Hafei Lubao's idle speed is unstable, and sometimes the speed is extremely high. After cleaning the throttle and replacing the throttle sensor and idle motor, it still doesn't work. What's the problem

Hafei Lubao's idle speed is unstable, and sometimes the speed is extremely high. After cleaning the throttle and replacing the throttle sensor and idle motor, it still doesn't work. What's the problem? 1, the fan starts frequently, and the water temperature should be high. When the water temperature is high, the fan starts to see if the radiator is not radiating well, such as the dust is too thick. Water supply is insufficient.

2, the idle speed is high, if the parts are all right, see that the air conditioner is not turned off, and the idle speed will be 200~300 rpm higher when the air conditioner is turned on; If this is still the case, the pipeline behind the throttle body may be leaking, such as several pipelines connecting the intake manifold: brake booster, carbon canister and crankcase ventilation pipe.

3. There are two special cases. One is that the design defect leads to uneven cylinder, which makes ECU misjudge; The second is caused by self-study mistakes. This kind of situation is basically not considered, and it is generally not encountered.