This is arguably one of the easier DIY car maintenance jobs. Ideally, use a torque wrench to ensure you meet factory torque numbers.Īnd you’re all set. It is usually easiest to thread them in with just the extension and socket, then attach the ratchet to tighten. When the gaps are correct, you can install the plugs.If you’re in a pinch, you can also gap your spark plugs without a tool. Most plugs come pre-gapped, but it’s best to refer to your service manual for proper gap specifications, using use a spark plug gap gauge to make sure the gap is right. Be sure to check for any oil leaks or contaminants present in the plug wells, as they can be indicative of other issues you need to address. Feel free to use carb cleaner, turbo cleaner, or EGR valve cleaner. You might want to take the time to clean around the engine bay as well as in the spark plug wells at this point.Uninstall all spark plugs using an extension bar.You should then be able to wiggle the coil free by pulling it up. There is usually a bolt holding the coil in place. How much you have to remove from your engine bay in order to get started will vary as noted above, but once you have things removed, you can start with your ignition coils. Others might require more in-depth removal of parts, meaning you need a full automotive tool set to get the job done. You can use a regular socket, but spark plug sockets include a rubber boot (or even magnet) to hold the spark plug in place and make them easier to remove and install.Įngine bay designs vary, though, so you might have to take more apart to access your spark plugs than others.įor instance, on some vehicles you can just pop the hood and see where the plugs are and even start working without having to remove anything else. You will at a minimum need a ratchet and extension bar (to reach into the spark plug wells) with a spark plug socket. If you want to replace the spark plugs yourself, however, there is some general guidance on how to do it. We won’t encourage or discourage you to choose either the DIY route that is up to you, your skill level, and your comfort with working on your car. With that in mind, here’s an estimate of how much each plug will cost you: Average Price By Spark Plug TypeĪs already noted, the exact price will depend on your particular make and model, as well as the number of plugs needed. If your car came with iridium spark plugs from the factory, it is best to stick with them. So with the greater cost comes increased longevity, and more efficiency (in firing and overall voltage requirements).ĭo note that it’s not recommended to downgrade your OEM iridium spark plugs with platinum or copper-based counterparts. However, they are also up to 25% longer lasting than platinum spark plugs. They are usually the most expensive type of spark plug. Iridium spark plugs have a very fine center electrode that requires less voltage to function, making them overall more efficient than other spark plug types.
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