There is should also be a lack of engine power and some truly horrible knocking sounds. When this is the case, oil on the spark plugs is almost never the only indication of the problem. If these rings begin to fail, it can lead to oil on the spark plugs.īad Piston– If the piston runs too long hot, it can develop a crack. This keeps oil from entering the combustion chamber. Piston Rings– Piston rings surround your piston and fill the already tiny space between the piston and the cylinder wall. If this ring dries out or fails over time, it will begin to allow oil to drip onto the plug. O-Ring– On most overhead cam designs, there is an O-Ring that protects the spark plug from oil from above. While, the combustion process can burn off a lot of this oil, eventually it’ll hurt the plug and it’ll get oily. When this happens, oil can get directly into the combustion chamber. Valve Guides– As an engine wears throughout its life, the valve guides can go bad. When this happens oil can leak out of the engine and into the spark plug wells. As they age, they can dry out and go bad. They are there for you to have access to the head. The valve cover gaskets seal the valve covers, which are on top of the head. Here are the most common symptoms of oil on spark plugs:īad Valve Cover Gasket– Oil is pumped from the oil pan up through your Fiesta’s cylinder heads. Most of the time, oil on your spark plugs is going to be caused by a bad O-ring seal on the plug itself or a bad valve cover gasket. Blue Exhaust Smoke– When a spark plug is burning oil, there will be a blue tint to the exhaust.If the check engine light is flashing, driving your Fiesta could cause permanent damage if it’s not fixed. If the service engine soon light is flashing, this indicates that the ECM reads that this could be happening. Catalytic Converter Damage– Fuel that is not properly combusted will leave behind gasses that can and will hurt the catalytic converter.It may not be a lot at first, but it will get worse as the plug gets worse. Decreased Fuel Mileage– With the fuel burning less efficiently, mileage will suffer.Eventually, if the engine misfires enough, it can lead to a backfire. ![]() Or, you’ll get P0300 if you have a random cylinder misfire. It’ll likely show a P030X trouble code, where the X represents that cylinder number in the firing order. Misfire– The number one indicator that there is oil on the spark plug is a misfire.This is good news, since you can use the trouble codes it throws to diagnose the problem. Check Engine Light– The service engine soon light will often be on.Here are the most common symptoms of an oily plug: When there is oil on the spark plug, it’s going to make combustion in its respective cylinder less efficient. ![]() If you do end up with oil on your spark plugs, you’re going to need to consider replacing them. An oily spark plug can cause the spark plug to not fire properly. The spark plugs are the final stop in the ignition system’s process. The ignition system takes care of the spark part of the combustion equation. When any of these three necessary elements is off, your Fiesta’s engine will not perform as it should. There can be other causes as well.Īny gas engine needs three things in order to achieve combustion. When there is oil on the spark plugs is usually caused by a bad valve cover gasket or O-Ring (overhead cam engines). It doesn’t necessarily indicate a major engine problem. If you’ve found oil on your Ford Fiesta’s spark plug, it should be a cause for concern.
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