What are the phenomena of throttle leakage?

The method for judging the air leakage of throttle valve is as follows: 1. When the engine is working, if the valve leaks, it means that the compression force of the cylinder is insufficient, the combustion is poor, and the exhaust regularly emits black smoke or white smoke, while the fuel consumption increases and the power decreases; 2. If the intake manifold is overheated at the same time, the central intake pipe has air leakage sound, and even the air filter has backflow and gas channeling, indicating that the valve is seriously leaking. Throttle is a controllable valve that controls air to enter the engine. There are two kinds of traditional cable throttle and electronic throttle. After the gas enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be burned to do work. Known as the throat of an automobile engine, it is connected with the air filter and the engine block.