mis·fire 
(mĭs-fīr)
(mĭs-fīr)intr.v. mis·fired, mis·fir·ing, mis·fires
1. To fail to ignite when expected. Used of an internal-combustion engine.
2. To fail to discharge. Used of a firearm.
3. To fail to achieve an anticipated result: a scheme that misfired.
misfire′ (mĭsfīr′, mĭs-fīr) n.