▁for ▁faster ▁R PM ▁control , ▁hence ▁faster ▁stopping ▁in ▁emer gency ▁situations . ▁ ▁Em issions ▁ ▁Cam less ▁engines ▁are ▁able ▁to ▁produce ▁less ▁em issions ▁than ▁their ▁equivalent ▁cam sh aft ▁counter parts ▁because ▁they ▁are ▁able ▁to ▁more ▁precisely ▁control ▁the ▁comb ust ion ▁procedure , ▁allowing ▁for ▁more ▁complete ▁comb ust ion ▁of ▁all ▁hydro car b ons . ▁The ▁computer ▁is ▁able ▁to ▁sense ▁when ▁not ▁all ▁of ▁the ▁fuel ▁is ▁being ▁consum ed ▁and ▁immediately ▁relax ▁val ve ▁tim ings ▁to ▁supply ▁less ▁fuel ▁to ▁a ▁cyl inder . ▁The ▁EC U ▁can ▁constantly ▁adjust ▁val ve ▁timing , ▁height ▁and ▁fuel / air ▁mi xt ures ▁to ▁optimize ▁efficiency ▁for ▁a ▁given ▁R PM / tor que ▁load . ▁It ▁can ▁sense ▁when ▁there ▁is ▁a ▁high ▁amount ▁of ▁NO x ▁and ▁SO x ▁( S ulf ur ▁ox ide ) ▁emission ▁and ▁change ▁the ▁timing ▁to ▁make ▁the ▁exhaust ▁gas ▁hot ter ▁or ▁cool er . ▁Since ▁the ▁engine ▁is ▁run ▁electron ically ▁and ▁not ▁mechan ically , ▁cam less ▁engines ▁can ▁be ▁updated ▁to ▁meet ▁new ▁emission ▁reg ulations ▁without ▁mechanical ▁modifications . ▁ ▁F uel ▁In jection ▁ ▁Cam less ▁engines ▁can ▁further ▁reduce ▁NO x ▁em issions ▁with ▁the ▁use ▁of ▁fuel ▁st aging . ▁Instead ▁of ▁simply ▁inject ing ▁a ▁constant ▁stream ▁of ▁fuel , ▁fuel ▁st aging ▁inject s ▁the ▁fuel ▁at ▁the ▁optimal ▁time ▁for ▁the ▁most ▁complete ▁comb ust ion . ▁F uel ▁injection ▁can ▁shut ▁off