What is the reason why there is oil in the accelerator of the car?

There is oil in the throttle of the car because the exhaust gas of the engine is recycled and discharged into the air intake. Automobile throttle is a controllable valve to control air to enter the engine. After the gas enters the air inlet, it will be mixed with gasoline to form a combustible mixture, which will be successfully formed after combustion. It is one of the important components of EFI automobile engine system. Throttle is divided into: 1, the traditional engine throttle, and its operating mechanism is connected with the accelerator pedal at one end and the throttle linkage plate at the other end through cables or pull rods; 2. Electronic throttle, which controls the throttle opening according to the energy required by the engine through the throttle position sensor, so as to adjust the air intake.