ama-spark plug, ngokuvamile aziwa ngokuthi ama-fire plugs, azosebenza njenge-pulse of high-voltage piezoelectric discharge esuka kumthofu onamandla kagesi (ipulaki lomlilo), elizophula umoya phakathi kwama-electrode ama-spark plug, akhiqize izinhlansi zikagesi ukuze zivutha. ingxube yegesi kusilinda. Izimo eziyisisekelo zenjini yokusebenza okuphezulu: inhlansi yamandla aphezulu, ingxube efanayo, isilinganiso sokucindezela okuphezulu. Izimoto ezinezinjini ezivuthayo zangaphakathi ngokuvamile zisebenzisa uphethiloli nodizili. Emakethe yezimoto yaseChina, izimoto zikaphethiloli zithatha ingxenye enkulu. Izinjini zikaphethiloli zihlukile ezinjinini zikadizili ngoba uphethiloli unendawo yokuthungela ephakeme (cishe amadigri angu-400), okudinga ukuthungela ngenkani ukuze kuthungele ingxube. Ngokusebenzisa ukukhishwa phakathi kwama-electrode ukukhiqiza izinhlansi, injini kaphethiloli ngokusebenzisa ingxube kaphethiloli negesi ukuvutha okufika ngesikhathi ukukhiqiza amandla, kepha njengoba uphethiloli uphethiloli ngisho nasendaweni yokushisa ephezulu kunzima ukuvutha okuzenzakalelayo, ukuze wenze ukuvutha kwawo okufika ngesikhathi kudingekile ukusebenzisa "umlilo" ukuvutha. Lapha ukudubula kwenhlansi kuwumsebenzi we-"spark plug".
