故障现象一辆行程约为8.5万km的KLQ6856型苏州金龙客车(装玉柴YC4G200-30电控高压共轨柴油机,电控系统为博世公司的EDCT系统),因发动机产生异响,动力不足前来我厂检修。检查诊断接车后检查机油和冷却液,正常;进、排气管路也良好。接通点火开关后发动机能顺利起动着机,发动机故障灯自检后能正常熄灭,但发动机抖动严重,加 Fault phenomenon A trip is about 85,000 km KLQ6856 Suzhou Jinlong Bus (equipped with Yuchai YC4G200-30 high-pressure electronic control common rail diesel engine, the electronic control system for the Bosch EDCT system), due to abnormal sound generated by the engine, before the lack of power I plant maintenance. Check the diagnosis after the car and check the engine oil and coolant, normal; into the exhaust pipe is also good. After the ignition switch is turned on the engine can start smoothly, the engine fault light self-test can be normally off, but the engine jitter serious, plus