The complexity of replacing spark plugs depends totally on the type of vehicle you’re working on. The national average cost to replace spark plugs is estimated to be between $191-$250. Spark plugs are what keep your engine going, so you definitely don’t want to forget about this service. 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. Is It Safe to Drive with Old Spark Plugs? When replacing the spark plugs, you should also replace the spark plug wires (if your vehicle is so equipped). The emissions sticker under the hood usually has this information, but if the sticker is missing from your vehicle, your local parts store can definitely look this information up for you. Unless your vehicle’s engine has been modified, the easiest way to choose new spark plugs is to use what the manufacturer recommends. This job is a routine maintenance item, and knowing when (and how) to replace spark plugs will help keep your engine running smoothlyīefore changing the spark plugs in your vehicle, you’ll need to purchase new ones. Most engines feature one spark plug per cylinder, but some newer, more advanced engines feature two spark plugs per cylinder. As its name suggests, the spark plug creates a spark in the combustion chamber to ignite the air/fuel mixture, which drives your engine. To put it simply, the spark plug is as important to your engine as the gasoline in your tank.
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