Simply put, a spark plug takes high voltage electricity on one end and creates a spark at the other end. That spark then ignites the fuel and air mixture inside the combustion chamber, generating the energy that powers the car. A typical spark plug is grayish-brown in color and is made up of an outer shell, a connecting terminal, a core, and several electrodes. On the end that produces a spark, there is a gap between two or more electrodes. When the high voltage is sent from the other end, sparks jump the gap and small pieces of the electrodes are burned off. This occurs hundreds of times a minute while your car is running. Consequently, the gap will widen overtime and your engine will start to misfire. Additional symptoms of spark plug failure include decrease in efficiency, increase in emissions, difficulty starting, and poor vehicle performance. Neglecting to fix a failing spark plug can lead to expensive damage to your vehicle’s catalytic converter. At Lake Norman, we recommend that your car’s spark plugs be replaced between 30,000 and 100,000 miles unless otherwise specified by your owner’s manual. Our expert technicians will ensure that the best spark plug for your vehicle’s engine is installed.