The injector is a key component in the fuel supply system of the automobile engine, and its working condition directly affects the performance of the engine. Therefore, timely detection and elimination of injector failure is essential to keep the engine running well. The following are several common methods for detecting injector failure:
1. Special equipment detection
- Remove the injector and take it to the injector test bench for detection. If the detected injection pressure does not meet the corresponding technical standards, the atomization degree of the injector is not good, there is oil dripping or leakage, and it cannot be restored after cleaning and adjustment, then the injector needs to be replaced.
2. Engine detection
- The quality of the injector is judged by the difficulty of cold engine start and the exhaust smoke color after starting. If the engine is difficult to start cold, the exhaust smoke color after starting is white or black, and the fuel supply angle and cylinder pressure are normal, it may be that the injector or high-pressure oil pump has a fault.
3. Stethoscope method
- When the starter drives the engine to rotate, use a long-handled screwdriver or a stethoscope to listen to whether the injector has a "tick-tick" working sound. If it is difficult to judge due to the influence of other noises, you can use the method of unplugging and plugging the injector harness plug to identify whether the injector is working while listening to the stethoscope.
4. Resistance check
- Disassemble the injector harness connector and use a multimeter to measure the resistance between the two terminals of the injector. The low resistance value of the injector should be 2~3Ω, and the high resistance value of the injector should be 13~16Ω. If the resistance value is not within this range, the injector needs to be replaced.
5. Leakage check
- You can check it on special equipment, or you can remove the injector and the fuel delivery main pipe, connect it to the fuel system, use a special wire to jumper the fuel pump test terminal on the diagnostic socket to the 12V power supply, and then turn on the ignition switch to observe whether the injector has any dripping.
6. Fuel injection quantity check
- You can check it on special equipment, or you can prepare according to the dripping check. Each injector should be checked 2-3 times. The injection amount and uniformity of each cylinder injector should meet the requirements. Otherwise, the injector should be cleaned or replaced.
7. Injection angle and atomization inspection
- Press the cleaning button, the injector sprays normally, and observes the injection angle and injection atomization. The injection angle should be consistent (or according to the factory technical standards of the inspected vehicle), the atomization should be uniform, and there should be no jet phenomenon, otherwise it should be replaced.
8. Fault diagnosis instrument inspection
- Use the fault diagnosis instrument to check whether there is a fault code stored, and further confirm whether the injector has a fault.
Summary
The above methods can help you effectively detect injector faults. If a problem is found in the injector, it should be cleaned, adjusted or replaced in time to ensure the normal operation of the engine. Regular maintenance and inspection of the injector can prevent the occurrence of faults and extend the service life of the engine.
