Parts for your 1989 Mitsubishi Pajero-Spark plugs

1989 Mitsubishi Pajero spark plugs — are they relevant?

Yes — if the 1989 Mitsubishi Pajero is a petrol model, it absolutely uses spark plugs. Technical sources such as the Mitsubishi Pajero/Montero L040 Series Workshop Manual (1983–1991) specify conventional spark plugs for the 2.6L 4G54 four-cylinder and the 3.0L 6G72 V6 petrol engines. In contrast, the 2.5L 4D56 turbo-diesel uses glow plugs, not spark plugs. Parts catalogues from NGK and Denso for AU/NZ vehicles back this up by listing specific spark plug part numbers for the petrol engines and glow plugs for the diesel. The under‑bonnet tune label on many local vehicles also lists the plug gap for petrol variants.

For owners of petrol 1989 Pajeros, spark plugs do the critical job of igniting the air–fuel mix in each cylinder so the engine starts cleanly, idles smoothly, and pulls well up hills without chewing through extra fuel. Fresh, correctly gapped plugs help with cold starts on frosty mornings, reduce misfires on corrugations, and keep emissions tidy. On these older Mitsi engines, keeping the spark system in good nick makes a noticeable difference to drivability.

Replacement intervals depend on plug type and how the vehicle’s used. As a guide, standard copper plugs are often changed around 20,000–30,000 kilometres, while platinum or iridium types can stretch much further (often 80,000–100,000 kilometres). Always follow the vehicle’s service schedule and the plug maker’s guidance. The correct heat range and gap are crucial