The gas? All of the burned plugs are black with soot and they all look the same. The structure of the ash is loose to cinder-like. The motor, which was completely rebuilt six years ago, is a 327 V-8. Here we are going to focus on some keystone points that make spark plugs black. The most common issue could be if your spark plugs are old enough and have carbon buildup on them the way may not be able to fully burn the fuel mixture. Black plugs are a sure sign of running rich not oil, or dust as mentioned above. Runs good cold and after 3 minutes won't do much at all. Is it the oil? kdot em3 Once the issue has been rectified the old spark plugs must be removed and new ones installed. A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. I would check the following: 1)Fuel pressure regulator if all 4 plugs are fouling up immediately. causes misfiring. Running the recommended spark plug. Burning to much fuel will cause the spark plug to carbon foul causing the engine to stop running. Re: Black, carboned spark plug first ,i would try running a hotter plug, to see if that helped burn of the deposits. If this isn't cured it will wash down the cyl. Cause… A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. Excess carbon build up can cause the EGR valve to stick open allowing intake pressures to drop and the engine to stall at idle and run rough. walls and cause it to go to using oil. Carbon Fouling If the spark plugs have a matte black or grey appearance, it could be carbon fouling — something typically caused by a fuel mixture that is too rich. During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. Spark plugs can be the “canary in the coal mine” for underlying engine issues. If it is in a heavy enough concentration, the soot can cause a loss in power or misfiring through a weakened spark or a spark that jumps incorrectly. I have notice that my spark plug is fully covered in deep heavy thick black carbon soot. 3)Check the operation of the primary O2 Sensor. I have bumped up the heat range and installed a fresh new air filter, changed the oil, but same problem. It burns up a set of spark plugs in less than a week. second, i would replace the jet to one level back "Sooty" is defined as a black, somewhat powdery stuff (carbon deposits) that covers the center and side electrodes and the center porcelain of the spark plug. Pronounced lead fouling Heavy ash deposits on the insulator nose resulting from oil and fuel additives, in the scavening area and on the ground electrode. If its just 1 plug that fouls up I'd check for a faulty fuel injector. Has new carb., fuel filters, fuel lines, cleaned tank, new gas, new air filter, new exciter and ignition coils. 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