Parts for your 2007 Mitsubishi Lancer-Spark plugs

2007 Mitsubishi Lancer Spark Plugs

Per Mitsubishi service literature and owner’s manuals for 2007 Lancer petrol variants, spark plugs are a specified, routine service item. Only the rare diesel variants offered in some markets use glow plugs instead, not spark plugs. For the petrol-powered 2007 Lancer common in Australia and New Zealand, spark plugs are absolutely relevant.

On a 2007 Mitsubishi Lancer, spark plugs ignite the compressed air–fuel mix to keep the engine running smoothly, delivering decent fuel economy, easy starts and crisp throttle response. These cars typically run coil-on-plug ignition, so each cylinder gets precise spark timing and strong voltage, and quality iridium plugs help it all stay reliable for years.

As part of regular servicing, it’s smart to check plug condition and plan replacement on time. Most 2007 Lancers left the factory with long-life iridium plugs. In normal Aussie and Kiwi conditions, expect around 90,000–100,000 km between changes, in harsher use (lots of short trips, dusty roads, frequent towing), bring that down to about 60,000–80,000 km. If a previous owner fitted conventional nickel plugs, aim for roughly 30,000–40,000 km. Always follow the handbook or factory schedule for the exact engine fitted.

Signs the plugs are due include a rough idle, sluggish take-off, increased fuel use, misfire under load or a hard-to-start cold morning. Replacing them before these symptoms appear usually saves fuel and keeps the catalytic converter happy.

When fitting new plugs, stick with the correct OEM-spec heat range and reach, and use pre-gapped iridium/platinum plugs set to the factory spec. Don’t crank the gap wider or narrower unless the manufacturer allows it. Install into a cool engine, blow away grit around the wells, and torque to the car’s spec (typically around 18–25 Nm for many alloy-head, gasket-seat plugs—check the exact figure for the engine). Most modern plugs are nickel-plated, so skip anti-seize, it can lead to over-tightening. A tiny smear of dielectric grease on the coil boot helps future removal and keeps moisture at bay.

• Have plugs inspected at major services (about every 30,000 km).
• Replace coils or boots if there’s tracking, cracking or oil contamination.
• If your Lancer is a diesel variant, it uses glow plugs—not spark plugs.

Sorted on time, the Lancer’s spark plugs are a small cost that pays back with smoother running and better economy.

Popular questions about 2007 Mitsubishi Lancer spark plugs

What type of spark plug suits a 2007 Lancer?
Use OEM-equivalent iridium plugs matched to your exact engine code and heat range. Quality brands (e.g., NGK, Denso) with the correct reach, thread and projected tip keep combustion reliable and coils happy. Check the owner’s manual or under-bonnet label for the correct spec.

How often should they be replaced in Australia or New Zealand?
For factory-style iridium plugs, plan 90,000–100,000 km in typical conditions, or 60,000–80,000 km if you do lots of short trips or drive in dust and heat. If conventional plugs are fitted, target 30,000–40,000 km. Always defer to the schedule for your specific engine.

Can a home mechanic change the plugs?
Yes, with care. Allow the engine to cool, remove the engine cover, unplug and unbolt each coil, blow out the wells, and use a proper spark plug socket. Fit the new plugs to the correct torque and refit coils. If unsure—or if any plug feels tight when removing—get a pro to avoid thread damage.