pedal - if the engine power increase sound is smooth without hesitation, it's good. Carefully distinguish between the engine sounds at different RPMs.