Pajero IV: Flickering Check Engine Light and Rough Idle — What It Means

A flickering light is not the same as a steady one

If your Pajero IV has a check engine light that flickers or flashes while the idle stumbles, take it seriously. A steady light generally means the ECU has stored a fault and is asking you to get it looked at soon. A flashing or flickering light almost always means an active misfire — one or more cylinders are not burning fuel properly right now. Unburnt fuel gets pushed into the catalytic converter, where it burns far too hot. Left alone, that can melt or clog a cat, and on a Pajero that is an expensive part to replace. So the quick answer to your question: it is usually safe to limp gently to a workshop, but avoid hard acceleration, towing and long highway runs until it is fixed.

The usual suspects on this model

On the Pajero IV, rough idle with a misfire code (P0300 through P0306) is most often ignition or air-related. Ranked roughly by how often we see them in the shop:

• Spark plugs and coil packs — the 3.8 V6 (6G75) and 3.0 V6 (6G72) run coil-on-plug ignition. A cracked coil or a plug worn past its gap causes a dead miss at idle that smooths out at revs. Plugs are cheap; do them first.
• Vacuum and intake leaks — perished hoses, a split intake boot or a leaking manifold gasket lean out the mixture and roughen the idle.
• Dirty mass airflow sensor — an oily or dusty MAF under-reports air, so the ECU fuels wrong. Clean it with dedicated MAF spray, never carb cleaner.
• Carboned-up throttle body — very common on the 3.2 DiD (4M41) and V6 engines. A gummy throttle plate makes idle hunt and stumble. Clean it and perform a throttle relearn afterwards.
• Fuel side — clogged injectors, weak fuel pressure, or on the diesel, a tired suction control valve and dirty fuel filter.
• EGR valve stuck open — dumps exhaust gas into the intake at idle and makes it run rough.
• Crank or cam position sensor — a failing sensor can cut spark intermittently and cause the light to flicker in time with the stumble.

What to check first, in order

Do not throw parts at it. Start with a scan tool — the Pajero IV is OBD-II compliant, so a basic reader will pull the P-codes, though a dealer-level MUT-III tool reads more on the diesel. Read the stored codes and the freeze-frame data, then check live misfire counters per cylinder: that single step tells you whether it is one cylinder or all of them. One cylinder points to a coil or injector; all cylinders points to air, fuel pressure or a sensor. After that, pull the plugs and read their colour, inspect coil boots for carbon tracking, then smoke-test the intake for leaks. Clean the MAF and throttle body as routine maintenance while you are in there, and only then move on to fuel pressure and injector testing.

Is it safe to keep driving?

If the light is steady and the idle is only slightly rough, you can usually drive on gently and book it in within a few days — but fuel economy will suffer and the fault will not fix itself. If the light is flickering or flashing, treat it as a warning to stop pushing the car: drive it softly and directly to a workshop, or have it towed if the engine shakes badly, loses power or starts stalling. Continuing to drive hard with a flashing light is the fastest way to turn a hundred-dollar coil into a thousand-dollar catalytic converter.

This material is AI-generated and for informational purposes only — it does not replace an in-person diagnosis by a qualified mechanic.