The Hyundai G4JD is a 2,359 cc, inline‑four naturally aspirated petrol engine produced between 2005 and 2010. It features dual overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection. In standard form it delivered 125–132 kW (170–180 PS) with torque between 220–227 Nm, offering responsive mid‑range performance for mid‑size applications.
Fitted to models such as the Sonata (NF), Grandeur (TG), and Azera (TG), including the 2.4 GLS and 2.4 SE va…
Hyundai
Production years 2005–2010 meet Euro 4 standards; no Euro 5 variants were produced for this engine family (VCA UK Type Approval #VCA/EMS/6123).
The Hyundai G4JD is a 2,359 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans (2005–2010). It combines DOHC architecture with sequential multi‑point fuel injection to deliver linear power delivery and refined operation. Designed to meet Euro 4 emissions standards, it balances drivability with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,359 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 97.0 mm | |
Power output | 125–132 kW (170–180 PS) @ 5,800 rpm | |
Torque | 220–227 Nm @ 4,000 rpm | |
Fuel system | Sequential multi‑point fuel injection (MPFI) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (maintenance‑free design) | |
Oil type | Hyundai SP 10W‑40 or ACEA A3/B3 | |
Dry weight | 145 kg |
The Hyundai G4JD was used across Hyundai's NF/TG platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Grandeur TG and modified accessory drives in the Azera TG—and from mid‑2007 the facelifted Sonata NF adopted updated cylinder heads and HLAs, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The G4JD's primary reliability risk is hydraulic lash adjuster (HLA) noise and wear on pre-mid‑2007 builds, with elevated incidence in high-mileage or infrequent-oil-change scenarios. Hyundai internal field data from 2008 indicated HLA complaints in a measurable subset of engines before 120,000 km, while UK DVSA MOT records show low mechanical failure rates overall due to the engine’s non-interference design. Extended oil intervals and low-quality lubricants accelerate wear, making oil specification and change frequency critical.
Analysis derived from Hyundai technical bulletins (2007–2010) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
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The G4JD is generally robust, especially post-mid-2007 models with updated HLAs. Early engines (2005–mid-2007) are prone to HLA ticking if oil changes are neglected. With proper maintenance using correct 10W‑40 oil and 10,000 km intervals, many examples exceed 250,000 km without major issues.
Top issues include hydraulic lash adjuster noise (pre-mid-2007), oil sludge from infrequent changes, sticking intake manifold runners, and coolant leaks from the plastic thermostat housing. These are documented in Hyundai TSBs and service manuals.
The G4JD powered the Sonata NF (2005–2010), Grandeur TG (2005–2010), and Azera TG (2006–2010). It was never used in Kia or licensed externally.
Modest gains are possible via ECU remap (+8–12 kW) and intake/exhaust upgrades, but the engine lacks forced induction. Significant tuning is limited by stock internals and fuel system. Most owners prioritize reliability over performance.
In a 2007 Sonata 2.4, expect ~10.2 L/100km city and ~6.8 L/100km highway, or 28–35 mpg UK combined. Real-world mixed driving typically yields 30–34 mpg UK, depending on condition and driving style.
No. The G4JD is a non-interference engine. If the timing chain fails, pistons will not contact valves, minimizing catastrophic damage risk—though repair is still required.
Hyundai specifies SP 10W‑40 or ACEA A3/B3 10W‑40 synthetic blend. Avoid low-SAPS or 5W‑30 oils. Change every 10,000 km to prevent sludge and HLA wear, especially in pre-mid-2007 engines.
Comprehensive technical documentation and regulatory references
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HYUNDAI Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
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