Spark Plugs

You can't start your GM car, SUV, truck, or van without ignition. That only happens when the spark plugs produce an initial flash of electricity that inflames the air-and-fuel mixture in the engine's combustion chamber.

How Spark Plugs Work

That flash is created when the spark plugs send an arc of electricity across a gap between two leads. The gaps are carefully calibrated to provide the ideal sparking that's required to ignite the mist inside the engine cylinder. Once you have ignition, your pistons start to pump, the crankshaft begins rotating, and you're ready to head out on your way.

Unfortunately, spark plugs can begin to weaken. Whether they've grown corroded or the gaps have widened too far to produce an effective spark, you need to resolve the matter ASAP, or your engine will begin to act up.

How to Spot Failing Spark Plugs

Signs of problems include:

• Misfiring engine
• Unsteady idling
• Problems starting your vehicle
• Your "Check Engine" light comes on

Genuine OEM Spark Plugs Are Your Best Choice

Your owner's manual will tell you how long you can expect to drive on a set of spark plugs before they need replacing. You want to take care of it before your old ones get past their rated mileage in order to prevent engine problems. Your manufacturer makes the only spark plugs that are guaranteed to be compatible with your vehicle's engine. Order today from our online auto parts department and we'll get them shipped right to your door!