back·fire 
/ˈbækˌfajɚ/ verb
back·fires; back·fired; back·fir·ing /ˈbækˌfajɚ/ verb [no obj] 1 of an engine or vehicle : to make a loud sound when fuel is not burned properly
▪ The car backfired. 2 : to have the opposite result of what was desired or expected
▪ Our plans backfired (on us).
▪ The car backfired.
▪ Our plans backfired (on us).
— backfire noun, plural backfires [count]
▪ an engine backfire
▪ an engine backfire
