Cleaning the accelerator pedal clutch increases the speed.

This situation is a common problem in repair shops. Let's talk about speed first. Generally, it is normal that the engine speed is around 750-800, and it does not exceed 1000 rpm. If there is carbon deposit in the throttle, the engine speed will decrease. If it is less than 500 rpm, the engine will be easy to stall in the morning and not easy to start. The solution is to clean the throttle. When the carbon deposit in the throttle is removed, the idle speed of the car will increase, generally around 1500. At this time, it is necessary to match the throttle or the idle speed will decrease after driving for a certain mileage (depending on the vehicle type). For example, your vehicle should accelerate to 3000 rpm. Wait for the car to cool before you start observing.

2. The engine fault light mainly tells you the running state of the engine. At present, cars pay more and more attention to exhaust emissions. If the exhaust emission exceeds the standard, the engine fault light will light up. Your car is Chery QQ. The emission standard should be Euro 3, burning 93 # and above gasoline (marked on the tank cover). If 90 # gasoline is burned, it does not meet the combustion standard, and the fault light is on. Because there is nothing wrong with the hardware itself, the fault code will disappear after power failure. If you use No.90 oil for a long time, the service life of your oxygen sensor will be greatly shortened, and the fault light will always be on. The price of oxygen sensor is generally around 1200 yuan.