Late ignition and rich fuel-air mixture can cause the engine to have problems when starting, especially because of ignition failures, the electronic control unit ECU will signal the P error. Other signs will be that the engine will not as smooth and vibrations especially at idle.
Sometimes you can find oil deposits on the spark plugs. This can happen because of engine misfires, difficult engine start, black smoke from the exhaust, and engine vibrations.
Oil can enter the combustion chamber through piston rings which is not good because it can indicates problems with the engine. Also, oil can enter in the combustion chamber through worn out engine valve oil seals and this problem can be resolved by replacing the seals. Carbon deposits form naturally in the combustion chamber and, at high engine speeds, they can come off the piston and stick to the spark plug insulator.
Being due to engine misfire, a natural cause, the easy fix is to simply change the spark plugs. Checking the spark plugs with carbon deposits or black soot on it can save you from having bigger issues with the ignition system over time. Overheating is especially bad, because it causes the probability of failure of the electrodes on the spark plugs without the capability of their recovery.
If only one blackened spark plug has appeared in your car, you can detect the failure by changing the position of the spark plugs. If the new spark plug also turns black after that, and the old one becomes clean, it means that the problem is not in the spark plugs, but in the cylinder.
If nothing has changed, the question then is the performance of the spark plug. In some cases, spark plugs can be wet and black. The most common cause of this fact is the oil pumping. Additional signs of this fault are as follows:.
Oil can get into the combustion chamber in two ways, i. In the first case, it gets through the piston rings. And this is a very bad sign, because it often results in the engine overhaul. In rare cases, you can carry out decarbonation of the engine.
If the oil gets into the combustion chamber through the top, it goes from the cylinder head along the valve guides. The reason for this is the wear of the valve oil seals. To eliminate this problem, it is necessary to replace the seals. In some cases, sooting that naturally appears in the combustion chamber can come off the piston and stick to the spark plug insulator at high engine speeds.
The consequence of this is engine misfire. This is the most harmless situation, when spark plugs blacken. You can fix it by cleaning their surface or replacing them with new ones. If black and red spark plugs have appeared in your engine, it means that you fuel up the car with an excess of additives with metals.
Such fuel cannot be used for a long time because metallic deposits form a conductive soot on the surface of the plug insulator over time. Sparking will be worse and the spark plugs will soon fail. If your spark plugs are fouled or damaged, it can lead to a host of problems including reduced gas mileage, slow acceleration, engine misfires and trouble starting the engine.
If you are experiencing engine problems, taking a look at your spark plugs is a good place to start. When reading spark plugs, you will likely find one of the following conditions:. You can do this as part of the routine maintenance of your car, ATV, lawnmower or boat, or if you suspect something is wrong with the engine. The first step is removing the spark plug you want to look at.
Follow these instructions on how to remove a spark plug. Take the spark plug in your hand and begin looking at it for signs of damage. Look at end of the spark plug that was in the cylinder and examine it. You will likely see one of the following conditions. A normal spark plug will have brown or grayish-tan deposits on the side electrode. Everything is just fine with your spark plug; you can reinstall the spark plug. Black, dry soot on the electrodes and insulator tip indicates a carbon-fouled plug.
Black, oily deposits on the electrodes and insulator tip points to an oil-fouled plug. Oil could be leaking into the cylinders, getting past pistons that are worn or valve guides that are worn. Finding the source of the leak is very important — consult a mechanic for guidance.
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