高压线漏电或断路火花塞；喷油器雾化漏油或堵塞；油路压力太低；EGR（废气再循环控制）阀卡住常开，不能关闭；空气流量计有故障；怠速调整不当，怠速控制阀或附加空气阀工作；空气滤清器堵塞；进气系统或真空系统漏气...
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EGR系统的关键就是控制废气的引入量，使废气的再循环量在每一个工作点都达到最佳状况。
The key to an EGR system is introduced, and the control of exhaust gas quantity recirculation quantity of that in every point at best.
阐述了降低排放的关键技术，包括缸内控制、废气再循环、可变涡轮增压、4气阀、共轨和排气后处理技术。
The key technologies to lower the exhaust emission, included the in-cylinder control, exhaust gas recirculation, variable geometry turbo, 4-valve, common rail and after-treatment are presented.
本文论述了先进的控制型和诊断型传感器在催化转换器、电子喷油器和废气再循环系统等汽车防污染装置中所起的关键作用。
It is stated that advanced control and diagnostic sensors play a key role in car antipollution devices such as catalytic converters, electronic fuel injection, and exhaust-gas recycle systems.
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