2016 Toyota Tundra Spark Plug Specs: Type, Gap & Torque

As an ASE-certified master technician, I’ve serviced countless Toyota trucks over the years. When it comes to the 2016 Toyota Tundra, you are dealing with two incredibly reliable naturally aspirated V8 engines: the 4.6L (1UR-FE) and the legendary 5.7L (3UR-FE). Both of these engines share the same basic ignition architecture, utilizing a robust coil-on-plug (COP) ignition system. To keep your Tundra towing, hauling, and cruising smoothly, using the correct spark plugs, torquing them properly, and adhering to the factory service intervals is absolutely critical.

Here is your comprehensive guide to 2016 Toyota Tundra spark plug specifications.

Quick reference

(Note: Motorcraft and ACDelco are generally not recommended for Toyota powertrains. Stick to the Japanese OEM suppliers, Denso and NGK, for optimal performance and longevity).

Why the right plug matters

Modern Toyota V8 engines are highly calibrated machines, and installing the correct spark plug is vital.

• Heat Range: Using a plug with the wrong heat range can spell disaster. A plug that runs too hot can cause pre-ignition and catastrophic engine damage, while a plug that runs too cold will quickly foul with carbon deposits, causing misfires and poor fuel economy. Denso and NGK plugs specified for the Tundra have the exact heat range required by the 1UR-FE and 3UR-FE.
• Electrode Metal: The 2016 Tundra comes from the factory with Iridium long-life spark plugs. Iridium is significantly harder and more durable than platinum or traditional copper. While copper plugs offer excellent conductivity, they wear out in as little as 30,000 miles. Iridium plugs, on the other hand, maintain a sharp electrode edge for over 100,000 miles, ensuring a consistent spark and maximizing the coil's efficiency over a massive lifespan.

How to gap a spark plug

Most premium Iridium spark plugs (like the Denso SK20HR11) come pre-gapped from the factory at 0.043 inches (1.1 mm). However, it is always a best practice to verify the gap before installation in case the plug was dropped during shipping.

1. Use the right tool: Do not use a cheap coin-style gauge on Iridium plugs. Use a wire-style feeler gauge to gently measure the gap.
2. Be gentle: The iridium center electrode is extremely thin (often just 0.4mm to 0.7mm thick) and brittle. Never pry against the center electrode.
3. Adjusting: If the gap is too tight, use the bending tool on your gauge to lightly bend the ground strap outward. If it’s too loose, gently tap the ground strap on a soft wooden workbench to close the gap.

Replacement procedure tips

Replacing plugs on the 2016 Tundra’s 4.6L or 5.7L V8 is a straightforward job compared to many modern trucks, but there are a few professional tips to follow:

• Coil-on-Plug Removal: The Tundra uses an individual ignition coil for each cylinder. Remove the 10mm retaining bolt, unclip the harness connector, and pull the coil straight up and out. Keep track of which coil goes to which cylinder if you are reusing them.
• The Anti-Seize Debate: Should you use anti-seize on the spark plug threads? If you are using premium Denso or NGK plugs, the answer is no. These plugs feature a special trivalent metal plating that prevents them from seizing in the aluminum cylinder head. Adding anti-seize acts as a lubricant, which can easily cause you to over-torque the plug and strip the delicate aluminum threads in the cylinder head. Install them dry.
• Dielectric Grease: Apply a very small dab of dielectric grease to the inside of the coil boot before snapping it back onto the new spark plug. This prevents moisture intrusion, stops high-voltage tracking, and ensures the rubber boot won't bake onto the porcelain over the next 120,000 miles.

Known issues

Fortunately, the 2016 Toyota Tundra does not suffer from the infamous spark plug design flaws seen in other trucks from this era (such as the nightmare Ford 5.4L 3-valve engines with their 2-piece plugs that break off in the head, or the GM 5.3L ionization-sensing coil sensitivities).

However, because the Tundra's spark plugs sit deep inside the spark plug tubes, dirt, sand, and debris often collect at the base of the plug. Always use compressed air to blow out the spark plug tubes before loosening the old plugs. If you skip this step, grit will fall directly into the open combustion chamber, potentially scoring the cylinder walls and causing permanent engine damage.

Need plugs replaced? Find a shop on Repairius.