This fouling indicates advanced engine wear. Oil fouling: A black oily spark plug with oil deposits.When this happens, you will experience engine misfire. The carbon based deposits you see on the plug may be conductive, and will allow the voltage coming out of the electrode to travel down the plug instead of jumping the gap. Carbon fouling: Your spark plug will have a black look, and will have soot build up deposits indicating a rich fuel/air mixture, another cause may be from, weak ignition.Here are some of the most common reasons for spark plug fouling: Every spark plug can foul, no matter how expensive or how good they are. Although these are two reasons for spark plug fouling, there are other issues you should consider. Generally, most people will associate fouled spark plugs with gas and oil. Though the spark plug and spark plug wire manufacturers have been coming up with new technologies to retard the effects of EMI or RFI, the people who design the cars, trucks, SUVs and vans we drive everyday are working hard to help with the effects of EMI or RFI. But the EMI or the RFI can also cause more severe problems with your vehicles computer or radio, or other vehicle electronic or electrical systems. When a spark moves or jumps the gap on the spark plug, it creates electromagnetic field causing a number of problems, such as poor spark plug performance. These unwanted signals interfere with other signals sent from other electric or electronic signals. With the spark plug and spark plug wires, this is extremely minute amounts of radiation that are emitted by electric circuits which carry rapidly changing signals. Instead, the resistors were created for EMI (electromagnetic interference) or RFI (radio frequency interference). Some think that the resistor will stop oil fouling or may stop the deposits from entering or exiting the spark plug chamber. Many people have this misconception about spark plug resistors.
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