Parts for your 2004 Toyota Land cruiser-Spark plugs

2004 Toyota LandCruiser Spark Plugs

Technical references confirm that whether spark plugs are relevant on a 2004 Toyota LandCruiser depends on the engine fitted. The petrol V8 model (UZJ100 with the 2UZ‑FE) uses eight spark plugs—this is detailed in Toyota’s UZJ100 Repair Manual and parts catalogues for the 2UZ‑FE. The turbo‑diesel model (HDJ100 with the 1HD‑FTE) does not use spark plugs, as diesel engines ignite fuel by compression and instead employ glow plugs for cold starting, as outlined in Toyota’s HDJ100 service documentation and diesel system guides.

For 2004 LandCruiser vehicles running the 4.7‑litre 2UZ‑FE petrol V8, spark plugs are central to easy starts, smooth idle, and strong pull up hills. Each cylinder’s plug works with a coil‑on‑plug setup to fire the air‑fuel mix at precisely the right moment. Quality iridium plugs cope well with touring, towing, and the heat loads that come with Aussie and Kiwi conditions.

As part of regular servicing, spark plugs on the 2UZ‑FE are long‑life items, but they aren’t “fit and forget”. Iridium types typically go about 100,000–120,000 kilometres before replacement is due, while a quick inspection every 40,000–60,000 kilometres helps spot issues early. Hard starting, a lumpy idle, pinging under load, sluggish acceleration, or a jump in fuel use are common signs the plugs are tired. Frequent dusty work, lots of short trips, heavy towing, or extended high‑load driving can justify bringing the replacement forward.

• Use the correct spec and heat range (OEM examples include Denso SK20R11 or NGK IFR6A11, iridium, 1.1 mm gap). Iridium tips are pre‑gapped, avoid filing.
• Replace all eight together to keep the engine balanced, and inspect the coil boots for cracks or tracking. A light smear of dielectric grease on the inside of each boot helps sealing.
• Blow out debris from the plug wells before removal so grit doesn’t drop into the cylinder. Thread the new plug by hand first to avoid cross‑threading.
• Tighten to the factory torque spec (use a torque wrench). Anti‑seize is generally not recommended on modern, plated plug threads—follow the plug maker’s guidance.

Keeping the 2UZ‑FE’s plugs fresh pays back with crisp throttle response, cleaner emissions, and better economy. It’s a straightforward job for a competent technician and fits neatly into a major service interval for a well‑kept 100 Series.

Popular questions

How many spark plugs are in a 2004 Toyota LandCruiser?

The 4.7‑litre 2UZ‑FE petrol V8 uses eight spark plugs—one per cylinder in a coil‑on‑plug setup. The 4.2‑litre 1HD‑FTE turbo‑diesel uses no spark plugs, it relies on compression ignition and has glow plugs for cold starts.

What spark plug type and gap does the 2UZ‑FE use?

Quality iridium plugs are specified, commonly Denso SK20R11 or NGK IFR6A11 (or equivalents) with a 1.1 mm gap. They’re supplied pre‑gapped, the fine iridium tip shouldn’t be filed.

When should spark plugs be replaced on the 2UZ‑FE?

Under normal conditions, iridium plugs are typically replaced around 100,000–120,000 kilometres. Heavy towing, dusty use, or lots of short trips may justify earlier replacement or more frequent inspections.