Spark Plugs

Your spark plugs ignite the air-and-fuel mix inside your vehicle's engine. The process, which is named spark ignition, begins when you turn the key in the ignition lock cylinder. Of course, if your model is newer, you may just push a start button. Either way, the ignition switch activates, leading your car battery, starter motor, starter solenoid, and ignition coil to team up to produce a small electric charge. The spark plugs capture that charge in their leads, leading to combustion. Once that occurs, your pistons pump, the crankshaft starts to turn, and you're on your way.

How Long do Spark Plugs Last?

Your owner's manual will detail the rated mileage for your spark plugs. It's best to change them before they reach the top end of that range, or you may start to experience problems. That's because eventually even the best spark plugs can become corroded or see the gap between the leads grow too wide to generate an effective spark. Signs of trouble include:

• The engine misfires
• Uneven idling
• You have trouble starting your vehicle
• The "Check Engine" light comes on

If you're experiencing these symptoms, don't presume that your starter or alternator are at fault. Check your spark plugs first, since that's the likelier issue – and a more affordable solution to boot!

Which Spark Plugs Should I Buy?

Genuine OEM spark plugs are the only ones that you can count on to be compatible with your model's engine. Find yours right here in our online GM auto parts catalog. Buy today and we'll ship your order right to your door!