Parts for your 1998 Mitsubishi Pajero-Ignition leads

1998 Mitsubishi Pajero ignition leads: what applies and how to look after them

Technical references including the Mitsubishi Pajero/Montero Factory Service Manual for the late-1990s models and popular workshop guides (Gregory’s/Haynes) show that ignition leads are fitted to the 1998 Pajero petrol V6s (3.0L 6G72 and many 3.5L 6G74 variants), where they connect the ignition coil or distributor/coil-pack to the spark plugs. For the 1998 Pajero 2.8L turbo-diesel (4M40), ignition leads are not used at all, because diesel engines ignite fuel by compression and rely on glow plugs for cold starts rather than a high-voltage spark system.

Where fitted on the petrol V6, the ignition leads do a simple but critical job: they carry high-voltage spark energy from the coil or distributor/coil-pack to each spark plug at precisely the right time. Good leads help the Pajero start cleanly, idle smoothly, and pull well under load. As noted in the factory manual and common workshop practice, leads are wear items. Heat, oil vapour, and engine vibration eventually harden the insulation, increase electrical resistance, and cause tiny cracks. That’s when owners see misfires on hills, a rough idle, flat spots, or even a tick-tick arcing sound in the dark.

For routine servicing on a petrol 1998 Pajero, a sensible approach is:

• Inspect leads every service for hardening, cracks, burn marks, oil contamination, or loose boots.
• Check lead routing and clip points so they don’t rub on metal, sharp edges, or the exhaust manifold.
• Test lead resistance against workshop-manual specs if a misfire is suspected.
• Replace as a complete set if one lead fails or the set looks tired.

Replacement intervals vary with quality and conditions, but many techs in Australia and New Zealand treat 60,000–100,000 kilometres as a practical window, or sooner if symptoms show. When fitting new leads, choose quality silicone-insulated, suppression-type leads to keep radio interference at bay. Install one lead at a time to maintain firing order, apply a dab of dielectric grease inside the boots for easier future removal, and push each end firmly until it seats. While there, it’s smart to check spark plugs for correct gap and condition, as weak plugs can punish new leads.

If the vehicle is a 2.8 turbo-diesel, there’s no need to look for ignition leads—the engine simply doesn’t use them. Any starting or running issues on the diesel side are more likely glow-plug, fuel, air, or sensor related rather than spark delivery.

Common signs the petrol Pajero wants new leads

• Misfire under load or in wet weather
• Rough idle and higher fuel use
• Visible arcing or white tracking lines on the insulation
• Check Engine light with ignition-misfire codes

FAQs

Do diesel 1998 Pajero models have ignition leads?
No. The 2.8L 4M40 turbo-diesel is a compression-ignition engine and doesn’t generate spark. It uses glow plugs to aid cold starting, so there are no ignition leads to service or replace.

How often should ignition leads be replaced on a 1998 Pajero petrol V6?
Many workshop schedules aim for 60,000–100,000 kilometres, but condition matters more than a number. If there’s misfiring, cracking, oil-soaking, or high resistance, a full set replacement is the go—even if the mileage is lower.

Are aftermarket “performance” leads worth it?
Quality OE-equivalent silicone suppression leads are usually the safest bet. Big “race” leads won’t add power by themselves, reliability and correct resistance/EMI suppression are what count on a road-going Pajero. Stick with reputable brands and correct lengths/routing for the engine code.