What happened to the engine ring of BMW n20?

There are several reasons for abnormal noise of BMW n20 engine: 1, and the engine has serious carbon deposit: the most common reason for abnormal noise of engine is that the throttle is too dirty or the fuel injector has too much carbon deposit. Solution: Clean the oil circuit, check whether there is carbon deposit in the idle motor and clean it. 2, the ignition system problem: the ignition system is not easy to use, and the spark plug is not easy to use, which will also lead to this phenomenon. Solution: Check whether there is too much carbon deposit in the spark plug and replace the spark plug. 3. Unstable oil pressure: Abnormal oil supply pressure of oil pump, incorrect intake pressure sensor value and poor operation will all cause abnormal engine noise. Solution: Check the oil pressure and replace parts if necessary.