求翻译：4. 安装节油器一段时间后，若感觉效果下降，甚至尾气排放变差，一般是引擎正在清除内部积碳，因此会感觉不了出省油效果，甚至会影响尾气排放。但这些都有暂时的现象，引擎内部积碳清理完后会逐渐恢复省油及环保效果。是什么意思？

4. install fuel saving devices for a period of time, if feeling effects decline even tailpipe variation, General is an internal carbon engine is clear, so will feel no fuel results and even affects exhaust emissions. But it was a temporary phenomenon, the engine will gradually restore internal carbo

. * 4 oil-saving server is installed after a period of time, or even decline in effect, if feeling bad exhaust emissions, as a general rule, engine is carbon sinks within the province, and therefore feel no effect or even affect oil exhaust emissions. However, these are a temporary phenomenon, and t

4. After installs gasoline economizer period of time, if the feeling effect drops, even the exhaust emissions variations, is generally the engine is eliminating internal carbon deposition, therefore could not be able to feel the province oil effect, even could affect the exhaust emissions.But these

4. install fuel saving devices for a period of time, if feeling effects decline even tailpipe variation, General is an internal carbon engine is clear, so will feel no fuel results and even affects exhaust emissions. But it was a temporary phenomenon, the engine will gradually restore internal carbo

4. install fuel saving devices for a period of time, if feeling effects decline even tailpipe variation, General is an internal carbon engine is clear, so will feel no fuel results and even affects exhaust emissions. But it was a temporary phenomenon, the engine will gradually restore internal carbo