Parts for your 1988 Mitsubishi Pajero-Fuel injectors

1988 Mitsubishi Pajero Fuel Injectors

Based on Mitsubishi’s factory service manual for first‑generation Pajero, the Mitsubishi ASA electronic parts catalogue, and well‑known workshop manuals used in AU/NZ, fuel injectors are relevant to the 1988 Mitsubishi Pajero. Diesel variants (4D55/4D56) use mechanical injectors, and many petrol V6 models (3.0L 6G72) run ECI‑Multi electronic fuel injection. Some 4‑cylinder petrols were carburetted, so whether injectors are fitted depends on the engine code and market.

For 1988 Pajeros fitted with injectors, the part’s job is simple but critical: meter and atomise fuel so it burns cleanly and efficiently. On the diesel 4D55/4D56, each injector pops open at a set pressure from the inline or rotary pump and sprays into the pre‑combustion chamber. On the EFI 6G72 V6, the ECU pulses each injector on the rail (ECI‑Multi), adjusting delivery for load, temp and throttle. When they’re healthy, starting is crisp, idle is smooth and fuel economy stays respectable whether it’s school‑run duties or a sandy weekend escape.

Service is mostly about clean fuel and regular checks. For diesel Pajeros, replace the fuel filter about every 10,000–20,000 km, drain the water trap, and have the injectors pop‑tested and spray‑pattern checked around 100,000–120,000 km by a diesel specialist. Nozzles commonly need overhaul somewhere between 200,000 and 250,000 km, depending on fuel quality and use. For the EFI V6, stick to fresh filters, run quality 95 RON or better if specified, and consider ultrasonic cleaning and flow testing of the injectors at roughly 100,000–150,000 km. O‑rings and insulators are cheap—replace them any time an injector is disturbed to avoid vacuum leaks or seepage.

Signs it’s time to sort the injectors include:

• Hard starting, rough idle or a misfire under light throttle
• Black smoke (rich), grey/white haze (diesel poor atomisation), or a strong fuel smell
• Knock/rattle under load (diesel), sluggish throttle response, or rising fuel use

DIYers should depressurise the system (EFI), disconnect the battery, label lines, and keep everything spotless. Diesel hard lines are high pressure—use proper flare spanners and never crank the engine with lines loose. Refit with new sealing washers as specified and always set injector opening pressure to the figure in the Mitsubishi FSM for your exact engine. If in doubt, a reputable injector or diesel pump shop will test, balance and reseal the lot, saving guesswork and keeping the old Paj honest for many more kilometres.

FAQs

Does my 1988 Pajero actually have fuel injectors?
Many do. All 4D55/4D56 diesels have mechanical injectors. The 3.0L V6 (6G72) in many markets runs ECI‑Multi EFI with injectors. Some 2.6L/2.0L petrols were carburetted and won’t have injectors. Check the engine code on the compliance plate, or look under the bonnet for a fuel rail and wiring to each intake port (EFI) versus a carburettor on a manifold (no injectors).

How often should Pajero injectors be serviced?
Diesel: fuel filter every 10,000–20,000 km, water trap as needed, pop‑test and pattern check around 100,000–120,000 km, and plan for nozzle overhaul near 200,000–250,000 km. EFI petrol: keep filters fresh, use quality fuel, and consider professional cleaning/flow testing at about 100,000–150,000 km, sooner if there are drivability issues.

Can clogged injectors damage the engine or pump?
Left unchecked, poor atomisation can raise EGTs, wash cylinder walls, foul plugs (petrol), or stress the diesel pump and turbo by running off‑song. Sorting injectors early prevents bigger dramas and usually pays back in smoother running and better economy.