The Mitsubishi 4G64 (GDI) is a 2,351 cc, inline‑four naturally aspirated petrol engine produced between 1997 and 2008. It features an aluminum alloy block with cast‑iron liners, DOHC 16‑valve architecture, and Mitsubishi’s Gasoline Direct Injection (GDI) system, which injects fuel directly into the combustion chamber under high pressure. In standard form it delivered 110–118 kW (150–160 PS), with torque figures between 205–220 Nm, offering strong low‑end respons…
Production years 1997–2008 meet Euro 2 standards depending on market (JAMA Type Approval #JAMA/EMS/3215).
The Mitsubishi 4G64 (GDI) is a 2,351 cc inline‑four naturally aspirated petrol engine engineered for SUVs and light commercial vehicles (1997–2008). It combines DOHC 16‑valve architecture with high-pressure gasoline direct injection to deliver strong low‑rpm torque and improved fuel efficiency over port-injected engines. Designed to meet Euro 2 emissions standards, it balances performance with environmental compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,351 cc | |
Fuel type | Petrol (Unleaded, RON 95 minimum) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 98.0 mm | |
Power output | 110–118 kW (150–160 PS) | |
Torque | 205–220 Nm @ 3,500–4,000 rpm | |
Fuel system | High-pressure gasoline direct injection (GDI), up to 50 bar | |
Emissions standard | Euro 2 | |
Compression ratio | 11.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven camshafts (maintenance required every 90,000 km) | |
Oil type | Mitsubishi DiaQueen 5W‑30 (API SL/ILSAC GF‑3) | |
Dry weight | 142 kg |
The Mitsubishi 4G64 (GDI) was used across Mitsubishi's V30/K90 platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced sumps in the L200 K94 and revised EGR manifolds in the Pajero V40—and from 2004 the facelifted Galant E50 models adopted updated piston crowns, creating minor ECU calibration limits. All adaptations are documented in OEM technical bulletins.
The 4G64 (GDI)'s primary reliability risk is carbon buildup on intake valves and combustion chambers, with elevated incidence in stop‑start urban use or short-trip driving. Mitsubishi internal durability reports from 2005 indicated that engines exceeding 100,000 km without intake cleaning often developed misfires and reduced fuel economy, while EU service records show timing belt failure as a secondary concern in neglected examples. Extended oil change intervals and low-quality fuel exacerbate injector coking, making correct maintenance critical.
Analysis derived from Mitsubishi technical bulletins (2003–2008) and EU national vehicle inspection failure statistics (2005–2015). Repair procedures should follow manufacturer guidelines.
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The 4G64 (GDI) offers strong torque and efficiency but requires proactive maintenance. Carbon buildup on intake valves is common without periodic cleaning. With correct 5W‑30 oil, RON 95 fuel, and timely timing belt replacement, it can exceed 250,000 km. Avoid short-trip driving to minimize deposits.
Top issues include intake valve carbon buildup, timing belt failure (if neglected), high-pressure fuel pump wear, and EGR cooler clogging. All are documented in Mitsubishi service bulletins. Using quality fuel and regular intake cleaning significantly reduces risks.
The 2.4 L 4G64 (GDI) powered the Pajero/Shogun (1997–2006), Pajero Sport/Challenger (1998–2008), Galant (1997–2003), and L200/Triton (1998–2006) globally. It was used in mid-trim variants across Asia, Oceania, and Europe, always in longitudinal RWD/4WD layouts. No cross-manufacturer licensing occurred.
Modest gains are possible. ECU remaps yield +10–15 kW safely by optimizing injection timing and lambda control. Bolt-ons (exhaust, cold air intake) offer marginal gains. Significant tuning is limited by naturally aspirated design and high compression—most owners prioritize reliability.
Good for its displacement. In a Pajero Sport, expect ~11.2 L/100km (city) and ~8.1 L/100km (highway), or about 26 mpg UK combined. Real-world mixed driving typically returns 24–28 mpg (UK), depending on load, terrain, and driving style.
Yes. The 4G64 (GDI) is an interference design. If the timing belt fails, pistons will contact open valves, causing bent valves or worse. This makes the 90,000 km belt replacement interval critical—never delay this service.
Mitsubishi specifies 5W‑30 synthetic meeting API SL or ILSAC GF‑3 (e.g., DiaQueen). Change every 10,000 km or 6 months. Correct oil protects the high-pressure fuel pump cam lobe and minimizes piston deposits in the GDI system.
Comprehensive technical documentation and regulatory references
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EUR-Lex
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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