How Often Do You Need to Replace Spark Plugs?


Spark plugs screw into the cylinder of your engine and connect to the ignition system. Electricity from the ignition system flows through the plug and creates a spark. This ignites with the fuel-and-air mixture in the cylinder to create an explosion and power the engine. Spark plugs are important for starting the car, but they must also continue to fire at set intervals to keep the engine going. When spark plugs wear out, they don't fire at the proper times and don't work as they should. Fortunately, spark plugs are durable and last for thousands of miles before they need maintenance. If you're having trouble determining if it's time to replace your spark plugs, use these guidelines to help.