How to Determine the Condition of Electronic Fuel Injection Diesel Engine Nozzles?
2 Answers
Observe whether there is black smoke, check if the vehicle has sufficient power, and listen to see if the engine sound is normal. Open the valve cover, remove the return pipe, and start the vehicle to check the amount of return oil. If the return oil spurts out like a spray, then the nozzle is damaged. The fuel injection pressure of the nozzle is too low; the fuel from the nozzle does not atomize or shows obvious oil flow shooting downward.
I also encountered an issue with diesel injectors the other day, and it took me the whole afternoon to figure it out. Generally speaking, to determine whether an injector is good or bad, you can start by observing the symptoms: for example, difficulty starting the engine, severe shaking at idle, lack of power during acceleration, or black smoke from the exhaust—these could all indicate injector problems. I've tried listening for the 'clicking' sound; if an injector doesn't make that sound while the engine is running, it might be faulty. You can also use a multimeter to measure its resistance—the normal value should match the manual's specifications, and a significant deviation suggests internal damage. Don’t overlook checking for leaks; if there’s oil residue near the injector, it needs replacement. I recommend beginners avoid disassembling things randomly. It’s better to connect a diagnostic tool to check for trouble codes, which will show exactly which cylinder’s injector is faulty. Also, don’t skimp on regular maintenance—use good-quality diesel and replace the fuel filter periodically to prevent injector clogging and extend its lifespan.
