Dongfeng Shen Feng ax 5 engine reported p0 122 and p0222 engine jitter.

The air filter is dirty. Air filters are designed to protect the engine and reduce wear. Generally, it will be replaced around 10000 km. If it is not replaced in time, the engine will shake due to insufficient air intake, which can be solved by replacing the filter element. Open circuit of high-voltage line refers to the open circuit of conductor core of high-voltage line, which will affect ignition and cause engine jitter. The resistance can be measured with a multimeter.

Introduction of Dongfeng Shen Feng Engine Jitter

Spark plugs have a life. After exceeding 30,000-40,000 kilometers, the ignition efficiency is obviously reduced, which may affect the ignition. This is the most common fault. Just replace all spark plugs.

The idle speed value of the low idle engine has been set in the computer. When the vehicle speed is low to a certain range, the on-board computer will automatically adjust. If the idle speed is too low, it is beyond the control range of the computer. Some cars have adjusting screws on the accelerator to adjust the idle speed, while others don't.

If the water temperature is abnormal, the working temperature of the engine is within the normal range. When the water temperature is high, the ignition time will be early, the oil-gas mixing ratio will change, the oil viscosity will become thinner and the lubrication performance will become worse. Common fault causes include insufficient antifreeze, thermostat not turned on, fan not turning, jitter caused by inaccurate temperature control switch, etc. All the above faults can be eliminated.

The nozzle is blocked, and the nozzle of the EFI vehicle is the key component of automobile fuel injection, with a long service life, reaching hundreds of thousands of kilometers. However, because there is gum in gasoline, it will block the injection hole of the nozzle, resulting in inconsistent injection quantity of each nozzle, inconsistent operation of each cylinder and engine jitter. The solution is to take it down and clean it.