What's the performance of dirty throttle?

If the throttle is dirty, then the obvious performance is that when the car refuels, it will feel that the throttle is stuck heavily and the speed will be slow. And when you step on the accelerator at idle speed, the speed will rise slowly and the reaction will be slow. Release the throttle and the speed will drop immediately.

It also has a direct impact on the accuracy and smoothness of engine intake. The most obvious problem is that it may cause idling jitter or even flameout, and the fuel valve speed is not smooth.

Causes of dirty throttle

The engine is sealed by piston ring and engine oil in the process of combustion and work. Due to the high temperature and pressure in the combustion chamber, this seal will not be very tight. More or less, some burnt waste gas (water, carbon monoxide, carbon dioxide, carbide) will enter the crankcase. In order to reduce the crankcase pressure and prevent the oil from being polluted, it is necessary to forcibly discharge these exhaust gases through the one-way PCV valve, which is the forced ventilation process of the crankshaft.

At high temperature, some oil vapor will also be discharged with this process. In order to recover this part of engine oil, the exhaust gas will enter the oil-gas separator for oil-gas separation. However, due to the design of oil-gas separator and other factors, it is impossible to completely separate all oil and gas. Generally, some oil vapor will be connected to the intake manifold through the exhaust pipe.

When hot oil vapor meets cold air, or when the car stalls, some oil vapor will condense on the back of the throttle, and some gasoline sprayed into the intake manifold will also condense on the back of the throttle with the stall, which will lead to dirty throttle over time.