How to detect the quality of electronic throttle

Detection method of engine electronic throttle: 1. First, check whether the idle speed of the engine is stable; 2. Then put the car in neutral, turn the accelerator pedal to about 4000 rpm, and then release it to see if the accelerator is back to normal smoothly; 3. Finally, check whether there is any fault code, and clean the throttle valve, fuel injector and intake branch pipe after driving for 40,000 kilometers. If it is found that the engine idle speed is unstable, the high idle speed drops discontinuously, and it is difficult to start the engine, especially the cold start, then the problem can be solved by detecting the electronic throttle according to the above method.