What Causes Engine Abnormal Noise After Releasing the Throttle?

1 Answers
VanDaniella
07/30/25 12:48am
Possible causes of engine abnormal noise after releasing the throttle: aging or loosening of engine mounts, engine misfire noise, piston slap noise, etc. Aging or loosening of engine mounts: When these engine mounts age or become loose, the engine will vibrate, resulting in abnormal noise; Engine misfire noise: The exhaust gas flow from the vehicle will show obvious intermittency, accompanied by severe shaking of the exhaust pipe, and the abnormal noise from the engine can be clearly heard; Piston slap noise: Due to poor lubrication conditions and excessive wear of pistons and cylinder walls, the clearance tolerance between pistons and cylinder walls exceeds the normal range. During engine operation, the piston skirt impacts the cylinder wall, producing abnormal noise.
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