Spark Plugs

Replace Worn Spark Plugs

While many motorists know the function of spark plugs, fewer understand the wear and tear process that leads to replacement. Spark plugs are the threaded components that screw into the engine's combustion chambers and create the electrical spark needed to ignite the air-fuel mixture. These parts endure extreme temperatures and pressures thousands of times per minute during engine operation. Properly functioning spark plugs ensure complete combustion for maximum power and fuel efficiency. We stock genuine Nissan spark plugs with electrode materials and heat ranges matched precisely to your engine design.

How Spark Plugs Ignite Fuel

Spark plugs receive high-voltage electrical pulses from the ignition system through a central electrode. This voltage jumps a small gap to a ground electrode, creating a spark that ignites compressed fuel and air. The resulting combustion pushes the piston down to generate power. Plug heat range determines how quickly the plug transfers combustion heat away from electrodes. Your Rogue and Maxima both require spark plugs with specific gap settings and thread reaches for proper combustion chamber fit. These components work with the ignition system to deliver precisely timed sparks for each cylinder. Genuine Nissan spark plugs use electrode materials that resist erosion and maintain consistent gap dimensions.

Why Spark Plugs Wear Out

Spark plugs deteriorate when electrode material erodes from millions of electrical discharges. Carbon deposits from incomplete combustion insulate electrodes and prevent reliable sparking. Oil or coolant leaking into combustion chambers fouls plug surfaces. Physical damage from improper installation or overheating can crack ceramic insulators. Aftermarket plugs often use cheaper electrode materials that wear quickly and incorrect heat ranges that cause fouling or overheating. Generic replacements may have wrong thread lengths that prevent proper seating or cause piston contact.

When Spark Plugs Need Replacement

Replace spark plugs when the engine misfires, runs rough, or shows reduced power output. Difficulty starting or increased fuel consumption indicates worn plugs. If the check engine light illuminates with misfire codes, plug inspection is necessary. Visible electrode erosion or gap widening beyond specifications requires replacement. Most spark plugs need replacement every 30,000 to 100,000 miles depending on plug type and driving conditions. The Melloy Nissan parts team has all the parts you need to keep your ride looking and running great.