Parts for your 2003 Mitsubishi Pajero-Ignition coils

2003 Mitsubishi Pajero ignition coils: what they do, whether you’ve got them, and how to look after them

Technical sources confirm that ignition coils are fitted to 2003 Mitsubishi Pajero petrol models and are not used on the diesel. The Mitsubishi Pajero NM/NP Workshop Manual (Ignition section) details a distributorless, coil‑on‑plug setup for the V6 petrol engines (6G74/6G75), while outlining that the 3.2 Di‑D diesel (4M41) uses compression ignition with glow plugs and no ignition coil. This is consistent with Mitsubishi ASA parts information and common aftermarket catalogues (NGK/NTK and DENSO application data), which list coils for the petrol variants and none for the diesel.

For owners of the petrol V6, the Pajero’s ignition coils are the spark-makers’ best mate. Each coil takes 12‑volt battery power and steps it up to thousands of volts, firing the spark plug right when the ECU calls it. On the NP/NM petrols it’s a coil‑on‑plug arrangement, which keeps the spark strong and tidy with minimal losses through leads. If the vehicle is the 3.2 Di‑D diesel, none of this applies—there are no ignition coils because diesel fuels ignite from heat of compression rather than a spark.

As part of regular servicing on a 2003 Pajero petrol, it’s smart to give the coils and plugs a bit of attention. Coils live in a hot spot on top of the rocker covers, on the rear bank, access often means removing the upper intake plenum, so plan a gasket set and take your time. When replacing spark plugs (typically around 90,000–100,000 km, or earlier if they’re tired), inspect each coil boot for hardening, tracking marks or oil contamination from rocker cover leaks. A tiny smear of dielectric grease inside each boot helps future removal and keeps moisture at bay.

Common signs a coil is on the way out include:

• Rough idle, hesitation under load, or a misfire light (codes P0300–P0306)
• Higher fuel use and a whiff of raw fuel from the exhaust
• Hard starts or a persistent stumble when it’s wet

Coils can be replaced one at a time, but on high‑kilometre engines many techs prefer doing the set—especially if multiple are weak. Stick with quality OEM‑equivalent parts, keep battery voltage healthy, and avoid blasting the engine bay with high‑pressure water. A clean, dry coil connection and the right plug gap will keep the V6 running sweet across long Kiwi and Aussie road trips.

Popular questions about 2003 Mitsubishi Pajero ignition coils

Do all 2003 Pajeros have ignition coils?
Petrol V6 models do, the 3.2 Di‑D diesel does not. The diesel relies on compression ignition and glow plugs for cold starts, so there are no ignition coils to service or replace. If unsure, check the build plate or engine code—6G74/6G75 are petrol, 4M41 is diesel.

How often should ignition coils be checked or replaced?
There’s no strict interval to replace coils pre‑emptively. Inspect them whenever you do spark plugs (around 90,000–100,000 km) or if there’s a misfire. Replace any coil showing cracks, tracking, swollen boots, oil contamination, or if scan data and swapping tests confirm a faulty unit.

Can a bad coil damage the catalytic converter?
Yes. A persistent misfire can dump unburnt fuel into the exhaust, overheating and harming the cat. If the Pajero starts missing under load or the MIL is flashing, it’s best to sort the coil and plug issue promptly to protect the exhaust system.