Parts for your 1988 Mitsubishi Pajero-Maf sensor

1988 Mitsubishi Pajero MAF sensor: what’s fitted and what to service

Based on factory literature and parts catalogues, whether a 1988 Mitsubishi Pajero uses a mass air flow (MAF) sensor depends on the engine fitted. The Mitsubishi Pajero/Montero Factory Service Manual for the late-1980s models (Fuel and Emissions sections), the 6G72 V6 EFI engine manual, and Mitsubishi’s ASA electronic parts catalogue show an airflow meter (Kármán‑vortex type) on EFI petrol variants, particularly the 3.0‑litre V6 introduced around 1988. Conversely, the 2.6‑litre 4G54 petrol models were typically carburetted, and the 2.5‑litre 4D56 turbo‑diesel used a fully mechanical injection pump—neither system employs a MAF sensor.

Why no MAF on many 1988 Pajeros? Carburetted petrol engines meter fuel mechanically via the carb, and the 4D56 diesel manages fuelling mechanically inside the rotary pump with a boost compensator, there’s no ECU to interpret airflow data. The EFI V6 is the exception, using an airflow meter so the ECU can precisely meter fuel.

For Pajeros fitted with the EFI 3.0 V6 and an airflow meter, the MAF’s job is to measure the volume of air entering the engine so the ECU can calculate fuel delivery, ignition timing, and idle control. On these late‑’80s Mitsubishis it’s a Kármán‑vortex type sensor mounted in the intake duct near the airbox under the bonnet. A faulty or dirty meter can cause hard starting, rough idle, hesitation on take‑off, flat spots, poor fuel economy, excessive fuel smell, or a check‑engine light with airflow‑related fault codes (blink codes on these pre‑OBD systems).

There’s no fixed replacement interval—treat the MAF as “inspect and service”. Each service where the air filter is checked (about every 10,000–20,000 km in typical Aussie and Kiwi conditions), give the airflow meter a quick once‑over:

• Inspect the intake ducting for cracks and loose clamps that can let unmetered air in.
• Check the connector for green crusties or loose pins, clean and reseat.
• If drivability’s gone to custard, remove the meter and clean it with proper MAF or electronics cleaner—no brake cleaner, no touching the sensing elements, and no compressed air. Let it dry fully before refitting.
• Avoid oiled filters, excess oil can foul the sensing path and screens.
• If faults persist, test the sensor’s frequency output per the factory manual, and rule out vacuum leaks before condemning the meter.

When replacement is necessary, stick to genuine or quality aftermarket units that match the original Kármán‑vortex spec. A cheap, incorrect meter can cause more grief than it solves. Fitment is straightforward with basic spanners: two clamps, an electrical plug, and a careful refit to avoid air leaks. After replacement, clear fault memory and take it for a gentle drive so the ECU can relearn trims.

Popular questions about 1988 Mitsubishi Pajero MAF sensors

Does every 1988 Pajero have a MAF sensor?
Not all of them. Carburetted 2.6‑litre petrol and 2.5‑litre 4D56 diesel models don’t use a MAF because fuelling is mechanical. EFI 3.0‑litre V6 variants do use an airflow meter to feed the ECU the data it needs for precise fuelling.

Where is the MAF sensor on the 3.0 V6 Pajero?
It’s fitted in the intake tract near the air cleaner box, upstream of the throttle body, under the bonnet on the driver’s side (RHD markets). You’ll see it as a housing in the intake snorkel with an electrical connector and mesh screens.

Can a 1988 Pajero MAF be cleaned, or should it be replaced?
Cleaning is often effective. Use dedicated MAF/electronics cleaner, don’t touch the sensing elements, and let it air‑dry. If symptoms remain after checking for air leaks and wiring issues, testing per the factory manual will confirm if replacement is warranted.