2017 Nissan Titan — Spark Plug Type, Gap & Torque Specs

Quick reference

Note: Nissan uses NGK iridium plugs as factory equipment on the VK56VD. The exact Nissan and supplier part numbers are VIN-dependent; always confirm by VIN or the under-hood emissions label before ordering. Never mix heat ranges.

Why the right plug matters

Spark plugs are application-specific for three big reasons:

• Heat range: The plug must shed heat at the right rate. A plug that runs too hot can cause pre-ignition and detonation; too cold can foul and misfire. Direct-injected VK56VD engines are sensitive to the specified heat range.
• Electrode metal:
  • Iridium: Ultra-fine center electrode with superior wear resistance and strong ignitability. Chosen by Nissan for long life and stable spark—best choice for stock VK56VD and the 105k-mile service interval.
  • Platinum: Good durability but shorter life than iridium; typical replacement around 60k miles. Acceptable if the exact heat range and projection match OE, but not preferred on this engine.
  • Copper/nickel: Excellent conductivity but short life (often 20–30k miles). Not recommended for modern coil-on-plug DI engines due to reduced longevity and potential for drivability issues.

Sticking with the OE-style iridium in the correct heat range preserves cold-start performance, idle quality, and knock control strategy.

How to gap a spark plug

Most iridium long-life plugs come pre-gapped to 1.1 mm (0.044 in) for this application. Even so:

• Check every plug with a tapered (wire/coin) gap gauge. Avoid wedge/feeler types that can damage fine-wire electrodes.
• If adjustment is needed, bend only the ground strap with a light touch. Do not pry against the center iridium tip.
• Keep the ground strap parallel to the center electrode and centered over it.
• Re-check after any adjustment. Large changes shouldn’t be required—if the gap is far off, exchange the plug.

Replacement procedure tips (VK56VD 5.6L V8)

The 2017 Titan uses an 8-coil, coil-on-plug (COP) ignition—no distributor. Basic outline:

1. Work on a cool engine. Disconnect the negative battery cable as a safety step.
2. Remove the engine cover and air intake ducting as needed for access.
3. Blow out the plug wells with compressed air to keep debris out of the cylinders.
4. Unplug each coil connector (tabs can be brittle—depress fully). Remove the 10 mm coil hold-down bolt and lift the coil straight out.
5. Use a 5/8 in (16 mm) spark plug socket with an extension. Break the plug loose, then back it out by hand.
6. Inspect the old plug: deposits, oil on threads or insulator, cracked porcelain, or eroded electrodes can indicate other issues (rich/lean, oil control, or valve cover tube seals leaking).
7. Install the new plug by hand with the socket and extension to avoid cross-threading. These are gasket-seat plugs—snug until the crush washer seats, then torque to 18 lb-ft (24 Nm). If using a torque wrench is impossible, a new gasket typically compresses about 1/2 to 2/3 turn past finger-tight—but torque is preferred.
8. Reinstall coils. Apply a tiny dab of dielectric grease inside each coil boot to ease future removal and help seal out moisture.
9. Reconnect connectors, reassemble intake parts, reconnect the battery, and verify a smooth idle.

Anti-seize? Most modern NGK/Denso plugs have a trivalent or nickel coating on the shell and are designed to install dry. Adding anti-seize can lead to over-torque and thread damage. If you must use it due to prior corrosion, reduce torque by ~20–30% and use only a very small amount on the upper threads—not on the first thread or the electrode end.

Known issues

• Oil in plug tubes: Aging valve cover/tube seals can allow oil to pool around plugs, causing coil boot swelling and misfires. If you see oil on removed plugs or boots, plan on valve cover/tube seal service and new boots.
• Brittle coil connectors: The COP electrical connectors can become fragile with heat. Use a pick to release the lock gently; avoid yanking on wires.
• Carbon tracking on boots: Any white/light lines on the coil boot indicate arcing—replace the boot or coil to prevent repeat misfires.
• Titan XD diesel reminder: The 5.0L Cummins does not use spark plugs. If you own the diesel XD, skip spark plug service entirely.

Unlike some domestic engines (e.g., Ford 3-valve 5.4L with two-piece plugs), the Nissan VK56 series does not have a widespread history of plug shell breakage during removal. Proper cool-engine service and correct torque on installation help ensure trouble-free future removals.

Replacement intervals

• Iridium (OE): ~105,000 miles (168,000 km) under normal service.
• Platinum: ~60,000 miles (96,000 km) if used (match OE heat range exactly).
• Copper: ~30,000 miles (48,000 km); not recommended for this platform.

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