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故障现象。我驾驶一辆张家港制造,配有国产492QA型发动机的面包车去扬州市,从发动到逐渐加速,运转均很正常,但上公路后,车速提高到每小时60千米时,从空气滤清器传来噼噼啪啪的响声,油门继续加大时响声也随之增大。但转速提高不明显。故障排除。开始,我判断可能是点火时间过迟,或是混合气过稀,于是将点火时间提前,提高油平面,但无效,后又更换了分电器及化油器,仍
Symptoms. I drove a van made in Zhangjiagang with a 492QA-made engine to go to Yangzhou City. From start-up to gradual acceleration, the operation was normal. However, after getting on the highway, the speed increased to 60 km / h. From the air filter Came crackling sound came, the throttle continues to increase the sound will also increase. However, the speed increase is not obvious. Troubleshooting. At the beginning, I judged the ignition time may be too late, or the mixture too thin, so the ignition ahead of time to raise the oil level, but invalid, and then replaced the distributor and carburetor, still