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What Causes Spark Plugs to Foul?

Answer:

Worn internal engine components i.e. rings/valves allowing oil to get into combustion chamber at a greater rate than can be burned off by ignition in chamber

First answer by Baldfatguy. Last edit by Baldfatguy. Contributor trust: 2032 [recommend contributor ]. Question popularity: 3 [recommend question].

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