Hafei, idle speed is always low or high. What is the most accurate question? Please answer it by an expert. Thank you.

1 fault analysis; High idle speed indicates that the EFI vehicle is caused by excessive air intake at idle speed. There may be one in this area. There is a gap in the throttle replica, and the idle motor is not working properly. Air leakage of intake manifold, air leakage of carbon canister solenoid valve, etc. 2 inspection method. (1) Block the throttle with the palm of your hand to see if the engine stops. If the engine is not turned off, it means that the intake manifold is leaking and the carbon canister solenoid valve is leaking. If the flameout means that there is a gap in the throttle copy, it means that the idle motor is not working properly. (2) Block the throttle idle bypass hole with your fingers. If it is not closed, it means that there is a gap in the throttle replica. If it goes out, it means that the idle motor is not working properly. 3 solutions. The solution to air leakage of intake manifold and carbon canister solenoid valve is to plug the air leakage point or replace the corresponding parts. The throttle valve has a gap, which can be sealed or replaced by glue. If the idle motor is not working properly, refuel the idle motor. For details, please consult Q874 173572.