故障现象一辆桑塔纳99新秀轿车,配备AFE发动机,进厂报修怠速异常的故障。该车故障的具体表现为:有时怠速转速很高,达到2000 r/min,有时又会忽高忽低(在500 r/min～1 800 r/min波动),在行驶时伴有发动机不规则熄火。故障诊断接车后,首先验证故障现象。由于该故障是偶发性的,进行一段时间试车后,没有出现上述故障现象,因客户急着用车,只好按常规做了一些简单的检查和维护,清 Symptoms A Santana 99 rookie car, equipped with AFE engine, factory repair idle fault abnormal failure. The specific performance of the car failure: sometimes idling speed is very high, reaching 2000 r / min, and sometimes will be fluctuated (at 500 r / min ~ 1800 r / min fluctuations), accompanied by engine irregularities Stalled. Troubleshooting After you pick up the car, first verify the problem. As the fault is sporadic, after a period of test drive, did not appear the above symptoms, because customers are anxious to use the car, had to do some simple checks and maintenance routine, clear