A spark plug provides the electrical spark that ignites the air‑fuel mixture in a gasoline engine. That timed ignition helps the engine start, idle smoothly, and make efficient power.

• Ignition: Creates a spark to begin combustion in each cylinder.
• Driveability: Can support smoother starts and more consistent throttle response.
• Efficiency: Proper plugs may contribute to fuel economy and emissions control.

Spark plugs come in different materials (copper, platinum, iridium), heat ranges, and thread sizes. Diesel engines don’t use spark plugs. To find the right fit, use the vehicle selector on Walmart.com and follow your owner’s manual for specifications like gap and torque.

Several symptoms can point to worn or fouled spark plugs, though other issues can cause similar effects.

• Hard starts: Longer cranking or repeated tries to start.
• Rough idle: Shaking, unstable RPM, or occasional stumbling.
• Hesitation/misfire: Jerking under load or uphill, especially during acceleration.
• Poor economy: Noticeable drop in miles per gallon.
• Warning light: A check-engine light related to misfire may appear.
• Visible wear: Black, oily, or ashy deposits; eroded electrodes.

If you’re inspecting plugs, let the engine cool, remove one wire or coil at a time, and compare the plug condition to your manual’s guidance. A professional inspection can help confirm the cause.

Pricing varies by plug material, pack size, and your engine’s needs rather than a single number.

• Material: Copper, platinum, and iridium differ in durability and performance.
• Pack size: Sets for 4, 6, or 8 cylinders can affect total cost.
• Design: Features like fine‑wire electrodes or double plating may change price.
• Use case: Automotive and small‑engine plugs are built to different specs.

For current pricing, select your year/make/model on Walmart.com and filter by material and pack size. You can compare options, check ratings, and choose delivery or pickup. Availability and regional factors can influence what you see at checkout.

Fitment depends on your engine type and specifications. Most gasoline SUVs use one spark plug per cylinder, with a specific thread size, reach, heat range, and factory gap.

1. Use the “Add your vehicle” or fitment tool on Walmart.com to enter year, make, model, and engine.
2. Confirm details with your owner’s manual, including gap and torque.
3. Choose a plug material that matches your maintenance goals; longer‑life options are often selected for extended service intervals.

If your SUV has a diesel engine, it won’t use spark plugs. Replacement intervals vary by engine and driving conditions, so following the manual is a practical way to maintain performance.

Many new plugs are pre‑gapped for common applications, but shipping and part variations mean it’s a good idea to verify before installation.

1. Check the specified gap in your owner’s manual or under‑hood label.
2. Measure with a wire or feeler‑style gap gauge; adjust only if the plug’s manufacturer allows.
3. Avoid pressing on the center electrode; bend the ground strap gently if needed.
4. Install on a cool engine, torque to spec, and avoid anti‑seize unless your manual recommends it.

Verifying gap and proper torque can help support smooth starts and longer service life, but results can vary depending on engine condition and driving habits.