The BMW 3 Series throttle leaks loudly.

The following two situations are normal:

1, when the cold car starts, even if you step on the accelerator deeply, the car will slowly accelerate, and it will be fine after the hot car.

This is the protection mechanism of gearbox and engine, which is the case with many models. Because the lubricating oil has not fully lubricated all parts in the cold state, if the speed is increased sharply, the wear on the vehicle gearbox and engine will be more serious.

2. If the displacement of the car is small and the load is heavy, there will be a weak start. For example, I usually drive by myself most of the time. Suddenly one day the bus was full of five people. At first, you will obviously feel lack of motivation.

There are many reasons for vehicle failure, such as lax valve seal and insufficient cylinder pressure; Excessive carbon deposition at the air inlet; Spark plug carbon deposit or incorrect gap; Nozzle blockage, insufficient fuel injection and so on.

The most common is throttle carbon deposition. The accumulation of carbon deposits in the throttle will affect the intake air volume,