Parts for your 2006 Mitsubishi Lancer-Ignition leads

2006 Mitsubishi Lancer ignition leads — fitment, purpose and servicing tips

Based on technical sources, ignition leads are fitted to most 2006 Mitsubishi Lancer CH models with the 2.0L 4G94 engine, which runs a distributorless, wasted-spark coil pack and high-tension (HT) leads. This configuration is documented in the Mitsubishi CH Lancer Service Manual (Ignition System section) and reflected in major aftermarket parts catalogues from NGK, Bosch and Top Gun that list complete lead sets for 2002–2007 CH 2.0L models. Some 2006 Lancer variants with the 2.4L 4G69 MIVEC (e.g., VRX/Ralliart) use coil-on-plug ignition, as noted in Mitsubishi workshop information and OE parts listings, so they don’t have traditional ignition leads. If unsure, check your build plate/engine code or look for a coil pack and four HT leads across the rocker cover.

For CH Lancer owners with the 2.0L 4G94, the ignition leads do an unglamorous but crucial job: they carry high voltage from the coil pack to the spark plugs, delivering a strong spark right when the ECU calls for it. Good leads mean clean starts, smooth idle and decent fuel economy. Tired leads leak energy, so the spark gets weak or jumps to earth, which shows up as misfires under load, rough running, and higher fuel use.

As part of regular servicing, it’s smart to inspect the leads every service interval and replace them roughly every 80,000–100,000 km or about five years, sooner if you’re seeing symptoms. Look for hard or brittle insulation, cracking, green corrosion in the terminals, oil soaking, or burn marks. In the dark, faint blue arcing around the leads is a tell-tale sign they’re done.

When replacing, go with a quality set that matches the 4G94 engine length and resistance spec. Fit one lead at a time to keep the firing order spot on. Push each boot firmly until it clicks on the plug or coil tower, and route the leads in the factory clips so they don’t sit on hot metal or rub through. A touch of dielectric grease inside the boots helps future removal and keeps moisture out. Pair new leads with fresh spark plugs gapped to spec and you’ll get the best result.

• Common symptoms of worn leads: hard starting, rough idle, hesitation climbing hills, flashing MIL with P0300–P0304 codes, and increased fuel use.
• Avoid yanking on the wire — always pull from the boot. Keep them clean and free of oil to extend life.

FAQs

How often should ignition leads be replaced on a 2006 Lancer?
Under typical Aussie and Kiwi conditions, plan on every 80,000–100,000 km or five years. Inspect at each service and replace sooner if you notice misfires, cracking or arcing. Harsh heat, lots of short trips, or oil contamination will shorten their life.

What are the signs my Lancer’s ignition leads are failing?
Rough idle, missing under load, poor fuel economy, or a check engine light with random or cylinder-specific misfire codes (P0300–P0304). Visually, you might spot brittle insulation, green corrosion at terminals, or see arcing in the dark.

Does every 2006 Lancer use ignition leads?
No. The common 2.0L 4G94 CH uses a coil pack and HT leads. The 2.4L 4G69 MIVEC VRX/Ralliart typically uses coil-on-plug ignition with no traditional leads. A quick look under the bonnet will confirm which system you have.