How to repair the vibration of BMW 525 without cylinder

There are five cases of BMW 525 cylinder jitter.

1, the carbon deposit in the valve and intake port has very good adsorption, so when the intake valve, exhaust valve and intake port produce serious carbon deposit, the engine with manifold injection will be partially adsorbed by the carbon deposit during fuel injection. In fact, the preset value of fuel entering the cylinder is different from that of ECU, and the energy released by the mixer body after combustion can not meet the power demand, which will lead to jitter. In this case, the method of cleaning the throttle valve is straightforward. However, at ordinary times, prevention should be given priority to. Do not idle for a long time, occasionally pull down the high speed, and you can also use reliable fuel cleaning additives.

2. Deviation of cylinder working conditions After the engine is used for a long time, some internal clearances will be different. Spark plug gap is one of the most common phenomena. Because the running computer can't diagnose the gap deviation, it still follows the normal procedure. In this case, the small power of a single cylinder will cause jitter. After the gap between the cylinder liner and the piston becomes larger, high-temperature gas is easy to leak out of the gap because there is no good oil lubrication during cold start, thus reducing the power output.

3. The water temperature sensor is out of order. The water temperature sensor is one of the important bases for the computer to judge the working condition of the engine at that time. If the engine temperature is-10℃ during cold start, but the sensor "tells" the computer that the current temperature is 10℃, then the computer will inject oil under the working condition of 10℃, and the amount of oil is small, which will naturally cause jitter.

4. The oil pressure is unstable. If you have cleaned the engine carbon deposit, cleaned the throttle, changed the oil pad and spark plug, you still find that the body is shaking when idling. It is recommended to go to 4S shop to check whether the fuel supply pressure and intake pressure sensors are normal. Abnormal oil supply pressure of oil pump or numerical error and poor operation of intake pressure sensor will cause vehicle body jitter. The solution is to check the oil pressure and replace the parts if necessary.

5. Oil problem If the car requires the use of No.95 gasoline and you add No.92 gasoline, it may cause the car to shake. When the oil can't reach the standard, the combustion can't reach the corresponding calorific value, resulting in a small power output of combustion. In addition, if the label is added correctly, poor oil quality may also lead to engine jitter.