Signs of a bad spark plug include misfiring if your vehicle has difficulty starting, a rough or loud idle, reduced fuel economy, trouble starting your car or accelerating, an illuminated Check Engine light, and more. This damage can affect your vehicle's ability to ignite the fuel mixture and prevent you from starting your vehicle or running the engine. A non-working spark plug can also be caused by a failing ignition coil, spark plug wire or boot, or a damaged connection from constant heat and long-term use. Spark plugs may also be fouled by overly-rich fuel mixtures or oil contamination, which can cause engine misfires and allow the spark plug to only operate intermittently. Additionally, pre-combustion can cause the spark plug electrodes to fail prematurely. If the spark plug electrode wears down too far, the gap may become too wide for electricity to arc, resulting in a weak spark or a complete lack of spark, and an engine that will not start. Although they're designed for lasting performance - around 80 to 100 thousand miles - spark plugs wear out over time as the electrode material degrades. Without healthy spark plugs, your car will not start or move or may experience a loss in performance or efficiency. The spark plugs on your car consist of a center electrode that receives power, and a ground electrode that completes the circuit to arc, making a spark. Spark plugs receive power from the distributor and/or ignition coil(s) that they use to create the spark needed for combustion, and are crucial to starting and your vehicle's engine.
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