What is the inspection method for fuel injectors?
2 Answers
Inspection methods for fuel injectors: 1. Specialized equipment testing: Remove the fuel injector and test it on a fuel injector test bench. If the tested injection pressure does not meet the corresponding technical standards, the atomization level of the fuel injector is poor, there is dripping or leakage, and the fuel injector cannot be restored after cleaning and adjustment, it must be replaced. 2. Engine testing: The quality of the fuel injector can be judged by the difficulty of cold engine starting and the exhaust smoke color after starting. If the engine is difficult to start when cold, and the exhaust smoke is white or black after starting, if the fuel supply angle and cylinder pressure are normal, the possibility of fuel injector and high-pressure fuel pump failure is high.
From my experience as a car enthusiast, fuel injector testing is actually quite beginner-friendly. Start with a visual inspection—after starting the engine, check around the injectors for any oil stains or signs of leakage, which are often the first clues. If you spot stains or corroded areas, it likely means the seal is compromised. Next, listen carefully: use a stethoscope or get close to the injector to hear if the ticking sound during injection is regular and even—if one is unusually quiet or loud, it could indicate a coil or circuit issue. Then, use a multimeter to measure resistance; normal readings should be between 12-16 ohms—lower suggests a short circuit, while higher points to an open circuit. For a deeper check, remove the injector and connect it to a tester to observe if the spray pattern is uniform and cone-shaped mist, not dribbling. Safety is non-negotiable: always ensure the engine is cool before testing, avoid hot components, and work in a well-ventilated area since fuel injectors involve flammable substances. Don’t forget to use quality gasoline regularly to prevent residue buildup, which helps maintain engine health.
