Complete Guide to Spark Plugs: When and How to Replace Them

Spark plugs are small but mighty components that play a critical role in your engine performance. Worn or faulty spark plugs can cause misfires, poor fuel economy, and rough idling. Knowing when and how to replace them can save you money and keep your engine running smoothly.Signs You Need New Spark PlugsCommon symptoms include engine misfires, difficulty starting, reduced fuel economy, rough idling, and poor acceleration. If you notice any of these issues, inspect your spark plugs as a first step.Types of Spark PlugsCopper Spark Plugs: Most affordable with excellent conductivity but shorter lifespan (20,000-30,000 miles). Best for older vehicles.Platinum Spark Plugs: Longer lasting (60,000 miles) with better performance. A popular choice for modern daily drivers.Iridium Spark Plugs: Premium option with the longest lifespan (100,000+ miles) and superior ignitability. Ideal for high-performance and late-model vehicles.How Often Should You Replace Spark Plugs?Most manufacturers recommend replacement every 30,000 to 100,000 miles depending on plug type. Check your owner manual for the specific interval. At Gear Forge, we offer a wide selection of spark plugs to fit every engine type and budget.