5 Signs of Bad Spark Plugs

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Sometimes all it takes to significantly improve your vehicle’s performance is replacing one of the smallest components—the spark plugs! Small but mighty, spark plugs play a major role in your vehicle. Keep an eye out for the signs of bad spark plugs and get new spark plugs regularly to help your vehicle perform at its best.

What Do Spark Plugs Do?
Spark plugs are small electrical devices that trigger combustion in your vehicle’s engine. They provide the needed ‘spark’ to ignite the air-fuel mixture in the engine cylinders’ combustion chambers, generating power for the engine. This is how your car starts, stays powered and runs smoothly.

How Long Do Spark Plugs Last?
The condition of your spark plugs can impact the performance of the engine. Fortunately, spark plugs don’t require replacement very often, despite their heavy usage (they ‘spark’ thousands of times per minute!).

Most manufacturers suggest getting new spark plugs installed every 30,000 miles, but you may be able to go up to 100,000 miles depending on the type of spark plugs your car has. For example, a copper spark plug won’t last as long as a spark plug made of stronger materials, like platinum or iridium.

No matter what, you should always replace spark plugs as a set (one for each engine cylinder) and follow the manufacturer’s recommendation for what type of plugs to use (found in the owner’s manual).

5 Signs You Need New Spark Plugs
1. Engine Misfires 
2. Poor Gas Mileage 
3. Trouble Starting
4. Slow Acceleration 
5. Rough Idling