[Wikipedia](https://en.wikipedia.org/wiki/Engine_knocking) isn’t clear, seeming to say they’re synonymous, then later implying they’re not.
What’s the difference, if any, between the two?
In: 3
The normal operation of an engine involves fuel and air being mixed, compressed by the cylinder, then detonated at a certain point by a spark plug in order to push the cylinder down.
Compressing the fuel and air causes it to heat up. If things go wrong it can detonate on its own before the spark plug triggers it, causing a problem called “knocking”.
In both cases the fuel and air mixture detonates, but with knocking it isn’t triggered by the spark plug and it happens at the wrong time.
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