Parts for your 2007 Nissan Navara-Spark plugs

2007 Nissan Navara spark plugs — what’s fitted and how to look after them

According to Nissan’s D40 Navara Owner’s Manual (2007 AU/NZ), the D40 Factory Service Manual, and Nissan’s global parts catalogue, a 2007 Navara may or may not have spark plugs depending on the engine. The 4.0‑litre V6 petrol (VQ40DE) uses spark plugs as part of its coil‑on‑plug ignition system, while the 2.5‑litre turbo‑diesel (YD25DDTi) does not use spark plugs at all, relying on compression ignition and glow plugs for cold starts. That’s why some 2007 Navaras will have spark plugs and others won’t — it comes down to whether it’s a petrol or diesel.

If it’s the diesel: spark plugs aren’t used because diesel engines ignite the air‑fuel mix by heat from compression rather than an electric spark. The YD25DDTi instead uses glow plugs to pre‑heat the combustion chamber for easier cold starts, which is why “spark plugs” aren’t a service item on those models (this is documented in the diesel engine section of the D40 Service Manual).

For the V6 petrol Navara, spark plugs are critical. Each plug delivers a timed spark to ignite the fuel‑air mix in its cylinder, giving the engine smooth power, decent fuel economy and clean emissions. Over time, even iridium or platinum plugs wear: electrode edges round off, gaps can widen, and carbon or oil fouling can build up, all of which can cause a rough idle, misfires under load, hard starting, or higher fuel use.

As part of routine servicing, it’s smart to inspect or replace the spark plugs at the intervals specified in the Owner’s Manual. Many VQ40DE vehicles run long‑life iridium plugs with extended change intervals, often around the 100,000 km mark under normal conditions, but vehicles that tow, idle for long periods, or work in dusty conditions can benefit from earlier checks. Always replace the full set, stick with the correct heat range and plug type specified by Nissan, and confirm the gap if the plugs aren’t pre‑gapped. When fitting, use a torque wrench and follow the factory torque spec to avoid damaging threads or under‑tightening. It’s also worth checking the coil boots for cracks and the plug tubes for oil — a leaking rocker cover gasket can shorten plug life.

Owners who keep on top of plug maintenance generally notice smoother running, easier starts on cold mornings, and more consistent fuel economy. If the Navara hesitates on hills, stumbles at idle, or flashes a check‑engine light for a misfire code, fresh plugs are a cheap, quick win before chasing more complex faults.

• Best practice: use OEM‑equivalent iridium plugs and replace as a complete set.
• Good clues to check early: rough idle, hard starting, poor fuel economy, or misfire codes.
• Always follow the D40 Service Manual for gap, torque and removal/installation steps.

Popular questions about 2007 Navara spark plugs

Does every 2007 Navara have spark plugs?
No. Petrol V6 models (VQ40DE) have spark plugs. The common 2.5 turbo‑diesel (YD25DDTi) does not use spark plugs, it uses glow plugs and compression ignition. This split is clear in the D40 Owner’s Manual and the Factory Service Manual sections for petrol vs diesel engines.

How often should spark plugs be replaced on the V6 petrol Navara?
Nissan specifies extended intervals for the long‑life plugs used in the VQ40DE — often around 100,000 km under normal conditions. If the ute tows frequently, sees a lot of short trips, or runs in dusty conditions, earlier inspection is a good idea. Always use the plug type and torque values specified in the manual.

What are the signs the spark plugs need attention?
Common symptoms include a lumpy idle, hesitation under load, increased fuel use, hard starting and misfire fault codes. Pulling one or two plugs for a look can reveal worn electrodes or fouling, if one is tired, plan on replacing the full set.