![]() ![]() How do you know if your spark plugs need to be changed? There are several signs to keep a lookout for, including hard starting, engine misfiring, poor fuel economy, poor acceleration, or vibrations when idling. Usually, they need to be changed out every 30,000 miles. However, like all automotive components, spark plugs have a shelf life. Then, after the vehicle is started, the spark plugs still play a role in keeping the air-fuel mixture ignited. They work to ignite the fuel-air mixture in the engine cylinders to essentially ensure the vehicle's engine can turn over properly. Spark plugs are some of the simplest, yet most important, components of the engine.
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