在治理化油器式发动机排放超标的车辆中,经常发现这样一种故障现象:气缸压力正常,点火系技术状况良好,化油器也进行了认真的清洗,但就是排放严重超标,并伴有发动机急速不稳现象。此故障的原因何在?经过反复查找,原来是由化油器急速油针损坏引起的。 实践中发现,当化油器急速油针前端锥体出现沟槽、台阶或尖端部分断损时,都会造成发动机怠速不稳、排放超标 In the management of carbureted engine emissions exceeding vehicles often found such a failure phenomenon: the cylinder pressure is normal, the ignition system is in good condition, the carburetor has also been carefully cleaned, but it is a serious emissions exceeded, accompanied by The phenomenon of rapid engine instability. What is the cause of this failure? After repeated search, it turned out to be caused by carburetor rapid needle damage. Practice found that when the carburetor rapid needle front taper groove, step or tip part of the broken, will cause the engine idle speed instability, excessive emissions