Discussion
Match each plug appearance with its cause.
List I
A. White blistered insulator
B. Dry black soot
C. Wet oily film
List II
P. rich mixture or too cold a plug
Q. overheating or too hot a plug
R. oil reaching the combustion chamber
Select the correct match.
Answer: B
Blistering means too hot, dry soot means too rich or too cold, and a wet film means oil is getting past the rings or the valve stem seals. Reading plugs remains a quick and useful diagnostic. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.
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