The instability of the engine is easy to judge and maintain the engine is not stable, it directly affects the vehicle’s power and economy, as well as the comfort of passengers, vehicle emissions, etc.. Therefore, when the vehicle engine is unstable, how do we determine the cause of the fault, so as to restore the normal operation of the method.
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. Use fuel pressure gauge and fuel gauge assembly to connect tubing and gauge. Start the engine and allow it to enter idle speed, fuel meter should be read in the 270-320kpa (2.8-3.3kgf / cm2 40-47psi) range. 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, also need to carry out the connection between the main PGM-FI and the plug connection point between the wire and the plug connection between the nozzle is broken, bad connections and other faults.
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 fuel pump does not work, first check whether the oil pump burned out. Check whether the PGM-FI main relay and the plug terminal is connected, etc..
5, and then check the cylinder compression pressure, the gap between the exhaust valve, fuel vapor control solenoid valve, EGR valve cylinder work, intake manifold is leaking, etc..
Caused by the northern part of the Mercedes Benz engine instability in Baotou, there are many reasons, therefore, in the actual work should be based on the specific situation analysis, in order to accurately identify the cause of the problem and solve the problem.