Cov tsos mob ntawm qhov tawg ib-txoj kev valve hauv lub tsheb

Nyuaj hauv kev pib lub cav, lub cav shakes, tsis ruaj tsis khov ceev, tsis muaj zog acceleration, substandard emissions, engine txhaum lub teeb rau, thiab lwm yam. Yog hais tias ib-txoj kev valve yog ib txwm qhib, nws yuav ua rau lub tsheb emit dub pa luam yeeb thiab nce roj noj; yog hais tias ib-txoj kev valve yog ib txwm kaw, nws yuav cuam tshuam rau lub tsheb cov pa emissions thiab nws muaj feem ntau tias nws yuav tsis dhau qhov kev tshuaj xyuas txhua xyoo.