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故障现象一辆上汽名爵MG5轿车(配备1.5 L VTi发动机),仅行驶约300 km,发动机冷机起动困难,有时甚至无法起动;在刚起动着机的几分钟内加速困难,起步后无法提速,但短时间后又可以恢复正常行驶。故障诊断笔者经过了解得知,几乎每天早上该车发动机都起动困难,好不容易将发动机起动着机后,却无法加速,但是没过多长时间又能自动恢复正常。该车曾因上述故障到某4S店检修,当时用故障检测仪也读不到故障代码;查看数据流,也没有发现明显异常数据,但尽管如此,该4S店还是
Symptom A SAIC MG5 sedan (equipped with 1.5L VTi engine), only about 300 km, the engine cold start difficult, and sometimes can not start; just start the machine within a few minutes to accelerate difficulties, after the start can not speed, But after a short time can return to normal driving. Troubleshooting I learned that, almost every morning the car engine start difficult, finally the engine start the machine, but can not accelerate, but not too long time can automatically return to normal. The car was due to the above failure to a 4S shop overhaul, when the fault detector can not read the fault code; view the data stream, did not find significant abnormal data, but in spite of this, the 4S shop or