What could be the reason for a sudden slight popping sound from the engine?

[DelOmar]

Possible reasons for a sudden popping sound from the engine are as follows: Engine mount rubber aging or loosening: The engine mount rubber refers to the rubber blocks placed between the engine and the vehicle frame. Their purpose is to reduce vibrations and provide cushioning during engine operation, as well as to secure the engine in place. Once these rubber mounts age or loosen, the engine may start to shake, resulting in abnormal noises. Engine misfire noise: An engine misfire mainly refers to one or more cylinders not functioning properly. Common symptoms include: intermittent exhaust gas flow from the vehicle, noticeable shaking of the exhaust pipe, and a clear "popping" or thumping sound from the engine. This phenomenon is often closely related to ignition coil failure. "Piston slap" noise: Due to poor lubrication conditions, excessive wear of the piston and cylinder walls can cause the clearance between the piston and cylinder wall to exceed normal tolerance ranges. When the engine is running, the piston skirt impacts the cylinder wall, producing a clear "clanging" sound, which is usually more noticeable at idle or low speeds.