Parts for your 1998 Mitsubishi Lancer-Ignition leads

1998 Mitsubishi Lancer ignition leads – what they do and when to replace them

Based on technical references, ignition leads are relevant and fitted to most 1998 Mitsubishi Lancer models sold in Australia and New Zealand. The Mitsubishi Lancer CE/CK workshop manual (Engine Electrical group) details distributor-based ignition on the 4G15 and 4G93 engines, which use high-tension (HT) leads from the distributor to each spark plug. Aftermarket catalogues from NGK and Bosch also list complete HT lead sets for 1996–2000 Lancer 1.5 and 1.8 engines, confirming fitment. Note: the high-performance Lancer Evolution V/VI of the same era uses coil-on-plug ignition and doesn’t run conventional ignition leads.

On a standard 1998 Lancer, ignition leads carry the coil’s high voltage from the distributor to the spark plugs. When they’re in good nick, they deliver a strong, clean spark for easy starts, smooth idle, crisp throttle response, and decent fuel economy. When they age, the insulation can crack or go hard, and internal resistance can creep up. That’s when misfires pop up under load, the idle goes a bit lumpy, fuel use climbs, and you might see a check engine light with misfire codes.

As part of regular servicing, it’s smart to inspect the leads every service and replace them around the 80,000–100,000 km mark, or earlier if there are signs of wear. Look for oil soaking, heat hardening, burns, or green corrosion at the terminals. In the dark, a quick visual while the engine runs can show any sneaky arcing. A multimeter resistance check against the workshop spec is a solid move too.

When replacing, do one lead at a time to keep the firing order correct (commonly 1-3-4-2 on these engines). Seat each boot fully on the spark plug and distributor, and use a smear of dielectric grease to help sealing and future removal. Don’t yank on the cable—pull from the boot. It’s good practice to pair new leads with fresh spark plugs gapped to the under-bonnet spec, and to inspect the distributor cap and rotor for tracking or wear while you’re there.

Quality silicone-jacketed leads from reputable brands handle heat and vibration better and last longer. Correct routing in the factory clips matters too—keeps them off hot bits and reduces electrical crossfire between cylinders. Done right, the Lancer’s ignition stays reliable and fuss-free for years.

• Common symptoms of failing leads: hard starting, rough idle, misfire under load, poor economy, and visible arcing
• Recommended service action: inspect every service, replace ~80–100k km or at first sign of deterioration
• Check related parts: spark plugs, distributor cap and rotor, and coil tower for corrosion

FAQs

How often should ignition leads be replaced on a 1998 Lancer?
For most daily-driven cars, replacing the leads roughly every 80,000–100,000 km is a safe interval. If the vehicle sees lots of heat, short trips, or if there are misfire symptoms, replace sooner. Always inspect at each service and test resistance against the workshop spec.

What are the tell-tale signs my Lancer’s leads are on the way out?
Look for rough idle, hesitation under load, poor fuel economy, and misfire fault codes. Visually, cracked or hardened insulation, green/white corrosion at terminals, or arcing you can see at night are red flags. Moisture sensitivity—running rough after rain or a wash—is another giveaway.

Can I fit the new leads myself?
Yes, if you’re handy. Do one lead at a time, match lengths, and ensure each boot clicks onto the plug and distributor. Keep the factory routing and firing order, and add a light smear of dielectric grease to boots. If you’re unsure or the distributor cap/rotor also needs attention, a trusted mechanic can sort it quickly.