What Causes a Short Circuit in the High-Pressure End of the BMW N55 Fuel Injector?
1 Answers
BMW N55 fuel injector high-pressure end short circuit is caused by carbon deposits. Fuel Injector: Modern automotive fuel injectors are essentially simple solenoid valves. When the solenoid coil is energized, it generates a magnetic force that lifts the needle valve, opening the injection port. Fuel is then sprayed at high speed through the annular gap between the needle valve's tip and the injection port, forming a fine mist that facilitates complete combustion. Troubleshooting: If the injection port is clogged, it can be cleared using a cleaning needle, followed by thorough cleaning. Poor contact between the large flat surface of the needle valve body and the injector body, or significant wear on the needle valve's cylindrical surface. If the large flat surface of the needle valve body does not contact the injector body properly, apply chromium oxide to a flat plate and perform figure-8 grinding. If the needle valve's cylindrical surface is heavily worn, replace the needle valve assembly in pairs. Poor sealing between the needle valve and its body can lead to poor atomization or dripping. If air is present, simply purge the air from the fuel line. For poor fuel supply, inspect and repair the fuel transfer pump. If the fuel line connector leaks, ensure it is properly sealed. Insufficient spring tension or a broken piston spring requires spring replacement. If piston wear affects fuel supply, replace the piston.
