noun
- plural of preignition; instances of fuel igniting in an engine before the spark plug fires
Usage: automotive; technical
Examples
- The mechanic diagnosed multiple preignitions causing the engine knock.
- High compression ratios can lead to preignitions in older engines.
- The fuel additive helped prevent preignitions during hot weather.
- Preignitions were causing significant power loss in the race car.
- Carbon deposits often trigger preignitions in high-mileage vehicles.