After having his own car, we must understand a little maintenance of common sense, which can effectively prolong the life of the car and do not delay its activities, the engine work is not stable, it directly affects the power and economy of the car, the comfort of the passengers, and the emission of the pollution of the car and so on. Therefore, when our vehicle is unstable, we should distinguish the cause of its failure and restore its normal work. The inspection steps are as follows:

1, the spark plug and the cylinder line should be checked. Whether the gap of the spark plug is in line with the original technical standard, and whether the resistance value of the cylinder line is also in line with the technical requirements, if it does not meet, it needs to be adjusted or replaced.

2, the test of fuel pressure system should be carried out. Check fuel pressure gauge and fuel pressure gauge assembly, connect oil tube and oil meter. The fuel meter reading should be in the range of 270~320kpa when starting the engine and making it enter idle. If the pressure exceeds the technical specifications, the fuel pressure regulator and fuel filter need to be replaced.

3, check North Baotou Mercedes Benz accessories cylinder jets. The engine will enter the idle operation, disconnect each nozzle plug respectively, check whether the idle speed is changed, if the nozzle of each cylinder is disconnected, the idle speed is basically the same, then the nozzle work is normal. When an injector is opened, the engine idling and its stability are not changed, and the resistance value of the nozzle plug is measured to be 10~13, and if the nozzle is not in conformity with the standard, the nozzle is replaced.

Of course, it is necessary to check the wire between the PGM FI main relay and the plug connection point, whether the plug connection point and the nozzle between the injection nozzle have broken down, bad connection and other faults.

4, fuel pump and fuel pump circuit inspection. Fuel pump inspection: unscrew the fuel tank cover, the ignition switch in the ON position, at the fuel injection port can hear the oil pump operation sound, in normal working conditions, when the ignition switch at ON, the fuel pump should run for 2 seconds. If the fuel pump doesn't work, first check whether the oil pump is burned. Check whether PGM FI main relay is connected with plug terminals and so on.

5, secondly, we should check the pressure of the cylinder of the Mercedes Benz parts in the north of Baotou, the clearance of the inlet and exhaust doors, the control of the electromagnetic valve, the working condition of the EGR valve cylinder, the air leakage of the intake manifold and so on.

There are many reasons for the unstable work of the Mercedes Benz parts in the north of Baotou. Therefore, in the actual work, we should analyze it according to the specific conditions in order to find out the cause of the failure and the method of solving the problem.