causes misfiring. 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. During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. Running the recommended spark plug. "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. I would check the following: 1)Fuel pressure regulator if all 4 plugs are fouling up immediately. The structure of the ash is loose to cinder-like. I have notice that my spark plug is fully covered in deep heavy thick black carbon soot. A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. Could it be a air/fuel mixture problem? walls and cause it to go to using oil. The motor, which was completely rebuilt six years ago, is a 327 V-8. I have bumped up the heat range and installed a fresh new air filter, changed the oil, but same problem. Is it the oil? 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. If its just 1 plug that fouls up I'd check for a faulty fuel injector. Runs good cold and after 3 minutes won't do much at all. Re: Black, carboned spark plug first ,i would try running a hotter plug, to see if that helped burn of the deposits. I haven't done a thing with the carb jetting, I figured it shouldn't be … 3)Check the operation of the primary O2 Sensor. Here we are going to focus on some keystone points that make spark plugs black. Once the issue has been rectified the old spark plugs must be removed and new ones installed. 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. It burns up a set of spark plugs in less than a week. Black carbon on the spark plugs is usually caused by a very rich mixture of fuel. Black plugs are a sure sign of running rich not oil, or dust as mentioned above. 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. If this isn't cured it will wash down the cyl. Has new carb., fuel filters, fuel lines, cleaned tank, new gas, new air filter, new exciter and ignition coils. This can lead your spark to black. The gas? or the coolant? All of the burned plugs are black with soot and they all look the same. Cause… 2)Check the MAF sensor if the car has one. Cause every spark plugs have a limited lifespan and turn black over time. 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