Nissan Bluebird engine is difficult to start and can't accelerate. Troubleshooting: A Nissan Bluebird SSS car equipped with a 4-cylinder 16 electronically controlled fuel injection engine. When starting, the engine needs to be started several times before it can start running; The acceleration is weak during driving, and the dynamic performance is degraded, but the fault light is not on. Fault diagnosis, analysis and treatment: firstly, use the golden Pentium decoder to retrieve the fault code, turn on the ignition switch, and read the fault code as 052, indicating that the knock sensor is faulty. In order to further confirm the authenticity of the fault code, first use the instrument to eliminate the fault code. Then start the engine, adjust the fault code again, and still get the fault code 052. Remove the knock sensor from the engine, and measure its resistance with an ohmmeter as ∞, indicating that the knock sensor has been damaged. After replacing the new knock sensor, the fault code no longer appears. However, it is difficult to start and the phenomenon of weak acceleration still exists. According to the maintenance experience, one of the reasons for the above failures is the poor performance of the ignition system; Second, the fuel supply system is out of order. Check the ignition system first and find that the high-pressure fire is normal. Remove four spark plugs from the engine and observe that their electrodes are gray, which indirectly proves that the mixture is lean. At the same time, it is found that the gap between spark plug electrodes is too large due to ablation. After replacing four new spark plugs of the same model, the fuel injector was cleaned. Then start the engine, and the failure of starting difficulty is improved, but the acceleration performance of the vehicle is still not ideal. Further check the fuel supply system and install the fuel pressure gauge on the oil inlet pipe with a special interface. Start the engine and observe that the indicated value of the fuel pressure gauge is 176kPa. Obviously, the fuel pressure in the fuel supply system is low. The reasons for the low pressure of the fuel supply system are: 1, the performance of the fuel pump is degraded or its filter screen is blocked; 2. The fuel filter is blocked; 3, fuel pressure regulator failure, etc. Remove the fuel pump from the fuel tank and observe whether the filter screen is clean. The fuel pump is semi-submerged in the fuel barrel, and the battery is used to directly supply power to the fuel pump. The test results show that the injection pressure of the fuel pump is acceptable, but a new fuel pump and a new fuel filter of the same model are replaced. After starting the engine for road test, its acceleration performance has not been significantly improved. After a series of inspections, the fault source is concentrated on the fuel pressure regulator. Disconnect the oil return pipe on the oil supply main pipe, start the engine and observe the oil return (pay attention to take measures to guide the oil return into the container to prevent fire). According to previous maintenance experience, it is found that when the engine is idling or accelerating, the performance of the fuel pressure regulator is poor and the oil return is greater than that of normal vehicles. After replacing a new fuel pressure regulator of the same model, start the engine again and the engine will land smoothly. In the road test, the car has good acceleration performance. Thorough troubleshooting [img]/images/post/smile/qw/61.gif [/img] Follow-up: 5000 words! ~ big brother replied: dizzy, big brother! You have to write the paper yourself, and you can't pass the copied paper. You can find some more from the internet and put them together, and that's yours! Follow-up: nothing ~ you can send it in detail! ~ as long as there are enough words, you can answer: the key is not here! I will give it to you earlier! alas