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Causes of pre-ignition in a spark-ignition (petrol) engine: identify the correct cause(s). Pre-ignition is spontaneous ignition before normal spark timing at the end of the compression stroke. Choose the best option.

Difficulty: Easy

Cylinder walls too hot
Overheated spark-plug points
Red-hot carbon deposits on the walls
Any one of these (all are possible causes)

Correct Answer: Any one of these (all are possible causes)

Explanation:

Concept
Pre-ignition is triggered by local hot spots that ignite the mixture prematurely. Common hot spots include overheated plug electrodes, glowing carbon deposits, or excessively hot combustion-chamber surfaces.

Final Answer
Any one of these (all are possible causes).

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