Power clean throttle

The air filter is designed to protect the engine from wear and tear, and it is usually replaced at about 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.

High-voltage line break: High-voltage line break refers to the break of the core of high-voltage line, which will affect the ignition and cause engine jitter. You can use a multimeter to measure the resistance, and change it to a resistance that is obviously several times larger.

Spark plug life:

Spark plugs have a long 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.

Low idle speed: the engine idle speed value has been set in the computer. When the number of revolutions is low to a certain range, the car 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. This kind of car can check the idle valve, throttle, air flowmeter, vacuum sensor and adjust the ignition time (car with distributor) to improve the idle speed. Low water temperature can also lead to low idle speed, so check and replace the thermostat.

Abnormal water temperature:

The working temperature of the engine is within the normal range. When the water temperature is high, the ignition time will be earlier, 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.

Nozzle clogging:

The fuel nozzle of EFI vehicle is the key component of automobile fuel injection, and its service life is very long, which can reach 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.

Carbon deposit and oil dirt blockage:

Throttle, idle valve and air intake will be blocked by carbon deposit and oil dirt after a period of use, and the air intake will be blocked, which will affect the idle stability and jitter. It can be solved by checking and cleaning the above parts with cleaning agent without disassembly and cleaning.

Cylinder depression:

The engine has three cylinders, four cylinders, five cylinders, six cylinders and eight cylinders. If a cylinder doesn't work well, it will be short of cylinder and the engine will shake. Three-cylinder engine is the most obvious, followed by four cylinders. Check the cylinder pressure with the cylinder pressure gauge and solve the problem of low pressure with the first bus. First Bus has a unique effect on cylinder depression and imbalance. It can be added to engine oil or directly to the cylinder to restore the cylinder pressure balance.

Matters needing attention

Engine idle speed value: refers to the speed at which the engine runs normally without refueling or driving after ignition.