How to Replace the Ignition Coil and Spark Plugs in an Older Car

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An ignition coil is a crucial component of a car's ignition system, responsible for creating the spark needed to ignite the fuel in the engine cylinders. If you notice any signs of a faulty ignition coil, such as engine misfires or difficulty starting the car, it's important to address the issue promptly to avoid further damage to the ignition system and other components.

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The coil is the part of a car's ignition system that takes the battery's 12-volt output (called low-tension current) and transforms it into as much as 45,000 volts (called high-tension current) before then supplying it to the engine's spark plugs. It is typically just a wire-wound transformer filled with an insulator. Why does an engine need one?

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All ignition systems for modern petrol engines use ignition coils for the same basic function: to create the high voltage required to produce a spark at the spark plug. Aftermarket professionals will be familiar with their purpose and basic attributes - but they may not know about the in-depth scientific principles they rely on.

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A modern ignition coil just looks like a rubber boot that slips onto its spark plug. BLKstudio/Shutterstock The ignition coil can be found on practically every gasoline-powered internal combustion engine vehicle on the market. In fact, your car probably has several of them — one for each engine cylinder.

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Go to step 1 This guide will show you how to fix a misfire or rough idle on your vehicle to ensure and prolong the life of your vehicle's engine. This guide will include: Removing the plastic engine cover Removing and installing new ignition/coil pack Removing old spark plugs Gapping and installing new spark plugs What you need Parts

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1. Check Engine Light Bad ignition coils usually cause the Check Engine Light to come on. If you use your compatible code scanner, you may see a P0300 - P0312 ignition code or something manufacturer-specific. You may also get a generic engine misfire code.

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If none of the cylinders receive spark from a spark plug because of a bad ignition coil, the car might crank but fail to start. The Engine Stalls. Like most electrical devices, ignition coils can experience intermittent problems. When this happens, the engine may stall unexpectedly. Stalling mostly happens to engines with just one ignition coil.

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The ignition coil transforms the battery's voltage to a level that allows the spark plug to do its job. Older vehicles have a distributor, ignition coil, and spark plug wires. Most vehicles made after the late 1990s typically have a small ignition coil that sits directly on top of each spark plug, which is known as coil-on-plug (COP) design.

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Ignition coils manage your spark plugs and are critical for engine performance. And when they fail, your car may feel sluggish or your check engine light mig.

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An ignition coil is used in the ignition system of a spark-ignition engine to transform the battery voltage to the much higher voltages required to operate the spark plug (s). The spark plugs then use this burst of high-voltage electricity to ignite the air-fuel mixture.

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An ignition coil is an electromagnetic induction-type transformer that turns low electrical voltage from the battery into high voltage provided to the spark plug, which then sparks and ignites.

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That final step of a spark plug igniting the air-fuel mixture that's compressed in the cylinder hinges on an ignition coil delivering an electric current to the spark plug. If you have a faulty coil, it's going to cost you between $200 and $300 on average to replace it, not to mention the frustration and downtime you'll experience.

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An ignition coil is an inductive coil that is a part of the vehicle's secondary ignition system. It uses electromagnetic induction to convert the vehicle's twelve volts into the several thousands of volts required to create a spark powerful enough to jump across the spark plug gap.

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What is a coil? It's the part of a car's ignition system that takes the battery's 12-volt output (called low-tension current) and transforms it into as much as 45,000 volts (called high-tension current) before then supplying it to the engine's spark plugs. Why does an engine need one?