Parts for your 2018 Toyota Hilux-Spark plugs

2018 Toyota HiLux spark plugs: what’s fitted and how to look after them

Based on Toyota Australia’s 2018 HiLux specifications, Owner’s Manual guidance and Toyota service literature, spark plugs are only relevant to the petrol 2.7‑litre (2TR‑FE) HiLux. The widely sold 2.8‑litre and 2.4‑litre turbo‑diesels (1GD‑FTV/2GD‑FTV) are compression‑ignition engines and don’t use spark plugs, they use glow plugs to assist cold starts. That means spark plugs will not be used on diesel 2018 HiLux models, but are absolutely fitted on the 2.7‑litre petrol.

For diesel owners: spark plugs aren’t used because a diesel ignites its fuel by compressing air until it’s hot enough for combustion. Glow plugs pre‑warm the combustion chamber to help starting, but there’s no spark system. Toyota’s engine documentation for the 1GD/2GD family confirms this compression‑ignition design and glow‑plug use.

For 2.7‑litre petrol owners: the 2018 HiLux runs coil‑on‑plug ignition with long‑life iridium spark plugs. These little plugs ignite the air–fuel mix thousands of times a minute, keeping the ute smooth, efficient and easy to start. Fresh, correctly gapped plugs help with fuel economy, throttle response and emissions, and they protect the catalytic converter by ensuring clean burns.

As part of regular servicing, it’s smart to inspect or replace the plugs at the interval shown in the Owner’s Manual. For iridium types in the 2TR‑FE, most schedules land around the 100,000–120,000 km mark under normal conditions, harder use (heavy towing, dusty sites, lots of short trips) can justify earlier checks. Always match the OEM‑specification iridium part number and heat range.

• Watch for tell‑tales of worn plugs: rough idle, sluggish take‑off, increased fuel use, hard starts, or a flashing MIL/misfire code.
• When replacing, work on a cool engine. Blow out dust from the plug wells, remove coils carefully, and thread plugs by hand before tightening to the specified torque.
• Don’t use anti‑seize on modern plated plugs unless the plug maker explicitly says so. It can alter torque and seating.
• Inspect coil boots for cracks or oil. Replace any suspect coil‑on‑plug units to avoid recurrent misfires.

For ute owners bouncing between site and surf, keeping the ignition system healthy is cheap insurance. A quality set of OEM‑grade iridium plugs, installed correctly and checked at sensible intervals, keeps the 2.7 petrol HiLux starting first go and running sweet for the long haul across Aussie and Kiwi kilometres.

Popular questions about 2018 Toyota HiLux spark plugs

Do all 2018 HiLux models have spark plugs?
No. Only the 2.7‑litre petrol uses spark plugs. The 2.8‑litre and 2.4‑litre turbo‑diesels don’t use spark plugs, they use glow plugs for cold starting because they’re compression‑ignition engines.

How often should spark plugs be replaced on a 2018 HiLux 2.7 petrol?
With OEM iridium plugs, many schedules land around 100,000–120,000 km. If the vehicle tows, idles a lot, or works in dusty conditions, earlier inspection is wise. Always follow the interval in the Owner’s Manual for the exact variant.

What symptoms point to worn spark plugs or coils?
Rough idle, sluggish acceleration, increased fuel use, hard starting, or a check engine light with misfire codes are common. If symptoms persist after new plugs, check the coil‑on‑plug units and plug boots.