Parts for your 2021 Mitsubishi Eclipse cross-Spark plugs

2021 Mitsubishi Eclipse Cross — Spark Plugs

Yes, spark plugs are absolutely relevant on the 2021 Mitsubishi Eclipse Cross. Technical references such as the Mitsubishi Motors Owner’s Manual and the scheduled maintenance guide for the 2021 model list spark plug inspection/replacement, and major application catalogues from NGK and Denso specify iridium plugs for both the 1.5‑litre MIVEC turbo petrol and the 2.4‑litre petrol engine used in the Eclipse Cross PHEV. Being spark‑ignition petrol engines, they rely on spark plugs to fire the air–fuel mix.

On this model, the plugs sit beneath coil‑on‑plug ignition units and provide a precise, hot spark that keeps combustion clean and efficient. Good plugs help the Eclipse Cross start crisply on cold mornings, deliver smooth power under boost, keep fuel economy in check, and minimise emissions. Because turbocharged and direct‑injection engines run higher cylinder pressures, the condition and spec of the plugs matter even more.

As part of routine servicing, it’s smart to check plug condition and performance. Factory iridium plugs are long‑life items, and in many service schedules they’re due around the high‑kilometre mark (often in the 90,000–100,000 km range), though some market schedules for turbo engines call for earlier changes (for example, about 60,000 km). Follow the interval, plug type and gap specified in the vehicle handbook or service schedule. If the engine shows symptoms like rough idle, hesitation under load, increased fuel use, hard starting, or a check‑engine light for misfire, bring replacement forward.

• Always fit a full matched set of OEM or OEM‑equivalent iridium plugs with the correct reach, heat range and electrode design.
• Don’t force‑gap fine‑wire iridium plugs unless the manufacturer specifically allows it, protect the centre electrode.
• Install on a cool engine, blow out plug wells before removal, avoid debris entering the cylinders.
• Torque to the spec in the workshop manual and avoid anti‑seize on nickel‑plated threads (it can lead to over‑tightening).
• Inspect coil boots and replace any brittle or oil‑soaked parts, a light smear of dielectric grease can help seal the boots.

Keeping the Eclipse Cross on fresh, correctly‑specified plugs helps maintain strong performance, smooth refinement and reliable fuel economy, while protecting coils and the catalytic converter from damage caused by persistent misfires.

Popular questions about 2021 Mitsubishi Eclipse Cross spark plugs

Does the 2021 Mitsubishi Eclipse Cross use spark plugs?
Yes. Both the 1.5‑litre MIVEC turbo petrol and the 2.4‑litre petrol in the Eclipse Cross PHEV use spark plugs, as indicated in Mitsubishi’s owner’s manual and service schedules.

How often should the spark plugs be replaced?
Follow the interval in the handbook. Many factory iridium plugs are scheduled around 90,000–100,000 km, but some turbo service programmes specify earlier intervals (about 60,000 km). Replace sooner if there are misfires, hard starts or poor fuel economy.

What type of spark plug should be used?
Use the Mitsubishi‑specified iridium plugs with the exact heat range, reach and gap noted in the manual or under‑bonnet label. OEM plugs and reputable equivalents from brands like NGK and Denso that meet the Mitsubishi spec are suitable.