故障现象一辆2.5 L法国雷诺科雷傲SUV车,累计行驶8 265 km,出现了发动机怠速抖动,加速无力故障,仪表上的发动机故障灯亮起的现象。故障诊断接车后首先对用户反映的故障现象进行验证。发现该车发动机怠速抖动确实比较严重,仪表上的发动机故障灯亮起(图1)。根据该车发动机故障现象,分析故障原因可能有以下几点:燃油品质 Fault phenomenon A 2.5 L France Renault Koleos SUV car, a total of 8 265 km driving, there was the engine idling jitter, acceleration weakness failure, the instrument on the engine fault light is lit. Fault diagnosis After the first car users to reflect the phenomenon of failure to verify. Found that the engine idling jitter is indeed serious, the engine fault light on the instrument (Figure 1). According to the car engine failure phenomenon, analyze the cause of the malfunction may have the following points: Fuel quality