Parts for your 2008 Mitsubishi Outlander-Ignition leads

2008 Mitsubishi Outlander ignition leads: are they fitted?

For the 2008 Mitsubishi Outlander, traditional ignition leads (high-tension spark plug leads) are not used. The Outlander’s petrol engines of that era—2.0L 4B11, 2.4L 4B12, and 3.0L V6 6B31—run a coil-on-plug (COP) ignition system, where an individual ignition coil sits directly on top of each spark plug. This layout eliminates the need for separate ignition leads. This setup is confirmed by the Mitsubishi Outlander 2007–2013 Service Manual (Engine Electrical, Ignition System), the Mitsubishi ASA/EPC parts catalogue for CW/ZW series (which lists individual ignition coils but no HT lead set), and aftermarket catalogues such as NGK AU/NZ and Bosch eCat, which list plugs and coils for this model but no conventional lead sets.

Why no leads? COP systems improve reliability and spark energy by minimising voltage losses that occur in long HT leads. They also tidy up packaging under the bonnet and reduce electromagnetic interference, which helps emissions and engine management. Instead of leads, the Outlander’s coils use short insulating boots that connect straight to the plugs inside the plug tubes.

What should owners service instead? Focus on spark plugs and the coil-on-plug units:

• Spark plugs: Use the correct heat range and gap as specified in the service manual. Iridium plugs typically run long intervals (often around 90,000–100,000 km), but heavy towing, frequent short trips, or rough idle/misfire may warrant earlier inspection.
• Coil boots and seals: Check for hardening, cracking, carbon tracking, or oil/water in the plug wells. Replace boots or coils showing damage or arcing marks. A light smear of dielectric grease on the inside of the boot can help sealing and future removal.
• Coils: There’s no routine replacement interval. Replace only if diagnostics indicate a fault—common signs include misfire under load, rough idle, poor economy, or DTCs like P0301–P0306. A swap test (moving a suspected coil to another cylinder) can help confirm the culprit.

Helpful tips: Keep the plug tubes clean and dry when washing the engine bay, use a torque wrench on plugs to the workshop spec, and if there’s oil in the plug wells, fix the cam cover seals before fitting new plugs or coils.

Technical sources referenced: Mitsubishi Outlander 2007–2013 Service Manual (Ignition System section), Mitsubishi ASA/EPC (CW/ZW series), NGK AU/NZ catalogue, Bosch eCat—each shows a COP ignition layout with no separate ignition lead set for the 2008 Outlander’s engines.

Popular questions

Does a 2008 Mitsubishi Outlander have ignition leads?
No. It uses coil-on-plug ignition across its common engines (4B11, 4B12, 6B31). Service information and parts catalogues list individual ignition coils and spark plugs, not a lead set.

What should be replaced instead of ignition leads on a 2008 Outlander?
Prioritise spark plugs at the recommended interval and inspect the coil boots and plug tubes for cracking, contamination, or tracking. Coils are replaced only when diagnostic checks confirm a fault.

How do you diagnose a misfire without ignition leads?
Scan for fault codes (e.g., P030x), inspect plugs and plug wells, and perform a coil swap test between cylinders. If the misfire follows the coil, the coil is likely the issue, if not, look to plugs, fuel delivery, compression, or intake leaks.