一辆奥迪A6 1.8T乘用车,因发动机怠速抖动而来我厂检修。用VAG1552故障阅读仪检测,存在多缸失火故障。为准确判断故障部位,将发动机电控单元内的故障代码全部清除,重新试车检查,发现第3缸失火。更换该缸点火线圈后试车,状况良好,该车修竣出厂。过了两天,驾驶员反映,该车出现了发动机转速不稳、排气管冒黑烟的故障。用VAG1552故障阅读仪 An Audi A6 1.8T passenger car, because of the engine idling jitter come from our factory overhaul. With the VAG1552 fault reader test, there is a multi-cylinder misfire. To accurately determine the fault location, the engine ECU’s fault code cleared, re-commissioning test found that the first three cylinder fire. Replace the cylinder ignition coil after the test, in good condition, the car repair completed factory. Two days later, the driver reflected that the car appeared unstable engine speed, black smoke exhaust pipe failure. Use VAG1552 fault reader