C 1500 Truck 2WD V8-4.8L VIN V (2001)
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Normal operation-Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with
additives.
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Carbon Fouled-Dry, fluffy black carbon, or soot caused by the following conditions:
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Rich fuel mixtures
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Leaking fuel injectors
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Excessive fuel pressure
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Restricted air filter element
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Incorrect combustion
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Reduced ignition system voltage output
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Weak coils
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Worn ignition wires
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Incorrect spark plug gap
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Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off.
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Deposit Fouling-Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark intensity. Most powdery
deposits will not effect spark intensity unless they form into a glazing over the electrode.