Q: Knocking sound in the engine

A knocking sound in the engine generally means that the bearings in the engine are worn. When the bearings are worn, this allows the parts of the engine to have excess movement, causing the knocking noise. I would ask for help from one of the mechanics at YourMechanic to诊断是什么引起引擎中的敲击声，因此他们可以建议维修。