2020 Ford Explorer Spark Plug and Torque Specifications

Quick Reference: 2020 Explorer Spark Plug Specifications

Note: Always confirm part numbers with your VIN before purchasing. Aftermarket equivalents are provided for reference and may have slightly different specifications.

Why the Right Spark Plug Matters

Choosing the correct spark plug isn't just about finding one that fits. Modern engines, like those in your 2020 Explorer, are highly sophisticated systems. The spark plug is a critical component that directly impacts engine performance, fuel efficiency, and emissions. Key factors include:

• Heat Range: This determines how quickly the plug tip dissipates heat. A plug that is too "hot" (dissipates heat slowly) can lead to pre-ignition, while a plug that is too "cold" (dissipates heat quickly) can foul with carbon deposits. The factory-specified heat range is essential for the health of your EcoBoost or Hybrid engine.
• Electrode Material: The 2020 Explorer uses long-life Iridium-tipped spark plugs from the factory. While older vehicles often used copper or platinum plugs, iridium offers superior durability and a more consistent spark over a longer service life. Copper plugs provide excellent conductivity but wear out quickly (typically 20-30k miles). Platinum is a good middle ground, but Iridium is the modern standard for performance and longevity, easily lasting up to 100,000 miles in normal conditions.

How to Gap a Spark Plug

Properly gapping a spark plug ensures the spark has the perfect distance to jump, creating an efficient flame front to ignite the air-fuel mixture. While most modern iridium plugs come pre-gapped, it is crucial to verify the gap before installation.

1. Use the Right Tool: A feeler gauge or a dedicated wire-style gapping tool is the best choice. Avoid the simple disc-style "coin" gappers, as they can put pressure on the delicate iridium center electrode and damage it.
2. Check the Gap: Gently slide the correct wire or blade from your gauge tool between the center and ground electrodes. It should slide through with slight resistance. If it's too loose or won't fit, the gap needs adjustment.
3. Make Gentle Adjustments: To adjust, only bend the ground strap. Use the slot in your gapping tool or a pair of needle-nose pliers to gently bend the ground strap up or down. Never pry against or touch the center electrode. Re-check the measurement until it is within the specified range.

Replacement Procedure Tips for 2020 Explorer

All engines in the 2020 Explorer lineup use a modern Coil-On-Plug (COP) ignition system, which eliminates the distributor and spark plug wires of older vehicles. Each spark plug has its own dedicated ignition coil sitting directly on top of it.

• Coil-On-Plug Removal: After removing the engine cover, you will see the ignition coils. Disconnect the electrical connector from the coil, then unbolt the small hold-down bolt (typically 8mm or 10mm). The coil can then be gently twisted and pulled straight up to expose the spark plug deep in the cylinder head well. A blast of compressed air into the well before removing the plug is highly recommended to prevent dirt and debris from falling into the cylinder.
• The Anti-Seize Debate: Historically, technicians applied a light coat of anti-seize compound to spark plug threads to prevent them from seizing in the cylinder head. However, many modern spark plug manufacturers, including NGK (an OEM supplier to Ford), apply a special trivalent (zinc-chromate) plating to their plug threads. This plating provides its own anti-seize properties and prevents corrosion. Applying additional anti-seize can act as a lubricant, leading you to inadvertently over-torque the spark plug, which can stretch the threads and damage the cylinder head. For plugs with this plating, it is often recommended to install them clean and dry. Always follow the specific recommendation of the plug manufacturer.
• Dielectric Grease: While anti-seize on the threads is debatable, applying a small amount of dielectric grease to the inside of the ignition coil boot is a best practice. This grease prevents the boot from sticking to the spark plug porcelain over time and seals out moisture, preventing corrosion and misfires.

Known Issues

Ford owners may be familiar with horror stories of broken spark plugs, specifically on the 3-valve modular engines (e.g., 5.4L V8) from 2004-2008. These engines used a problematic two-piece spark plug shell design that was prone to separating during removal, leaving the lower portion stuck in the head.

Good news: The engines in the 2020 Ford Explorer do not use this design. They use a conventional, robust one-piece spark plug that does not suffer from this specific issue. As long as the engine is cool and you are using the proper torque specifications, replacement is a straightforward process without the high risk of breakage seen in older models.

Need plugs replaced? Find a shop on Repairius.