For electronically controlled fuel injection systems, the impact of air intake system leakage on engine operation is much greater than that of carburetor type cars. Because on the electronically controlled fuel injection engine, the air leakage is not measured by the air flow meter, and the air-fuel ratio has a great influence. Therefore, in the event of engine failure, check the air flow meter, throttle body, auxiliary air valve, idle speed stability valve and exhaust gas recirculation valve for looseness, air hose and its joints for damage or air leakage.
After the engine is turned off, there is still a certain amount of fuel in the pipeline, so the fuel should be prevented from being ejected when the tubing is removed.
The sealing gasket in the oil pipeline is disposable and should be replaced when assembled. Do not reuse it.
When installing the injector 0 445 120 002, be careful not to damage the newly replaced O-ring to avoid affecting the injector’s tightness. When installing, apply oil to lubricate the O-ring first. Do not lubricate with oil and gear oil.
When checking the fuel injection performance of the injector, it must be clear whether the injector is high resistance or low resistance. The high-resistance type resistor is generally 12 to 14 ohms, and can be directly connected to the battery for fuel injector injection performance test. However, the resistance of the low-resistance injector electromagnetic coil is generally only 2 to 3 ohms. If the battery is directly connected to the battery, the injector will be burnt due to excessive current. A special connector must be used to connect the battery. If a normal wire is used, a resistor of 8 to 10 ohms needs to be connected in series.
Air flow sensors DLLA145P870 are precision components that have a significant impact on engine performance. When removing the air flow meter, it should be handled gently and do not disassemble the air flow meter to avoid damage or affect its detection accuracy. Do not rinse with water or cleaning solution when cleaning the air flow meter.
The adjustment screw on the air flow meter is used to adjust the carbon monoxide content at idle. Under normal circumstances, it should not be moved. Improper adjustment will cause the engine’s power to drop and fuel consumption to increase.
After long-term use of the water temperature sensor ND5083, the performance will change, causing an error in the water temperature signal, which will adversely affect fuel injection, ignition time and fuel pump operation. The change in performance parameters of the water temperature sensor (not short circuit or open circuit) is often not recognized by the self-diagnostic system. Therefore, when the engine is not working properly (such as unable to start, idle speed, fuel consumption increase, etc.), and the fault self-diagnosis system does not indicate the water temperature sensor fault code, do not ignore the inspection of the water temperature sensor.
When servicing the oxygen sensor, be careful not to let the oxygen sensor fall and collide with other objects. When replacing, be sure to use a special anti-adhesive brush to apply the thread to avoid difficulty in disassembly next time.
