RAM 2500 Truck 2WD V8-5.9L VIN Z (1997)
Spark Plug: Testing and Inspection
Dry, Fluffy Black Deposits - Cold or Carbon Fouling
Normal Operation And Carbon Fouling
Cold fouling is sometimes referred to as carbon fouling. The deposits that cause cold fouling are basically carbon. A dry, black deposit on one or two
plugs in a set may be caused by sticking valves or defective spark plug cables. Cold (carbon) fouling of the entire set of spark plugs may be caused by a
clogged air filter or repeated short operating times (short trips).