故障现象一辆2016年产奥迪A6L车(搭载3.0T机械增压发动机),因发动机怠速抖动进店检修。故障诊断接车后试车,发动机运行正常,无明显抖动。用故障检测仪检测,发动机控制单元中存储有故障代码“P130A00气缸压缩比”和故障代码“P030400气缸4检测到不发火”。检查气缸4的点火线圈和火花塞,发现火花塞头部明显发黑且潮湿,并伴有燃油味,说明该气缸确实燃烧不好。在热机的情况下,将发动机熄火,读取油轨压力测量值,油轨压力不断升高,说明喷油器不存在泄漏 Fault phenomenon A 2016 Audi A6L car (equipped with 3.0T supercharged engine), due to engine idle jitter into the shop overhaul. Troubleshooting After the test car, the engine is operating normally, no obvious jitter. Detected by the fault detector, the engine control unit stores the error code “P130A00 cylinder compression ratio” and the error code “P030400 cylinder 4 detected no ignition”. Check the cylinder 4 ignition coil and spark plug and found that the spark plug head was obviously black and humid, accompanied by fuel taste, indicating that the cylinder does not burn properly. In the case of heat engine, the engine flameout, read the rail pressure measurement, the rail pressure is rising, indicating that the injector does not exist leakage