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Without the proper knowledge and professional expertise, replacing your own spark plugs could cause serious damage to your engine. Spark plugs are difficult to access, and there may even be more than one spark plug per engine cylinder. It is not recommended to replace your own spark plugs at home. If your check engine light is flashing, it could mean the misfires are potentially causing severe damage to the engine, catalytic converter, and other important components. In this case, the check engine light typically comes on as a result of engine misfires caused by faulty spark plugs. Check Engine Light Is Flashingīad spark plugs are among the many potential causes for your check engine light to appear. If your spark plugs have stopped producing a spark altogether, you wont be able to start your car at all. A spark thats too weak wont ignite the fuel quickly enough, meaning you may have to crank the engine longer to create combustion. If your spark plugs are worn down, you may experience difficulty starting your car. Vibrations from engine misfires will be more noticeable when idling. An engine thats not firing properly on all cylinders will be off balance and shake excessively. Rough Idling & VibrationsĪ rough idle is often the result of your engine misfiring, possibly from failing spark plugs. Engine misfires are characterized by irregular sputtering and stumbling from the engine accompanied by a popping sound and overall loss of power. Similar to previous symptoms, if your engine is constantly misfiring, it could be that a damaged spark plug or spark plug wire is not properly igniting the air-fuel mixture. Whether its a faulty ignition coil, fuel injector, or spark plug, an engine thats misfiring is usually the result of a problem with the ignition system. If you notice a drop in your vehicles usual mileage per gallon, faulty spark plugs may be to blame. Inefficient combustion means your engine must work harder to produce power when you press on the gas pedal, resulting in greater fuel consumption. When that gap is either too small or too large, the spark wont properly ignite the air-fuel mixture in the combustion chamber. Poor Fuel Economyįor a spark plug to work properly, the gap between electrodes must be just right. Since spark plugs typically wear down at the same rate, the collective power reduction to your engine often results in a noticeable lack of acceleration while driving. This improper combustion leads to an underpowered engine. The electric arc from a spark plug must be hot enough to ignite the air-fuel mixture in the engine, but a bad spark may not properly ignite the mixture. As the conductive material in each spark plug degrades over time, its sparks will lose effectiveness. If you notice your Nissan feels sluggish and is noticeably slower when accelerating, you may be dealing with worn-out spark plugs.
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If youre unsure of the last time your spark plugs were replaced, these common signs of worn-out spark plugs may be good indicators that its time to replace yours.
#Signs of bad spark plugs manual
The exact interval will depend on the type of spark plugs in your vehicle, so check your owners manual for model-specific recommendations. Replace the spark plugs in your Nissan approximately every 100,000 miles.
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While this wear is normal and expected with a properly maintained engine, other factors such as overheating, oil contamination, and carbon buildup can cause spark plugs to fail prematurely. The electrodes on each spark plug slowly wear down until they cant produce a spark at all.
![signs of bad spark plugs signs of bad spark plugs](https://i.pinimg.com/originals/04/63/ad/0463adae1ce78cf0865d10641616f106.png)
Like most vehicle parts, spark plugs eventually need replacing.