Parts for your 2002 Toyota Land cruiser-Spark plugs

2002 Toyota Land Cruiser spark plugs: what’s fitted and how to look after them

Based on Toyota technical literature for the 100 Series (Owner’s Manual and Repair Manual) and major plug catalogues from Denso and NGK, the 2002 Toyota Land Cruiser was sold with two very different engines. The 4.7‑litre 2UZ‑FE petrol V8 uses eight spark plugs (iridium type, 1.1 mm gap), while the 4.2‑litre 1HD‑FTE turbodiesel does not use spark plugs at all, relying on compression ignition and glow plugs for cold starts. So spark plugs are fully relevant to 2002 petrol Land Cruisers (UZJ100), but not to the diesel HDJ100.

For vehicles fitted with the 2UZ‑FE petrol V8, spark plugs do the critical job of igniting the air‑fuel mix in each cylinder, ensuring smooth idle, solid torque and clean emissions. Toyota specifies long‑life iridium plugs (commonly Denso SK20R11 or NGK IFR6A11) gapped to 1.1 mm. With coil‑on‑plug ignition, each cylinder gets a strong, precise spark, which is why the V8 feels so tractable on road and dependable off‑road.

For servicing in Australia and New Zealand, most workshops aim to replace the iridium plugs around 120,000–160,000 km, factoring in local fuel quality and usage. It’s smart to inspect them every 40,000–60,000 km: check the insulator for tracking, the tip for excessive wear, and the threads for signs of overheating. Typical symptoms of tired plugs include rough idle, a slight miss under load, harder cold starts, and higher fuel use.

When replacing, quality matters. Stick with the correct heat range and reach, mixing types can upset combustion and increase knock. Torque the plugs to about 25 N·m on the alloy heads to ensure proper sealing without stretching threads. Don’t use anti‑seize on modern nickel‑plated plug threads unless the plug maker explicitly says so—over‑lubed threads can cause over‑torque. A dab of dielectric grease inside each coil boot helps prevent moisture ingress and eases future removal.

Access on the 2UZ‑FE is straightforward with a 5/8 in (16 mm) spark plug socket, small extensions and a torque wrench. Work with a cool engine, blow out plug wells before removal, and replace any cracked coil boots. Done right, fresh iridium plugs help the 100 Series V8 start crisply, pull cleanly up long hills, and sip less fuel—ideal whether it’s towing, touring, or daily duties.

• Relevant technical sources: Toyota 100 Series Owner’s and Repair Manuals (UZJ100/HDJ100), Denso and NGK fitment catalogues for 2002 UZJ100 2UZ‑FE.

Popular questions

What spark plugs does a 2002 Land Cruiser V8 use?

The 4.7‑litre 2UZ‑FE typically uses iridium plugs such as Denso SK20R11 or NGK IFR6A11, gapped to 1.1 mm. There are eight plugs—one per cylinder—with coil‑on‑plug ignition. Sticking to the OEM spec heat range and reach keeps combustion stable and helps the V8 deliver its trademark smoothness and reliability.

How often should spark plugs be replaced on the 2UZ‑FE in Australia/NZ?

Iridium plugs are long‑life parts. Many workshops target 120,000–160,000 km for replacement, with inspections every 40,000–60,000 km. Heavy towing, dusty touring, or lots of short trips may justify bringing that interval forward to keep starts clean and fuel use in check.

My 2002 Land Cruiser is a diesel—does it have spark plugs?

No. The 1HD‑FTE turbodiesel uses compression ignition and glow plugs for cold starting, so spark plugs aren’t fitted or required. If cold starts are sluggish on a diesel, look at glow plugs, the glow circuit, battery health, and injector condition instead.