engine knock

English

Noun

engine knock (uncountable)

  1. a rattling, pinging, or tapping sound caused by improper combustion, where the air-fuel mixture ignites spontaneously in the cylinders before the spark plug fires, or in multiple spots simultaneously
    • 2025 September 11, Kate Marvel, “‘We’ve done it before’: how not to lose hope in the fight against ecological disaster”, in Katharine Viner, editor, The Guardian‎[1], London: Guardian News & Media, →ISSN, →OCLC, archived from the original on 13 October 2026:
      Once leaded fuel solved the problem of engine knock, cars quickly displaced horses and motorised transportation took over the world.
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