There is abnormal noise when the running-in period of BMW x6 is accelerated after overhaul.

What you want to ask is what happened to the abnormal acceleration of the running-in period after the overhaul of BMW x6? Too much carbon deposit in throttle, piston knocking and bearing aging.

1, too much carbon deposit in the throttle will affect the engine idle speed and air intake, making the engine idle speed jitter.

2. Piston knocking on the cylinder refers to the abnormal sound produced by side slapping on the cylinder wall. When the direction of axial force generated at the top of the piston changes from compression stroke to working with the piston, piston knocking will occur.

3. Bearing aging will lead to wheel jitter when the car is running, and abnormal noise will appear when the vehicle jitter is aggravated.