preignition
/ˌpriːɪɡˈnɪʃən/
noun
- The premature ignition of fuel in an internal combustion engine, occurring before the spark plug fires.
- The mechanic diagnosed the engine knock as a case of preignition caused by carbon deposits.
- Using fuel with too low an octane rating increases the risk of preignition.
- Preignition can damage pistons and reduce engine efficiency.