2016 Ford Transit Spark Plug Type, Gap, and Torque Specs

Quick reference

Why the right plug matters

Spark plugs are crucial for your 2016 Ford Transit's performance and fuel efficiency. Using the correct spark plug for your specific engine and ensuring it's properly gapped and torqued is vital. There are several factors to consider:

• Heat Range: Spark plugs are designed with a specific heat range, indicating how quickly they transfer heat away from the combustion chamber. An incorrect heat range can lead to pre-ignition (too hot) or fouling (too cold). Always use the recommended heat range for your engine to maintain optimal performance and prevent damage.
• Electrode Metal: Modern vehicles predominantly use iridium or platinum spark plugs due to their durability and extended service life. These precious metals resist wear much better than traditional copper plugs, allowing for longer replacement intervals. The 2016 Ford Transit uses iridium-tipped plugs, which are designed to last 100,000 miles. While copper plugs offer excellent conductivity, their shorter lifespan makes them unsuitable for most modern vehicles with coil-on-plug ignition systems, which are designed for long-life plugs.

How to gap a spark plug

Proper spark plug gap is essential for a strong, consistent spark. The 2016 Ford Transit utilizes coil-on-plug ignition, meaning each spark plug has its own coil, eliminating the need for a distributor. While many modern iridium and platinum plugs come pre-gapped, it's always a good idea to double-check the gap before installation, especially for the 3.7L Ti-VCT engine. The 3.5L EcoBoost plugs typically don't require adjustment.

To gap a spark plug:

1. Use a wire-type spark plug gapping tool: These tools provide accurate measurements and are less likely to damage the delicate electrode of iridium or platinum plugs. Avoid using coin-style gapping tools on fine-wire plugs.
2. Verify against specifications: Compare the current gap to the recommended specification in the table above.
3. Adjust carefully: If adjustment is needed, gently bend the ground electrode. For small adjustments, use the bending tool on your gapper. Never pry against the center electrode.
4. Re-verify: Double-check the gap after adjustment.

Replacement procedure tips

Replacing spark plugs in your 2016 Ford Transit can be a DIY task, but careful attention to detail is crucial. Both the 3.7L and 3.5L engines feature a coil-on-plug ignition system, meaning each spark plug has an individual ignition coil sitting directly on top of it.

1. Disconnect the negative battery terminal: Always disconnect the battery before starting any electrical work.
2. Remove engine covers: You may need to remove engine covers for access to the coils.
3. Hose and wiring harness removal: Carefully disconnect any hoses or wiring harnesses that obstruct access to the ignition coils. Pay attention to their routing for easier reinstallation.
4. Ignition coil removal: Disconnect the electrical connector from each ignition coil. Then, unbolt the coil (typically a single 7mm or 8mm bolt) and pull straight up to remove it. A gentle twisting motion can help if it's stuck.
5. Clean around the plug: Before removing the old plugs, use compressed air to blow away any dirt or debris around the plug wells. This prevents contaminants from falling into the combustion chamber when the old plug is removed.
6. Spark plug removal: Use a spark plug socket with a rubber insert to remove the old plugs. A universal joint and extension may be needed for some plugs.
7. Anti-seize debate: For the 2016 Ford Transit (and most modern Ford engines), do not use anti-seize on the spark plug threads. The spark plugs are factory-coated with a special anti-corrosion/anti-seize coating. Using additional anti-seize can lead to over-torquing and potential damage, as it changes the friction characteristics of the threads. The torque specifications provided in the table are for dry threads.
8. Dielectric grease on boots: Apply a thin film of dielectric grease inside the ignition coil boot (where it contacts the ceramic of the spark plug). This helps seal out moisture, prevents voltage leaks, and makes future removal easier.
9. Torque plugs correctly: Install the new spark plugs by hand to avoid cross-threading. Once they are finger-tight, use a torque wrench to tighten them to the specified torque value shown in the table above. Proper torque is essential to prevent loosening or damage to the cylinder head threads.
10. Reassemble: Reinstall the ignition coils, ensuring they seat fully. Reconnect electrical connectors, hoses, and engine covers. Reconnect the battery.

Known issues

Fortunately, the 2016 Ford Transit powertrains do not suffer from the notorious two-piece spark plug breakage issues that plagued earlier Ford 3-valve engines (like those found in older F-150s and Expeditions). The spark plugs for the 3.7L and 3.5L EcoBoost engines are conventional one-piece designs, making removal straightforward provided standard precautions are taken.

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