一辆2006年产波罗1.4 L轿车,累计行驶近4000 km,发动机出现怠速抖动的故障。用VAS5051检测,发现有第4缸失火的偶发性故障。调换第3、4缸点火线圈试车,故障依旧。拔下第4缸火花塞试火,跳火正常,而且火花塞上有汽油,说明该缸喷油器喷油。测量气缸压力,发现第4缸的气缸压力为0.63 MPa,其他3个气缸的压力均为1.13 MPa左右。因为该车为新 A 2006 Boluo 1.4 L sedan, a total of nearly 4000 km driving, the engine idling jitter failure. VAS5051 test and found that there is a fourth cylinder accidental fire failure. Replace the 3,4 cylinder ignition coil test, the fault still. Unplug the 4th cylinder spark plug test fire, flash fire normal, and the spark plug on gasoline, indicating that the cylinder injector fuel injection. The cylinder pressure was measured and the cylinder pressure in the 4th cylinder was found to be 0.63 MPa. The pressure in the other 3 cylinders was about 1.13 MPa. Because the car is new