Ma spark plugs, omwe amadziwika kuti ma fire plugs, amagwira ntchito ngati pulse ya piezoelectric yotulutsa mphamvu zambiri kuchokera ku lead yamphamvu kwambiri (fire plug), yomwe idzaphwanya mpweya pakati pa ma electrode a ma spark plugs, ndikupanga ma sparks amagetsi kuti ayatse kusakaniza kwa gasi mu silinda. Zinthu zofunika kwambiri pa injini yogwira ntchito kwambiri: spark yokhazikika yamphamvu kwambiri, kusakaniza kofanana, ndi chiŵerengero chapamwamba cha kupsinjika. Magalimoto okhala ndi injini zoyaka mkati nthawi zambiri amagwiritsa ntchito mafuta a petulo ndi dizilo. Mumsika wamagalimoto ku China, magalimoto a petulo amakhala ndi gawo lalikulu. Mainjini a petulo ndi osiyana ndi mainjini a dizilo chifukwa mafuta ali ndi malo oyatsira moto apamwamba (pafupifupi madigiri 400), zomwe zimafuna kuyatsa kokakamiza kuti ayatse kusakaniza. Kudzera mu kuyatsa pakati pa ma electrode kuti apange ma sparks, injini ya petulo imayatsa moto nthawi yake kudzera mu mafuta ndi gasi kuti ipange mphamvu, koma popeza mafuta ngakhale kutentha kwambiri kumakhala kovuta kuyatsa mwadzidzidzi, kuti kuyatsa kwake kuchitike ndikofunikira kugwiritsa ntchito "moto" kuti ayatse. Apa kuyatsa moto ndi ntchito ya "spark plug".
