2017 Ford Explorer Spark Plug Replacement – Restore Power

ByRobert Lozano

When your 2017 Ford Explorer starts to feel sluggish or its fuel economy dips, worn spark plugs are often the culprit. This comprehensive guide provides step-by-step instructions for a successful 2017 Ford Explorer spark plug replacement, empowering you to tackle this crucial maintenance task yourself. Get ready to bring back that smooth idle and responsive acceleration.

Is your 2017 Ford Explorer feeling a little less peppy than it used to? Are you noticing a drop in fuel economy or a rough idle at stoplights? These are classic signs that your spark plugs might be ready for retirement. Ignoring them can lead to more serious engine issues down the road, impacting everything from your daily commute to your off-road adventures.

Fortunately, performing a 2017 Ford Explorer spark plug replacement is a highly manageable DIY project for many car owners and weekend mechanics. With the right tools, a bit of patience, and this detailed guide, you can restore your Explorer’s performance, improve its fuel efficiency, and gain a deeper understanding of your vehicle’s mechanics. Let’s dive in and get your Explorer running like new again!

Why Your 2017 Ford Explorer Needs New Spark Plugs (and When)

Spark plugs are small but mighty components of your ignition system. They deliver the electrical spark that ignites the air-fuel mixture in your engine’s combustion chambers, driving your vehicle forward. Over time, the electrodes on these plugs wear down, leading to a weaker spark and less efficient combustion.

Common Symptoms of Worn Spark Plugs

Recognizing the signs of failing spark plugs is the first step in proactive maintenance. Don’t wait for a complete breakdown.

  • Reduced Fuel Economy: A worn plug can’t ignite fuel efficiently, causing your engine to consume more gas.
  • Engine Misfires: You might feel a slight hesitation or stumble, especially during acceleration. This often triggers a “check engine” light with codes like P0301-P0306 (cylinder misfire).
  • Rough Idle: If your Explorer shakes or vibrates more than usual when idling, it could be due to one or more cylinders not firing correctly.
  • Slow Acceleration: A lack of power when pressing the gas pedal is a common complaint.
  • Difficulty Starting: Weak sparks can make your engine harder to turn over, especially in cold weather.

Recommended Service Interval for Spark Plugs

Ford generally recommends spark plug replacement for the 2017 Explorer, particularly models equipped with the 3.5L V6 (including the EcoBoost variants), every 60,000 to 100,000 miles. Always consult your owner’s manual for the most accurate service schedule for your specific engine. However, if you experience any of the symptoms above, consider an earlier inspection.

Gathering Your Gear: Tools and Parts for the Job

Before you begin, gather everything you’ll need. Having all your tools and parts ready will make the process much smoother and prevent unnecessary interruptions.

Essential Tools You’ll Need

  • Socket Wrench Set: A 3/8-inch drive ratchet with various extensions (3-inch, 6-inch, 10-inch) will be invaluable.
  • Spark Plug Socket: A 5/8-inch spark plug socket is typically required. Ensure it has a rubber insert to protect and hold the plug.
  • Torque Wrench: Absolutely essential for tightening new spark plugs to the manufacturer’s specifications. This prevents overtightening, which can damage the cylinder head, or undertightening, which can cause leaks.
  • Swivel or Universal Joint: Some spark plugs, especially those towards the firewall, can be tricky to reach without this.
  • Flathead and Phillips Screwdrivers: For various clamps and fasteners.
  • Pliers: Needle-nose pliers can help with stubborn electrical connectors.
  • Dielectric Grease: Apply a small amount inside the spark plug boot to prevent corrosion and make future removal easier.
  • Anti-Seize Compound: A tiny dab on the spark plug threads (if not pre-coated) prevents them from seizing in the cylinder head.
  • Spark Plug Gap Tool: While most modern plugs come pre-gapped, it’s always good practice to double-check.
  • Clean Rags or Shop Towels: For cleaning surfaces and wiping away debris.
  • Work Light: A good LED work light will illuminate tight spaces.
  • Compressed Air (Optional): Useful for blowing debris out of the spark plug wells before removal.

Choosing the Right Spark Plugs for Your Explorer

Always use the spark plug type recommended by Ford for your 2017 Explorer. These are usually iridium or platinum-tipped plugs, designed for longevity and optimal performance in modern engines. Using incorrect plugs can lead to poor performance or even engine damage. Check your owner’s manual or a reputable parts catalog for the exact part number.

Other Recommended Materials

Consider replacing your ignition coil boots or even the entire coil packs if they show signs of wear, cracking, or corrosion. While not always necessary, it’s a good time to inspect them. Also, having a can of electrical contact cleaner can be helpful for cleaning electrical connections.

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Safety First: Preparing for Your Spark Plug Replacement

Safety is paramount when working on any vehicle. Taking a few precautions will protect you and prevent damage to your Explorer.

Engine Cool Down and Battery Disconnect

Never work on a hot engine. The exhaust manifolds and other components can cause severe burns. Allow your Explorer’s engine to cool completely, ideally for several hours or overnight. Once cool, disconnect the negative terminal of your battery using a 10mm wrench. This prevents accidental shorts and protects your vehicle’s electrical system.

Workspace Safety

Ensure you’re working in a well-ventilated area, preferably on a level surface. Wear appropriate safety gear, including gloves and eye protection. Keep your workspace clean and organized to avoid tripping hazards or misplacing tools.

Step-by-Step 2017 Ford Explorer Spark Plug Replacement

Now that you’re prepared, let’s get into the heart of the job. Take your time, follow each step carefully, and refer to your owner’s manual for specific torque values.

Accessing the Coil Packs

  1. Remove Engine Cover: Most Explorer models have a decorative plastic engine cover. Gently pull it straight up to release it from its mounting points.
  2. Locate Coil Packs: Your 2017 Explorer uses a “coil-on-plug” ignition system, meaning each spark plug has its own ignition coil directly on top of it. There will be six coil packs, three on the front bank of the engine and three on the rear bank. The rear bank can be more challenging to access.
  3. Disconnect Electrical Connectors: Carefully press the tab on each coil pack’s electrical connector and pull it straight off. Avoid yanking on the wires.
  4. Remove Coil Pack Bolts: Each coil pack is typically held down by one 8mm or 10mm bolt. Use your ratchet and appropriate socket to remove these bolts. Keep them organized.
  5. Remove Coil Packs: Gently twist and pull each coil pack straight up to remove it from the spark plug well. Inspect the rubber boot for cracks or wear. If the boot detaches and stays on the plug, use needle-nose pliers to carefully retrieve it.

Removing the Old Spark Plugs

  1. Clean Spark Plug Wells: Before removing any plugs, use compressed air to blow out any dirt, dust, or debris from around the spark plug well. This prevents contaminants from falling into the combustion chamber once the old plug is out.
  2. Insert Spark Plug Socket: Carefully insert your 5/8-inch spark plug socket with an extension into the well until it seats firmly on the spark plug.
  3. Loosen Spark Plugs: Using your ratchet, turn the spark plug counter-clockwise to loosen it. If it feels extremely tight, apply a small amount of penetrating oil around the plug base and let it sit for a few minutes. Loosen slowly to avoid stripping threads.
  4. Extract Old Plugs: Once loose, continue turning until the plug is free. The rubber insert in your spark plug socket should hold the plug, allowing you to lift it out.
  5. Inspect Old Plugs: Examine your old spark plugs. Their condition can tell you a lot about your engine’s health (e.g., carbon fouling, oil fouling, or normal wear).

Preparing and Installing New Plugs

  1. Check New Plug Gap: Even if your new spark plugs are “pre-gapped,” it’s wise to double-check with a spark plug gap tool. Refer to your owner’s manual for the correct gap specification. Adjust only if necessary and very carefully.
  2. Apply Anti-Seize: Apply a tiny amount of anti-seize compound to the threads of each new spark plug. Be careful not to get any on the electrode or porcelain insulator.
  3. Install New Plugs by Hand: Place a new spark plug into your spark plug socket. Carefully lower it into the spark plug well and start threading it by hand. This is crucial to avoid cross-threading. You should be able to turn it several rotations smoothly.
  4. Torque New Plugs: Once hand-tight, use your torque wrench to tighten the spark plug to the manufacturer’s specified torque (usually around 10-14 ft-lbs, but always verify). Do not overtighten, as this can damage the cylinder head threads.

Reassembly and Final Checks

  1. Apply Dielectric Grease: Put a small amount of dielectric grease inside the rubber boot of each coil pack. This improves electrical connection and helps prevent moisture intrusion.
  2. Reinstall Coil Packs: Carefully push each coil pack straight down onto its respective spark plug until it seats firmly. Ensure it clicks into place.
  3. Secure Coil Pack Bolts: Reinstall and tighten the coil pack retaining bolts. Again, use a torque wrench if specified, or tighten them snugly but not excessively.
  4. Reconnect Electrical Connectors: Reattach all electrical connectors to the coil packs, ensuring they click securely.
  5. Reinstall Engine Cover: Place the engine cover back onto its mounting points and press down firmly.
  6. Reconnect Battery: Reconnect the negative battery terminal.
  7. Test Drive: Start your Explorer. It might run slightly rough for a few seconds as the PCM (Powertrain Control Module) readjusts. Take it for a short test drive to ensure everything feels smooth and responsive. Listen for any unusual noises or misfires.
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Troubleshooting Common Issues After Spark Plug Replacement

Even with careful work, sometimes minor issues can arise. Don’t panic; most are easily fixable.

Engine Misfire or Rough Idle

If your engine is misfiring or idling roughly after the 2017 Ford Explorer spark plug replacement:

  • Check Coil Pack Connections: Ensure all electrical connectors are fully seated and clicked into place.
  • Verify Coil Pack Installation: Make sure each coil pack is properly seated over its spark plug.
  • Inspect Spark Plug Wires (if applicable): While the 2017 Explorer uses coil-on-plug, if you have an older model or different engine, check wires.
  • Re-check Torque: An undertightened plug can cause misfires. An overtightened one can damage the plug or head.
  • Inspect New Plugs: Did one get dropped and crack the porcelain insulator?

Check Engine Light

If the check engine light illuminates, retrieve the diagnostic trouble codes (DTCs) using an OBD-II scanner. Common codes after a spark plug job might include misfire codes (P030X) or codes related to disconnected sensors if anything was accidentally unplugged during the process. Clear the codes after rectifying any issues.

Pro Tips for a Smooth Spark Plug Job

Leverage these insights for an even better experience and to ensure the longevity of your repair.

Torque Specifications Matter

We can’t stress this enough: using a torque wrench is not optional. Overtightening spark plugs can strip the aluminum threads in your cylinder head, leading to an expensive repair. Undertightening can cause combustion gases to escape, damaging the plug and the coil pack. Always use the manufacturer’s specified torque.

Anti-Seize and Dielectric Grease Best Practices

A small amount of anti-seize on the plug threads is sufficient. Too much can act as an insulator, affecting the plug’s ground path, or drip onto the electrode. Dielectric grease in the coil pack boot prevents moisture and ensures good electrical insulation, making future removal easier.

Inspecting Coil Packs and Wiring

While you have everything apart for the 2017 Ford Explorer spark plug replacement, take a moment to visually inspect your ignition coil packs. Look for cracks in the plastic housing, signs of arcing, or corrosion on the electrical terminals. If a coil pack looks compromised, now is the ideal time to replace it. Similarly, check any nearby wiring for fraying or damage.

For those times when you’re out on the trail or deep in the wilderness, understanding these components is crucial. A failing spark plug might just give you a rough idle on a mountain pass, but a completely dead one could leave you stranded. Knowing how to diagnose and, if necessary, even perform a temporary roadside repair (like swapping a known good coil pack to identify the problem cylinder) can be a lifesaver. Always carry basic tools and spare parts if you’re venturing far from civilization.

Frequently Asked Questions About 2017 Ford Explorer Spark Plug Replacement

How often should I replace spark plugs in my 2017 Explorer?

Ford typically recommends spark plug replacement every 60,000 to 100,000 miles for most 2017 Explorer engines. However, if you experience symptoms like misfires or reduced fuel economy, consider an earlier inspection.

What type of spark plugs does a 2017 Ford Explorer use?

The 2017 Ford Explorer commonly uses iridium or platinum-tipped spark plugs. Always refer to your owner’s manual or a reputable parts database for the exact OEM-recommended plug type and part number specific to your engine (e.g., 3.5L V6, 2.3L EcoBoost, 3.5L EcoBoost).

Can I replace spark plugs myself if I’m a beginner?

Yes, replacing spark plugs on a 2017 Ford Explorer is a very achievable DIY task for a careful beginner with basic mechanical skills. The most important things are to have the right tools, follow safety precautions, and use a torque wrench to prevent damage.

What happens if I don’t replace spark plugs?

Ignoring worn spark plugs can lead to decreased fuel efficiency, reduced engine power, rough idling, engine misfires, and potentially catalytic converter damage due to unburnt fuel entering the exhaust system. Over time, it can also strain other ignition components like coil packs.

You’ve now got all the knowledge and steps needed to successfully perform a spark plug replacement on your 2017 Ford Explorer. This routine maintenance not only saves you money but also gives you confidence in your vehicle’s reliability and performance. By tackling this job yourself, you’re not just replacing parts; you’re building a deeper connection with your vehicle and ensuring it’s ready for every journey, whether it’s the daily commute or an epic off-road adventure. Drive safe and enjoy that restored power!

Robert Lozano
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