i-spark plugs, eyaziwa ngokuba yi-fire plugs, iya kusebenza njenge-pulse ye-high-voltage piezoelectric discharge evela kwi-high-voltage lead (iplagi yomlilo), eya kuphula umoya phakathi kwe-electrodes ye-spark plugs, ukuvelisa i-sparks zombane ukuvutha umxube wegesi kwi-cylinder. Iimeko ezisisiseko ze-injini yokusebenza ephezulu: i-spark ephezulu ezinzileyo yamandla, umxube ofanayo, umlinganiselo ophezulu woxinzelelo. Iimoto ezineenjini zokutsha zangaphakathi zisebenzisa i-petroli kunye ne-diesel fuel. Kwimarike yemoto yaseTshayina, iimoto zepetroli zithatha indawo enkulu. Iinjini zepetroli zahlukile kwiinjini zedizili kuba i-petroli inendawo ephezulu yokutshisa (emalunga nama-400 degrees), efuna ukunyanzeliswa komlilo ukutshisa umxube. Ngokusebenzisa ukukhutshelwa phakathi electrode ukuvelisa iintlantsi, injini yepetroli ngokusebenzisa amafutha kunye negesi umxube ukutsha ngexesha kwangethuba ukuvelisa amandla, kodwa njengoko ipetroli yepetroli nakwindawo yobushushu obuphezulu kunzima ukutsha okuzenzekelayo, ukwenzela ukuba ukutsha kwayo ngexesha elifanelekileyo kuyimfuneko ukusebenzisa "umlilo" ukuvutha. Apha ukuvutha kwentlantsi ngumsebenzi we "spark plug".
