Parts for your 1989 Mitsubishi Pajero-Fuel injectors

1989 Mitsubishi Pajero fuel injectors — what they do and how to look after them

Based on factory and aftermarket references — including the Mitsubishi Pajero/Montero L040 Series Service Manual (1988–1990), Mitsubishi 4D56 Diesel Engine Service Manual, Mitsubishi 6G72 ECI‑Multi Workshop Manual, and Haynes/Gregory’s guides covering 1983–1993 Pajero — fuel injectors are relevant to many 1989 Pajero variants. The 3.0‑litre 6G72 V6 with ECI‑Multi uses electronic petrol injectors, while the 2.3/2.5‑litre 4D55/4D56 diesels use mechanical injectors fed by a rotary pump. Some 2.6‑litre 4G54 petrol models were carburetted and do not have injectors. If yours is a V6 or diesel, injectors are part of normal servicing.

On a 1989 Pajero, injectors are there to meter and atomise fuel so the engine runs cleanly and pulls strongly. Petrol ECI‑Multi injectors fire into the intake ports, coordinated by the ECU. Diesel injectors pop open at a set pressure to spray into the pre‑combustion chambers. Either way, good spray patterns mean easier starts, smoother idle, better economy and fewer smoky moments under load — too right.

Servicing is about keeping fuel clean and the spray pattern crisp. Petrol owners can plan on professional ultrasonic cleaning and flow‑testing every 80–120,000 km, or sooner if there’s rough idle, misfire or rising fuel use. Diesel owners should have pop pressures and nozzles checked around 150–200,000 km