What should I do if the idle speed is high after QQ washing the throttle?

1, check whether the intake pipe leaks, whether the vacuum pipe falls off, whether it is damaged, and whether the intake pipe is damaged (the intake pipe of some models is rubber pipe) for mechanical failure caused by high idle speed. Because the air intake of the engine is very small at idle speed, if there is air leakage, it will cause high idle speed.

2. Leakage of fuel injector may lead to excessive fuel supply, which may lead to higher idle speed than normal.

3. For EFI engine models with fuel vapor recovery system, fuel vapor should not enter the intake pipe at idle speed. If fuel vapor is sucked into the intake pipe at idle speed due to system failure, the idle speed is higher than normal.

4. After cleaning the throttle body and idle speed control valve, the engine may have a high idle speed after starting, which requires a learning process for the computer. Because the engine idle speed will decrease after the throttle body and idle speed control valve are dirty, in order to stabilize idle speed, ECU will control the opening of idle speed control valve or throttle valve to increase the intake air, thus stabilizing idle speed. After cleaning, the ECU also controls the air intake according to the original opening, and the engine idle speed will increase.