Lead Fouling. Appearance & Symptoms: Lead fouling can only occur in applications that use leaded gasoline, such as racing engines. Lead fouling generally shows up as yellowish brown deposits on the spark plug's insulator nose. Lead fouling can cause your engine to misfire only at high-rpm and under hard acceleration.. If only one or a few spark plugs have white tips, it may indicate a specific problem in those cylinders, such as a faulty fuel injector or intake manifold gasket. Using a Spark Plug Reading Chart. Using a spark plug reading chart is a helpful tool in diagnosing white spark plug tips. These charts provide a visual reference to compare the color.

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A faulty fuel injector can disrupt fuel delivery, causing an imbalanced air-fuel mixture and incomplete combustion. This is visible as a white spark plug tip. A lean mixture can cause decreased engine power, rough idling, and increased emissions. It can also make the engine run hotter, potentially causing overheating and damage.. 5 Reasons Why Your Spark Plugs Have White Stuff on Them. There are five main issues that can leave white residue on your spark plugs: Coolant leaks burning onto the ceramic tip. Oil leaking into the combustion chamber. Gasoline additives breaking down into mineral deposits. Severe knock/detonation damage.