![]() How Often Should You Replace Spark Plugs? If you don’t replace the spark plugs at the recommended intervals, you’re most likely going to suffer from a rougher idle and reduced fuel economy, but waiting too long could result in reduced reliability and even being stranded on the side of the road. Only in the most absolute worst-case scenario would an old spark plug create a safety issue or cause damage to your engine, but worn out spark plugs will definitely affect the performance of your engine. What Happens If You Don’t Replace Spark Plugs? The spark plugs on a 1997-2006 Jeep Wrangler are super easy to change out, but that isn’t the case with all cars/engines. Knowing how to replace spark plugs is basically the same across all types of engines, but this job tends to be easier on vehicles equipped with an inline engine rather than wider V-6 or V-8 engines. The spark plug screws into the cylinder and head, and they are connected using either plug wires or coil packs. ![]() It is extremely important that your vehicle’s spark plugs are functioning properly to maximize reliability and fuel efficiency, so be sure to replace spark plugs regularly. Most engines feature one spark plug per cylinder, but some newer, more advanced engines feature two spark plugs per cylinder. As the name suggests, the spark plug creates a spark in the combustion chamber to ignite the air/fuel mixture, which drives your engine. ![]() Spark plugs are as important to your engine as the gasoline in your tank. ![]() Brand new spark plug (left) versus old, worn out spark plug (right). ![]()
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