OEM GM Spark Plugs

In order to start your GM car, pickup, van, or SUV, you first need ignition. That only happens thanks to the factory-installed spark plugs, which deliver the initial flash that combusts the air-and-fuel mixture inside your engine.

How Spark Plugs Work

That flash comes about when the spark plugs fire an arc of electricity across the gap between two leads in the head. Those gaps are precisely adjusted in order to produce the optimal spark needed for igniting the mixture inside the combustion chamber.

What if your GM vehicle is powered by a diesel engine, though? In that case, you have glow plugs instead of spark plugs. Glow plugs feature a heating element in their tip. The element ignites the fuel mist that's sprayed into the engine cylinder.

How to Spot Failing Spark Plugs

Over time, your spark plugs may become faulty. Perhaps the gaps have widened too far to generate effective sparking, or maybe the plugs have become corroded. Whenever that happens, you'll experience trouble with your engine. Signs of this include:

• Uneven idling
• Engine misfires
• Problems starting your vehicle
• Your "Check Engine" dashboard light engages

Buy Genuine GM Spark Plugs Online

Your owner's manual will detail when you need to replace your spark plugs. Be sure to replace them before they hit that distance rating, and you should be able to avoid further trouble. Your OEM makes the only spark plugs that are guaranteed to be compatible with your engine, ensuring the trustworthy performance you want. Find yours right here in our online auto parts catalog. Buy now and we'll ship your order right to your front door!