Rough idling and loud engine noises: When a spark plug isn't working, the corresponding cylinder on the engine fails to function properly, too.This is a telltale sign of spark plug failure. Weakening engine performance: A knock-on effect of misfires, acceleration and overall performance will suffer if any of the cylinders fail to ignite its fuel mixture.You may even hear a popping sound or notice that the engine suddenly loses power for a second before catching again. However, a faulty spark plug can certainly cause a misfire. The engine misfires: Since there are multiple possible causes for a misfire, this is a less clear-cut symptom.Sometimes the spark plugs themselves are the issue, being worn down or clogged and not able to produce that essential spark. Ignition coils provide the charge for the spark plugs, and when an ignition coil fails, the spark plug won't be able to start the combustion process.
The car struggles to start: This is a very obvious sign.To help you avoid this, here are the symptoms of a bad spark plug to keep an eye out for: It can also negatively affect things like fuel economy or even damage your engine, leading to far more expensive repairs. A faulty spark plug can have a serious impact on the running of your vehicle, and it may even lead to decreased performance.
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