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Q: Where Is the Spark Plug Usually Located?

A: Spark plugs are a key part of the ignition system. They’re electrical devices that ignite the air-fuel mixture inside the cylinder’s combustion chamber. Because they use high voltage and generate hot electrical sparks, they wear out quickly and require replacement.

image showing the location of a spark plug
In a four-cylinder engine, the spark plugs are found on either the engine’s top or the side in a row.

The location of the spark plugs can vary depending on the number of cylinders in the engine. In a four-cylinder engine, the plugs are found on either the engine’s top or the side in a row. If we’re talking about an inline six-cylinder engine, the plugs are on the top or the side of the engine head. Finally, the spark plugs of V6 and V8-cylinder engines are usually divided evenly across either side.

Many Subaru models position their spark plugs on the side of their engine. This also applies to Porsche models equipped with a flat-four or a flat-six engine.

Tips On How to Access the Spark Plug

When you open the hood, look for the spark plugs on the engine. Each spark plug has either an ignition coil or a wire leading to the coil. Modern vehicles usually have an ignition coil pack for each cylinder, while older vehicles have only a single coil pack shared between its cylinders. If the spark plug has an ignition coil pack, unbolt the coil pack to reveal the plug’s top. But if the plug has a wire, carefully tug the wire.

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Use a clean rag or compressed air to clean the spark plug. Next, loosen the spark plug with a socket. If the plug stays stuck, use a ratchet to loosen it.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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