What are the seven causes and solutions of car jitter?
1, engine cylinder is missing.
Engine cylinder shortage mainly refers to the abnormal operation of one or more cylinders of the engine, which is generally manifested as: the exhaust gas flow from the automobile is obviously intermittent, and the exhaust pipe is seriously shaken, and the engine jitter can be obviously felt, sometimes accompanied by sudden noise. This is mostly related to ignition coil failure.
2, machine foot glue aging or loose
Foot glue is a rubber block between the engine and the frame. Its function is to reduce the vibration and buffer when the engine works and fix the engine. Once these machine feet are aged or loose, the engine jitter will become extremely serious. The effect will be much weakened after changing the foot glue again.
3, the ignition system problem
Check the working conditions of spark plugs, high-voltage lines and ignition coils. The ignition system is not easy to use, and the spark plug is not in good condition, which will also lead to this failure. Solution: Check whether there is too much carbon deposit in the spark plug and replace the spark plug.
4. The oil pressure is unstable
If the engine carbon deposit has been cleaned, the throttle valve has been cleaned, and the oil pad and spark plug have been replaced, it is still found that the car body is shaking at idle speed, which may be caused by the oil supply pressure and intake pressure sensors. If the oil supply pressure of the oil pump is abnormal, or the intake pressure sensor has an incorrect value or works poorly, the body will shake. Solution: Check the oil pressure and replace parts if necessary.
5. The air filter is dirty
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.
6. The high-voltage line is broken
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, and the resistance that is obviously several times larger can be replaced.
7. The fuel nozzle is blocked
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.
(Photo/Text/Photo: Pacific Auto Network Liang Kexin)