So just how long do spark plugs last? Well, it depends on the vehicle, but the general rule of thumb is that you should replace them before they go bad. Not only do warn spark plugs cause engine problems; if left unattended, they can potentially seize and quickly increase the cost of repairs.

In general, the most expensive “extended-life” spark plugs have a range of about 100,000 to 120,000 miles, but yet, if used for the entire life, they will become worn down. They can be about four-fifths worn by the time they hit 90,000 miles. Yet, not all spark plugs have an extended-life. Copper spark plugs, for example, have a range of about 12,000 to 25,000 miles, while iridium spark plugs can more than double the life to about 60,000 miles.

Signs Your Spark Plugs Are Worn

The best prevention for spark plug problems is regular inspection. Extended-life spark plugs should be inspected every 30,000 miles, while copper or iridium plugs should be inspected every 5,000 to 10,000 miles. But if you suspect your spark plugs are going bad, there are a few tell-tale signs.

• Trouble Starting Your Vehicle: Faulty spark plugs do not generate enough of a spark to light the fuel and air in your engine. This is especially a problem in colder months, and it can cause your vehicle’s battery to drain. If you’re experiencing trouble cold-starting your vehicle, worn spark plugs may be to blame.
• Engine Misfires: Worn spark plugs are more prone to fouling, which means the nose of the plug is dirty from oil, carbon or some other substance. Fouling, in turn, is a common cause of engine misfire.
• Excessive Fuel Consumption: Bad or improperly fitted spark plugs diminish the amount of fuel that is combusted – a problem called incomplete combustion. Because of this, your vehicle wastes fuel, and it can result in up to 25 percent or more drop in efficiency.

  

These are just a few symptoms of faulty spark plugs, but yet spark plugs are not always to blame. These symptoms can be caused by a number of problems, so if you’re unsure, it’s best to check with a licensed mechanic.

Choosing Spark Plugs for Your Vehicle

It’s important to choose the proper spark plugs for your vehicle. Improperly fitting plugs can result in performance issues. So how can you buy spark plugs at fit your vehicle?

First, consult the owner’s manual. Often the vehicle’s manual will have precise information about the type of spark plug that is needed in your vehicle. If not, the manual will have other valuable information, including the size of your engine, the engine’s displacement, the number of cylinders, the spark plug gap, and the type of fuel system in your vehicle. All of this is needed  when determining spark plugs to buy.

If your vehicle’s manual doesn’t have a specific size, consider searching a parts database. Many spark plug manufacturers take information about your vehicle, including make, model and year, and can tell what type is recommended for your vehicle.

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