2020 Ford Transit Spark Plug Type, Gap & Torque Specs

Quick Reference: 2020 Ford Transit Spark Plug Specifications

Proper spark plug selection and installation are critical for the health and efficiency of your 2020 Ford Transit's engine. Using the correct plug and adhering to the right gap and torque specifications ensures complete combustion, smooth operation, and maximum longevity. This guide covers everything you need to know, from part numbers to installation tips.

Why the Right Plug Matters

A spark plug is a small component that plays a massive role. It must deliver a powerful spark at precisely the right moment while surviving the extreme temperatures and pressures of the combustion chamber. The key factors in choosing a plug are its heat range and electrode material.

• Heat Range: This refers to the plug's ability to dissipate heat. A "hot" plug retains more heat to burn off carbon deposits in a low-speed engine, while a "cold" plug dissipates heat more quickly to prevent pre-ignition (knock) in a high-performance or turbocharged engine like the EcoBoost. Using the wrong heat range can lead to fouling or engine damage.
• Electrode Material: The center and ground electrodes are typically made of a copper core coated in a more durable metal.
  • Iridium: As used in the OEM plugs for both Transit engines, iridium is an extremely hard, dense precious metal with a very high melting point. This allows for a very fine-wire center electrode, which requires less voltage to create a spark. The result is a more focused, consistent spark, leading to better throttle response, improved fuel efficiency, and a very long service life of 100,000 miles.
  • Platinum: A step down from iridium, platinum plugs still offer excellent longevity (typically 60,000-80,000 miles) and performance compared to standard copper plugs.
  • Copper: Basic copper plugs have the best conductivity but wear out the fastest, often needing replacement every 20,000-30,000 miles. They are not recommended for modern ignition systems like those in the Transit, which are designed for long-life iridium plugs.

How to Gap a Spark Plug

Even pre-gapped plugs should be checked before installation. The gap is the distance between the center and ground electrodes, and it must be precise. A gap that is too small can result in a weak spark, while a gap that is too large can cause a misfire.

1. Use the Right Tool: A feeler gauge or a dedicated spark plug gapper with wire-style gauges is the best tool. Avoid the cheap "coin-style" gappers, as they can put excessive pressure on the fine-wire iridium tip and damage it.
2. Check the Gap: Slide the correct wire gauge (e.g., 0.030") between the electrodes. It should slide through with a slight drag. If it's too loose or won't fit, the gap needs adjustment.
3. Adjust Carefully: To adjust, gently bend the ground strap (the curved electrode) only. Never pry against or touch the delicate center electrode. Use the adjustment slot on your gapper tool to lightly bend the ground strap in or out. Re-check the measurement and repeat until it's perfect.

Replacement Procedure Tips

The 2020 Transit uses a modern coil-on-plug (COP) ignition system, which eliminates the need for distributor caps, rotors, and spark plug wires. Each spark plug has its own ignition coil sitting directly on top of it.

• Coil-on-Plug Removal: After disconnecting the negative battery terminal, unplug the electrical connector from the coil. Then, remove the single hold-down bolt (typically 8mm). The coil should pull straight up and off the spark plug with a gentle twist. If it feels stuck, it's likely the rubber boot has adhered to the porcelain of the plug. A little twisting force is all that should be needed.
• The Anti-Seize Debate: Modern Motorcraft and NGK plugs feature a trivalent or nickel plating that acts as an anti-seize agent, preventing them from getting stuck in the aluminum cylinder heads. For this reason, Ford officially recommends not using additional anti-seize compound. Applying it can alter the torque reading, causing you to over-tighten the plug, which can stretch the plug shell and damage the cylinder head threads.
• Dielectric Grease: While anti-seize is a no-go, applying a small amount of dielectric grease to the inside of the rubber coil boot is highly recommended. This prevents the boot from sticking to the new plug's porcelain and makes future plug changes easier. It also helps seal out moisture and prevent voltage leaks.

Known Issues

While the 2020 Transit engines are generally robust, owners of older Ford trucks may be familiar with spark plug issues on other engines. Fortunately, the 3.5L EcoBoost and 3.5L PFDi V6 do not suffer from the infamous two-piece spark plug breakage issue that plagued the earlier Ford 3-valve 5.4L and 4.6L V8 engines from 2004-2008. The plugs used in the Transit are a conventional one-piece design that can be removed with standard tools and techniques without the high risk of breakage.

Need plugs replaced? Find a shop on Repairius.