2024 Nissan Titan — Spark Plug Type, Gap & Torque

Quick reference

Engine	OEM Plug PN	Aftermarket (NGK / Denso / Motorcraft / ACDelco)	Gap (in / mm)	Torque (lb-ft / Nm)	Interval
5.6L Endurance V8 (VK56VD) — Titan	Nissan OEM laser iridium, verify by VIN (PN supersedes)	NGK: Laser Iridium (verify PN) / Denso: Iridium Long Life (verify PN) / Motorcraft: N/A / ACDelco: N/A	0.044 in / 1.1 mm (check label under hood)	18 lb-ft / 25 Nm (clean, dry threads)	105,000 miles (168,000 km) for iridium
5.6L Endurance V8 (VK56VD) — Titan XD	Nissan OEM laser iridium, verify by VIN (PN supersedes)	NGK: Laser Iridium (verify PN) / Denso: Iridium Long Life (verify PN) / Motorcraft: N/A / ACDelco: N/A	0.044 in / 1.1 mm (check label under hood)	18 lb-ft / 25 Nm (clean, dry threads)	105,000 miles (168,000 km) for iridium

Notes:

• Nissan frequently supersedes spark plug part numbers; always confirm by VIN with a Nissan dealer or the factory parts catalog. Do not substitute heat ranges.
• NGK and Denso list multiple iridium options; match the exact OE-equivalent listing for your VIN/production date. Motorcraft and ACDelco generally do not catalog direct applications for this Nissan engine.

Why the right plug matters

The 5.6L Endurance V8 uses long-life, fine-wire iridium plugs engineered for high cylinder pressures and precise combustion under direct-injection strategies. Correct heat range prevents fouling (too cold) and pre-ignition (too hot). Iridium center electrodes and platinum or iridium-tipped ground electrodes resist erosion, maintaining sharp edges for a strong spark over 100k miles.

• Iridium: Best longevity and stability (OE choice). Typical replacement interval ~105k miles when everything is in spec.
• Platinum: Acceptable but shorter life; expect ~60k miles. Not recommended if the OE is iridium.
• Copper/nickel: Great conductors but short life (~20–30k miles). Not advised for this engine due to access effort and ignition demands.

Sticking with the OE-equivalent plug ensures correct reach, thread length, seat style, and projected tip. Avoid changing heat range unless directed by a service bulletin.

How to gap a spark plug

Most OE iridium plugs come pre-gapped to spec. Verify, don’t assume.

• Use a wire-style gap gauge for accuracy. Target about 0.044 in (1.1 mm) unless the under-hood emissions label or service manual specifies otherwise.
• If adjustment is needed, support the ground strap near the tip and make tiny bends. Do not pry against the fragile iridium center electrode.
• Re-check the gap after any adjustment. If a plug was dropped or the porcelain chipped, replace it.

Replacement procedure tips (5.6L VK56VD)

This engine uses coil-on-plug (COP) ignition—one coil per cylinder. Plan on patience and room to work.

1. Preparation

• Let the engine cool fully. Disconnect the negative battery cable.
• Remove the engine cover and air intake ducting as needed for access. Label vacuum and PCV lines.
• Blow out debris around each coil and plug well to keep grit out of the cylinders.

2. Coil removal

• Unplug each coil connector; depress the lock tab to avoid breaking it.
• Remove the small coil hold-down bolt and gently twist/pull the coil to release the boot.
• Inspect boots for oil or carbon tracking; replace any compromised boots or coils.

3. Plug removal/installation

• Use a spark plug socket with an extension; break loose smoothly to protect the porcelain.
• Thread new plugs by hand at least several turns to prevent cross-threading.
• Torque to 18 lb-ft (25 Nm) on clean, dry threads. These are plated plugs—do not use anti-seize. If anti-seize is ever used against OE guidance, reduce torque ~20–30% to avoid overstretching threads.
• Apply a thin film of dielectric grease inside each boot (not on the terminal) to ease future service and prevent moisture intrusion.

4. Reassemble and verify

• Reinstall coils, connectors, intake ducting, and the engine cover.
• Clear any stored misfire codes and verify smooth idle and no misfire counts on a scan tool.

Known issues

• Ford 3-valve 4.6/5.4L two-piece plug breakage: Not applicable to the Nissan 5.6L—this engine uses single-piece plugs.
• GM 5.3L ionization-sensing coil quirks: Not applicable—this Nissan ignition system does not use ion-sensing coils.
• What to watch on the Titan 5.6L: Seized coil boots from heat, debris in plug wells, and over-torqued plugs. Dropping a plug can crack the porcelain—if in doubt, replace it. Always confirm the exact OE iridium plug by VIN; using the wrong reach or heat range can trigger misfires under load.

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