一辆桑塔纳2000GLi乘用车,采用AFE发动机,累计行程为18万km,怠速时出现发动机转速在650r/min～1050r/min间游动,而且抖动严重,加速无力。首先试车验证故障现象。起动发动机后,发现发动机在怠速运转时抖动严重,好像有个别气缸工作不良,加速时抖动现象有所好转。于是拔下分缸线,插上备用火花塞进行试验,发现各分缸线跳火状况 A Santana 2000GLi passenger car, the use of AFE engine, the cumulative stroke of 180,000 km, idling engine speed at 650r / min ~ 1050r / min walk between, and severe jitter, acceleration weakness. First test to verify the fault phenomenon. After starting the engine, it was found that the engine wobbling heavily at idle speed, as if there were some cylinders working badly, and the jitter phenomenon was improved when accelerating. So unplug the cylinder line, insert a spare spark plug to test and found that the cylinder status jump fire