Spark Plug Maintenance 

Spark plugs are an essential element of the combustion process. These components ignite the air-fuel mixture in your engine, allowing the vehicle to create power. Though many spark plugs are highly durable, they do need to be replaced every so often. If left unattended, they can affect performance, fuel economy, and more. 

Performance and Fuel Economy

When spark plugs fail to perform properly, a vehicle can lose power and efficiency. As these components get older, the engine may begin to misfire (operate out of sync). This leads to lower efficiency and a loss of power overall. Old spark plugs also require more fuel in order to start the combustion process, creating a fuel-rich mixture-an issue that can worsen over time. Replacing spark plugs ensures that your engine is always working properly.

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Subaru of Naples

1411 Solana Rd
Directions Naples, FL 34103

  • Sales: (239) 649-1400
  • Service: (866) 971-0301
  • Parts: (866) 981-1806


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Not only does lower efficiency mean you have to use more gas in order to power your car, but it also leads to harmful emissions. A fuel-rich mixture leads to added buildup in the engine and more CO2 and other chemicals in the exhaust. If you wait to change your spark plugs, you may end up with additional carbon emissions.

Wear and Tear

Old spark plugs can also affect other systems, leading to more breakdowns in the future. For example, added emissions force the catalytic convertor and O2 sensors to work harder. Misfires can throw your engine out of sync, and you may also have issues with the electrical system if your old plugs leak voltage into other parts of the engine. 

When should you get new spark plugs? It depends on the plugs you use. Some spark plugs last up to 100,000 miles; however, the average plugs should be replaced every 30,000 miles. Think you might need new spark plugs? Stop by DeVoe Subaru today. Our friendly service team will be happy to help diagnose and recommend any service your vehicle may need! Visit us near Bonita Springs, Cape Coral, and Fort Myers!