Spark Plug

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    About Spark Plug

    Make rough idling, engine misfiring, or starting trouble a thing of the past with new spark plugs from AutoZone. We carry plugs for virtually every make and model at any spark plug heat range. Buy online for free next day delivery or pick up your plugs in an AutoZone near you.

    Get your car running the way it used to with new copper, platinum, or iridium spark plugs from AutoZone. We carry the best brands at the right price—brands like ACDelco, Bosch, Denso, E3, Motorcraft, NGK, and more.

    Here at AutoZone we make finding the right parts easy. If you find yourself wondering, “What spark plugs do I need?” simply enter your vehicle’s year, make, model, and engine at the top of this page, and we’ll find the right plugs for your vehicle. If you need Honda Civic spark plugs, just input your Civic’s information, and we’ll find parts that fit.

    Spark plugs are crucial to your vehicle. Understanding them is crucial to vehicle maintenance. Learn more with our helpful guides below:
    - Spark plug buyer's guide
    - Bad spark plug symptoms
    - How to change your spark plugs

    Which makes and models do you have Spark Plugs available for?

    We carry every major make and model. Whether you drive a Ford F-150 or a Smart Car, we have the parts for your vehicle. AutoZone is the best place to buy any parts you need for a tune-up.

    Why should I replace my spark plugs?

    The spark plug is possibly the most integral component of the spark-ignition combustion engine. Each one sits at the top of a cylinder head in your engine to combust fuel-air mixture and fire up your vehicle. Combustion occurs through the transfer of electrons across the spark gap.

    The gap is the space between the curved L-shape of the ground electrode and the center electrode that runs through the center of the plug. As electrical current is supplied to the plug by the ignition coil or the magneto, a voltage difference builds up between the two electrodes.

    Once the voltage is high enough, the current ionizes the gases in the fuel-air mixture, allowing the spark to travel across the gap from the center electrode to the ground electrode. The spark reaches temperatures around 60,000 Kelvin (That’s over 100,000 degrees Fahrenheit!)—hot enough to combust the fuel-air mixture.

    Every time the plug sparks, some metal is removed from the electrode. This eventually wears out the spark plug. Plugs last right about 30,000 miles, and it is recommended to change them every 20-40,000 miles.

    Do I have bad spark plugs?

    Signs of bad plugs can be stalling, trouble starting, and engine misfires. Misfires lead to increased emissions, wasted gas, and reduced power—they can even overheat your catalytic converter. If your engine is misfiring, there is a good chance it’s time for new plugs. Don’t put your car at risk for more severe damage down the road. Buy online or stop by your local AutoZone today.