The engine is not stable, it directly affects the vehicle’s power and economy, as well as the comfort of passengers, increase vehicle emissions, etc.. Therefore, when the vehicle is unstable when the engine is working, we have to determine the cause of the fault, so as to restore the normal operation of the method. Check steps are as follows:
1, should check the north part of Baotou Benz spark plug and cylinder line. Spark plug gap is in line with the original technical standards, the resistance value of the cylinder line is also in line with the technical requirements, such as the need to adjust or replace.
2, the need for fuel pressure detection system. Check the fuel pressure gauge and the fuel gauge assembly, connect the oil lines and oil gauge. Start the engine and allow it to enter idle speed, fuel meter reading should be within the range of 270~320kpa. If the pressure exceeds the technical specifications, you need to replace the fuel pressure regulator and fuel filter.
3, check the northern part of the Mercedes Benz accessories Baotou cylinder nozzle. The engine into the idle, respectively disconnect each injection nozzle plug, check the idle if there are changes, the nozzle if the disconnection of each cylinder, reduce the idle speed is basically the same, the nozzle to work properly. When disconnected from a nozzle, no change in the engine idle speed and stability, need measuring nozzle plug resistance value is 10~13, if you do not meet the criteria to replace fuel injector. Of course, it is necessary to carry out the PGM – FI main relay and the plug connection between the wire inspection, plug connection point and the nozzle between the wire is broken, bad connections and other failures.
4, fuel pump and fuel pump circuit check. Fuel pump check: unscrew the fuel tank cap, the ignition switch in the ON position, the fuel filler can hear the pump running sound, in the normal condition, when the ignition switch is in the ON, the fuel pump should be run for 2 seconds. If the pump is not running, first check whether the burn pump insurance. Check whether the PGM FI main relay is connected with the plug terminal, etc..
5, and then check the cylinder pressure, intake and exhaust valve clearance, fuel vapor control solenoid valve, EGR valve cylinder work, Baotou Benz parts north of the intake manifold is leaking, etc.. There are many reasons for the instability of the engine, so it is necessary to analyze the actual situation in order to find out the cause of the problem and solve the problem.