If this isn't cured it will wash down the cyl. second, i would replace the jet to one level back Re: Black, carboned spark plug first ,i would try running a hotter plug, to see if that helped burn of the deposits. Has new carb., fuel filters, fuel lines, cleaned tank, new gas, new air filter, new exciter and ignition coils. "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. 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. 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. Once the issue has been rectified the old spark plugs must be removed and new ones installed. Runs good cold and after 3 minutes won't do much at all. This can lead your spark to black. I have bumped up the heat range and installed a fresh new air filter, changed the oil, but same problem. 3)Check the operation of the primary O2 Sensor. It burns up a set of spark plugs in less than a week. The gas? I haven't done a thing with the carb jetting, I figured it shouldn't be … During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. 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. kdot em3 A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. Remedy: Replace with new spark plugs. or the coolant? Is it the oil? Could it be a air/fuel mixture problem? The motor, which was completely rebuilt six years ago, is a 327 V-8. 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. Running the recommended spark plug. I have notice that my spark plug is fully covered in deep heavy thick black carbon soot. Here we are going to focus on some keystone points that make spark plugs black. Burning to much fuel will cause the spark plug to carbon foul causing the engine to stop running. I would check the following: 1)Fuel pressure regulator if all 4 plugs are fouling up immediately. Cause… If its just 1 plug that fouls up I'd check for a faulty fuel injector. 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. causes misfiring. Cause every spark plugs have a limited lifespan and turn black over time. The structure of the ash is loose to cinder-like. 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