How to Solve Fuel Injector Failure?
2 Answers
If the fuel injector failure is caused by the needle valve being clogged with dirt, the injector should be disassembled, cleaned, inspected, and readjusted. Due to the continuous scouring of high-pressure fuel flow, the injection hole of the needle valve will gradually enlarge, leading to a drop in injection pressure. You can place a steel ball with a diameter of 4mm to 5mm at the hole end and gently tap it with a hammer to cause local plastic deformation of the hole, thereby reducing its diameter. For multi-hole direct injection injectors, which have numerous small holes, only a punch made of high-speed steel can be used to lightly tap the hole end. If the injector still fails to meet standards after adjustment, the needle valve assembly should be replaced. The frequent reciprocating motion of the needle valve can cause the end face of the needle valve body to gradually form a pit over time, increasing the needle valve lift and affecting the injector's normal operation. The needle valve body can be clamped on a grinding machine to regrind this end face, followed by fine polishing on a glass plate with fine abrasive paste.
I remember last time when my car's fuel injector had issues, the idle was shaking badly and consuming more fuel, so I tried to fix it myself. First, I checked the fuel pressure to ensure the fuel pump was working properly; if the pressure was low, it might be due to clogged fuel lines or stuck injectors. Trying a high-quality fuel additive for cleaning can sometimes resolve minor clogs. If you really need to remove the injectors, make sure to disconnect the power for safety, and use professional cleaning tools or send them for ultrasonic cleaning—but for complex models, it's best to consult a technician. In case of electronic control failure, check for loose wiring connections, as injector connectors are prone to oxidation. Finally, if the injector is completely damaged, replacement is the only option—choose quality branded parts and ensure proper sealing during installation to avoid leaks. For regular maintenance, don’t forget periodic fuel system checks to avoid major repairs later.
