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. walls and cause it to go to using oil. This can lead your spark to black. 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. I would check the following: 1)Fuel pressure regulator if all 4 plugs are fouling up immediately. The gas? 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. Running the recommended spark plug. Remedy: Replace with new spark plugs. Once the issue has been rectified the old spark plugs must be removed and new ones installed. 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. or the coolant? Could it be a air/fuel mixture problem? During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. The structure of the ash is loose to cinder-like. Black plugs are a sure sign of running rich not oil, or dust as mentioned above. I have notice that my spark plug is fully covered in deep heavy thick black carbon soot. second, i would replace the jet to one level back 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. Re: Black, carboned spark plug first ,i would try running a hotter plug, to see if that helped burn of the deposits. The motor, which was completely rebuilt six years ago, is a 327 V-8. If this isn't cured it will wash down the cyl. Runs good cold and after 3 minutes won't do much at all. Cause every spark plugs have a limited lifespan and turn black over time. I have bumped up the heat range and installed a fresh new air filter, changed the oil, but same problem. A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. Spark plugs can be the “canary in the coal mine” for underlying engine issues. Is it the oil? All of the burned plugs are black with soot and they all look the same. Cause… Burning to much fuel will cause the spark plug to carbon foul causing the engine to stop running. 3)Check the operation of the primary O2 Sensor. It burns up a set of spark plugs in less than a week. 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. 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. Has new carb., fuel filters, fuel lines, cleaned tank, new gas, new air filter, new exciter and ignition coils. A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. I haven't done a thing with the carb jetting, I figured it shouldn't be … "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. Here we are going to focus on some keystone points that make spark plugs black. causes misfiring. 84 gas club car has constant carbon (dry) fouled plug. 2)Check the MAF sensor if the car has one. kdot em3 That fouls up i 'd check for a faulty fuel injector its just 1 plug that up... Plug that fouls up i 'd check for a faulty fuel injector most of the burned plugs are with! Filter, changed the oil, or dust as mentioned above fouled plug have notice that my plug. 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