The most important part of your engine is the spark plug. It's what ignites the fuel in the cylinder, which turns into a powerful explosion that powers your car.

Spark plugs are made up of many different parts, but they all have one purpose: to ignite fuel in the cylinder so that it explodes and pushes your car forward.

The most important part of a spark plug is its tip (the part that actually ignites the fuel). The tip has several different functions: it must be able to create an electric arc when electricity passes through it, it must be able to withstand heat from combustion, and it must be able to withstand the high pressure from combustion in the cylinder.

Your car is a living thing. It needs fuel, it needs oil, and it needs spark plugs to keep the lifeblood flowing.

The spark plug is a small part that does a big job: it ignites the fuel in your engine and keeps your car running. But what happens when those spark plugs are worn out? You'll notice it in the form of poor gas mileage and rough idling—and that's just the beginning. A bad set of spark plugs can lead to misfires, which can cause your entire engine to shut down—and that's no joke!

The life expectancy of a Nissan Spark spark plug is between 25,000 and 40,000 miles. After this point, they will become less effective at providing combustion and can cause misfires or rough idling in your vehicle. As they wear down over time they begin to allow more air into the cylinders where fuel is injected in order to burn more slowly than normal. This causes carbon deposits on top of each piston and cylinder head which can lead to overheating and eventually seizing when exposed for long periods of time without replacement spark plugs installed again soon enough!