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一辆上海通用别克GL8乘用车,出现提速缓慢,行驶无力,换挡冲击的故障。检查分析连接故障检测仪进行检测,调得的故障代码为P1404——EGR阀电路故障,故障代码可以清除。接上故障检测仪进行路试,感觉轿车行驶时发动机动力明显不足,能感觉变速器有换挡过程,但不是很明显,而且有冲击感。将车停稳后重新起步,观看4挡、3挡和1挡时的数据流,发现1挡至3挡换挡正常,当发动机为3 000 r/min时继续加速,发现挡位由3挡升至4挡,但马上又掉入2挡,在
A Shanghai GM Buick GL8 passenger car, there slow speed, driving weak, shifting the impact of the fault. Check the analysis Connect the fault detector for detection, tune the fault code P1404 - EGR valve circuit fault, the fault code can be cleared. Connected to the fault detector for road test, feeling the engine when driving car significantly less power, can feel the gear shift process, but not obvious, but also a sense of impact. After the car parked steady start, watch 4 block, 3 block and 1 block when the data flow and found 1 block to 3 block shift normal, continue to accelerate when the engine is 3000 r / min and found the gear from 3 block Lifted to 4 block, but immediately fell into the second block, at