What Causes Internal Engine Noise?

1 Answers
DelLucas
07/30/25 5:48am
Reasons for internal engine noise: It could be due to loose screws on the engine underguard or loose plastic parts in the engine compartment, which can be fixed by tightening; or it might be caused by aging engine mounts, which support the engine and can only be replaced in such cases. Under normal conditions, when the engine is idling, only a uniform and slight exhaust sound should be audible. Engine noises can be categorized by location into main engine noise and accessory noise. If the noise disappears after loosening the fan belt, it indicates the noise is related to the water pump, generator, or their rotating components. If the noise stops after loosening the air compressor belt, then the noise is from the air compressor or its related components. If the noise persists after loosening all drive belts, the issue is likely with the main engine.
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