Parts for your 2005 Mitsubishi Pajero-Spark plugs

2005 Mitsubishi Pajero spark plugs — are they used, and what to do about them

For a 2005 Mitsubishi Pajero, whether spark plugs are relevant comes down to the engine. The petrol V6 models (3.8L 6G75 and, in some markets, the late 3.5L 6G74) use spark plugs — one per cylinder, so six in total. The 3.2L DI‑D turbo‑diesel (4M41) does not use spark plugs, it’s a compression‑ignition engine that relies on glow plugs for cold starts. This split is confirmed in Mitsubishi’s Pajero NM/NP Workshop Manual and 2005 Owner’s Manual, and mirrored by plug catalogues from major suppliers for the petrol V6 and glow‑plug listings for the diesel.

On petrol Pajeros, spark plugs do the essential job of igniting the air–fuel mix in each cylinder. Good plugs help the V6 start crisply, idle smoothly, and pull strongly — and they keep fuel economy on the right side of the ledger. Mitsubishi’s service information for the 2005 petrol V6 specifies long‑life iridium plugs and a replacement interval around 90,000–100,000 km in normal conditions, always check the owner’s handbook for your exact schedule and plug spec. Authoritative plug catalogues for the 6G75 back this up with iridium part numbers and a factory set gap that shouldn’t be tweaked.

For day‑to‑day care, the smart play is to replace all six plugs as a set, use the correct heat range, and fit them with a torque wrench to the specification in the manual. The tight rear bank under the intake plenum can be fiddly, a 16 mm (5/8") spark‑plug socket, wobble extension and patience go a long way. While you’re there, inspect coil boots for tracking, and consider new boots if they’re hardened or cracked.

• Watch for tell‑tales of tired plugs: rough idle, sluggish take‑off, higher fuel use, or a misfire light.
• Stick with quality iridium plugs, they last longer and hold gap better in Aussie and Kiwi stop‑start traffic and towing.
• Don’t regap iridium tips — they’re factory set. If the gap’s off, replace the plug.
• If the vehicle spends time off‑road or towing, shorten inspection intervals, dust and heat are harder on ignition parts.

Diesel 3.2 DI‑D owners won’t find spark plugs under the bonnet because the engine ignites fuel by compression. Instead, it uses glow plugs purely to aid cold starts — a different system with its own checks and replacement schedule (as per Mitsubishi’s workshop guidance).

Popular questions about 2005 Mitsubishi Pajero spark plugs

How often should spark plugs be replaced on a 2005 Pajero petrol V6?
Mitsubishi’s guidance for the petrol 6G75 V6 is long‑life iridium plugs at roughly 90,000–100,000 km under normal use. If the Pajero tows, does lots of short trips, or works in dusty conditions, have them inspected earlier during routine servicing. Always match the exact interval and plug spec to the owner’s manual.

What spark plug type is correct for the 2005 Pajero petrol?
The petrol V6 uses iridium plugs with the factory‑specified heat range and pre‑set gap listed in the owner’s manual and reputable AU/NZ parts catalogues. Avoid mixing types or heat ranges, and replace all six at once for consistent performance.

Do diesel 2005 Pajeros have spark plugs?
No. The 3.2 DI‑D diesel is a compression‑ignition engine and uses glow plugs only for cold starting. If starting becomes sluggish in cold weather, have the glow plugs and the glow control system checked rather than looking for spark plugs.