a) excess lubricants in cylinder
b) gum in fuel
c) over-heated spark plug
d) higher volume of air in air fuel mixture
Answer: c
Explanation: Pre-ignition is a condition or situation in which the fuel and air mixture in spark plugin ignites before the timed spark and this can happen due to contact with hot surface. So, if the spark plug is over heated or its tip is too hot, it can result in pre-ignition.
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