![]() ![]() This light usually comes on when your engine has running issues due to a bad spark plug, oil contamination, or overheating. The check engine light illumination is one of the clear symptoms of a faulty spark plug. Smell from the exhaust system 1) Check Engine Light Illumination.The following are the most common symptoms of a faulty or clogged spark plug: When the spark plug goes bad, it produces different symptoms such as poor acceleration, engine stalling, poor fuel economy, misfiring, engine knocking, or hard starting issues. The efficient working of the spark plug is very important to ensure the optimum performance of a gasoline engine. The center electrode protrudes into the combustor through a porcelain insulator. It also connects to the cylinder head of the engine. The metal shell of the spark plug is electrically grounded. It connects to the output terminals of the magneto or ignition coil through a highly insulated wire. This central electrode usually contains a resistor. ![]() The ceramic insulator is used to insulate the shell from the central electrode electrically. Therefore, diesel engines don’t require spark plugs to ignite the air-fuel mixture. However, in diesel engines, combustion of the air-fuel mixture occurs due to high compression of the air. Spark plugs are most commonly used for gasoline engines. What is a Spark Plug?Ī spark plug is a mechanical device that generates an electric spark to ignite the compressed fuel-air mixture inside the combustion chamber. This article explains the bad spark plug symptoms, causes, working, and its replacement cost. As the spark plugs go bad, they produce different signs. For the efficient working of the engine, your spark plug must work efficiently. The spark plug is usually used in petrol engines. It contains multiple parts, and the spark plug is one of them. The engine is one of the most important parts of the vehicle. Why do diesel engines not have a spark plug?.How to check a spark plug without removing it?.What are the components of the spark plug?.How often do spark plugs need to be replaced?.What is the function of the spark plug?.
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