I have bumped up the heat range and installed a fresh new air filter, changed the oil, but same problem. I haven't done a thing with the carb jetting, I figured it shouldn't be … Black plugs are a sure sign of running rich not oil, or dust as mentioned above. Cause every spark plugs have a limited lifespan and turn black over time. During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. Has new carb., fuel filters, fuel lines, cleaned tank, new gas, new air filter, new exciter and ignition coils. Runs good cold and after 3 minutes won't do much at all. 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. "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. A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. This can lead your spark to black. Here we are going to focus on some keystone points that make spark plugs black. Causes may include a stuck choke, misadjusted or heavy carburetor float, a leaky injector or carburetor needle valve, low coil output or high resistance in your spark plug wires. The motor, which was completely rebuilt six years ago, is a 327 V-8. 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. Could it be a air/fuel mixture problem? Spark plugs can be the “canary in the coal mine” for underlying engine issues. causes misfiring. If its just 1 plug that fouls up I'd check for a faulty fuel injector. Black carbon on the spark plugs is usually caused by a very rich mixture of fuel. 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. Burning to much fuel will cause the spark plug to carbon foul causing the engine to stop running. I have notice that my spark plug is fully covered in deep heavy thick black carbon soot. Running the recommended spark plug. Is it the oil? It burns up a set of spark plugs in less than a week. 2)Check the MAF sensor if the car has one. 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. or the coolant? kdot em3 Once the issue has been rectified the old spark plugs must be removed and new ones installed. The structure of the ash is loose to cinder-like. Remedy: Replace with new spark plugs. 84 gas club car has constant carbon (dry) fouled plug. 3)Check the operation of the primary O2 Sensor. 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