Engine work is not stable, it directly affects the car's power and economy, as well as passenger ride comfort, vehicle emissions of pollutants and so on. So when our vehicles instability occurs when the engine is working, how do we determine the reasons for its failure to restore normal working methods.
1, check spark plugs and sub-cylinder line. Spark plug gap meets the original technical standards, sub-cylinder line resistance values are also consistent with the technical requirements, which do not meet the need for adjustment or replacement.
2, the need for testing the fuel pressure system. Using fuel pressure gauge and fuel gauge components, connectors tubing and fuel gauge. Start the engine and make it into the idling fuel elm327 bluetooth gauge reading should be within (2.8-3.3kgf / cm2 40-47psi) range 270-320kpa. If the pressure exceeds the technical specifications, you need to replace the fuel pressure regulator and fuel filter.
3, check the cylinder air nozzle. Enter the engine idling, respectively disconnect each injector plug, check whether there are changes idle, if disconnected injector for each cylinder, idle reduction is basically the same, then the fuel injectors work were normal. When disconnecting one injector, engine idling and stability did not change, you need to measure the resistance value injector plugs are 10-13, if you do not meet the standards replace the nozzle. Of course, also need to check the PGM-FI main relay connector plug with the wire connection between the connection point between the point of rupture and the injectors if the wires, connection failure and other failures.
4, fuel pump and fuel pump circuit checks. Check the fuel pump: Remove the fuel tank cap, ignition switch in the ON position, the fuel filler can hear the sound of the pump operation, under normal operating conditions, when the ignition switch is ON, the fuel pump should run two seconds bell. If the fuel pump does not run, first check the pump Scania VCI 2 SDP3 insurance is burned. Check whether the conduction between PGM-FI main relay and the plug terminals through and so on.
5, followed also check the cylinder compression pressure, intake and exhaust valve clearance, fuel vapor control solenoid valve, EGR valve cylinder work, intake manifold leaks and so on.
Instability causes the engine to work a lot, so in practical work should be analyzed according to the specific circumstances in order to find out the cause of the malfunction and accurate method to solve the problem.
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