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Originally Posted by Queppa
Pinging is the noise of the pistons slapping the side of the bores in the motor. it is also called pre-ignition.
You get hot spots on the pistons that causes the fuel to ignite before the spark plug intends it too and so you get a double explosion which causes the piston to be pushed in different directions. When the pinging gets bad, thats when the engine pops (or backfires if you prefer).
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Not all backfiring is caused by pinging of course though right >
Eric.