Parts for your 1987 Mitsubishi Pajero-Maf sensor

1987 Mitsubishi Pajero MAF sensor — is it fitted, and what to know

Chasing a mass air flow (MAF) sensor for a 1987 Mitsubishi Pajero? Here’s the straight answer: that model doesn’t use a MAF sensor. First‑gen Pajero (1982–1991), including 1987 build years, ran carburetted petrol engines (like the 2.6L 4G54) and mechanically injected diesels (4D55 2.3L and 4D56 2.5L). Neither system requires a MAF. That’s backed by factory literature and parts listings:

• Mitsubishi Pajero/Montero Factory Service Manual (1983–1991), Group 13 Fuel: carburettor on 4G54, mechanical injection on 4D55/4D56, no mass air flow metering.
• Mitsubishi ASA electronic parts catalogue for L040/L141 (1987): no MAF/airflow meter assemblies listed for these engines.
• Haynes and Gregory’s service manuals covering 1983–1991 models note carburetted petrol until later EFI variants arrived, no MAF on 1987 spec.

Why isn’t there a MAF? A MAF sensor is part of electronic fuel injection (EFI) systems where the ECU needs to know exactly how much air is entering the engine. In a 1987 Pajero petrol, the carburettor meters fuel mechanically using venturi vacuum and jets — there’s no ECU to read a MAF. In the diesels of the same era, a mechanically governed pump controls fuelling, often with a boost compensator on turbo models, again, no ECU and no need to measure intake air mass electronically.

If someone’s told you to replace a MAF on a 1987 Pajero, they’re likely mixing it up with later Pajero models (late ’80s/early ’90s EFI variants, especially the 3.0L V6 6G72 MPFI) which used an airflow meter (Mitsubishi commonly used a Karman‑vortex style meter on EFI cars of that era). On a ’87, typical intake‑side service items are the air filter, carb tune/clean (petrol), intake hoses, and on diesels, boost and induction plumbing checks.

For owners keeping a 1987 Pajero happy, focus on:

• Fresh air filter at recommended intervals (more often if it lives off‑road).
• Vacuum hose integrity and intake ducting — no splits, clamps tight.
• Carburettor maintenance or diesel pump/boost compensator checks by a specialist if running issues pop up.

FAQs

Does a 1987 Mitsubishi Pajero have a MAF sensor?
No. The 1987 models are carburetted petrol or mechanically injected diesel, so there’s no MAF sensor fitted from factory.

What does it use instead of a MAF?
The petrol versions use a carburettor to meter fuel via venturi vacuum, and the diesels use a mechanical injection pump (with a boost compensator on turbo versions). There’s no ECU demanding an airflow signal.

Can a later Pajero MAF be retrofitted to a 1987 model?
Not practically. Retrofitting a MAF would require a full EFI conversion — ECU, sensors, wiring, fuel system changes, and suitable intake hardware. It’s far more involved than a simple sensor swap.