What causes abnormal noise in BMW N13 engine?

[Damian]

The causes of hysterical noise in BMW N13 engine can be attributed to issues such as air filter, spark plugs, ignition wires, gasoline, fuel filter, carburetor, or fuel pump. Check if the air filter is dirty, if the spark plugs are worn out, if the ignition coil is damaged, or if the gasoline is contaminated. 1. When driving, acceleration may seem normal and ignition might appear fine, but when maintaining a constant speed, you may notice that the engine RPM is too high while the speed doesn't seem to increase. Try checking the coolant, oil pressure (whether too high or too low), inspect the oil pressure gauge, or there might be an issue with the ignition timing setting, which could also lead to such symptoms. 2. When accelerating, the engine produces a whirring sound, or it may also occur when decelerating. In short, the sound changes with RPM variations. If the power steering fluid is low, refill it. The generator bearing might be damaged. Problems with the power steering pump or water pump can also produce similar noises.