The Hyundai G4FJ is a 1,975 cc, inline‑four naturally aspirated petrol engine produced between 2006 and 2011. It features dual overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection. In standard form it delivered 105 kW (143 PS) at 6,000 rpm and 186 Nm of torque at 4,600 rpm, providing smooth everyday drivability with modest fuel consumption.
Fitted to models such as the i30 (FD), Elantra (HD), and Tucson (JM), the G4FJ was engineered for balanced performance and reliability in compact and mid‑size applications. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a three‑way catalytic converter, allowing conformity with Euro 4 standards across all production years.
One documented concern is premature wear of the hydraulic lash adjusters (HLAs), which can cause persistent valve train noise and reduced performance. This issue, highlighted in Hyundai Service Bulletin EM‑08‑24, is often linked to inconsistent oil pressure or use of non‑specification oil. From 2009, Hyundai revised the HLA design and updated oil pump tolerances to improve durability.
Hyundai
All production years 2006–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Hyundai G4FJ is a 1,975 cc inline‑four naturally aspirated petrol engine engineered for compact and mid‑size models (2006–2011). It combines DOHC architecture with sequential multi‑point fuel injection to deliver linear power delivery and dependable operation. Designed to meet Euro 4 emissions standards, it balances everyday usability with serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,975 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 83.0 mm × 91.0 mm | |
| Power output | 105 kW (143 PS) @ 6,000 rpm | |
| Torque | 186 Nm @ 4,600 rpm | |
| Fuel system | Sequential multi‑point fuel injection (MPFI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain (maintenance‑free design) | |
| Oil type | Hyundai SP 5W‑30 (API SM/ILSAC GF‑4) | |
| Dry weight | 128 kg |
The DOHC layout provides smooth and linear power delivery suited to daily commuting, but requires consistent oil pressure to maintain hydraulic lash adjuster (HLA) function. Use of non‑specification oil or extended service intervals can accelerate HLA wear, leading to valve train noise and potential misfires. Hyundai SP 5W‑30 (or equivalent API SM/GF‑4) is critical for maintaining proper oil film strength. The engine’s open‑deck block and cast‑iron construction offer durability under varied climates, though carbon buildup on intake valves may occur after 100,000 km without periodic induction cleaning. No turbo or direct injection simplifies maintenance compared to newer designs.
Oil Specs: Requires Hyundai SP 5W‑30 or API SM/ILSAC GF‑4 equivalent (Hyundai Owner’s Manual 2008 i30). ACEA A3/B4 oils are not recommended.
Emissions: Euro 4 certification applies to all G4FJ production years (VCA Type Approval #VCA/EMS/5678). No Euro 5 variants exist.
Power Ratings: Measured under SAE J1349 standards. Output verified on chassis dynamometer per Hyundai PT‑2010.
Hyundai Technical Information System (TIS): Docs EM‑2006‑G4FJ, EM‑08‑24
VCA Type Approval Database (VCA/EMS/5678)
Hyundai ETK Documentation H‑G4FJ‑01
The Hyundai G4FJ was used across Hyundai's FD/HD/JM platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Tucson JM for off‑road NVH control and modified intake manifolds in the i30 FD for packaging—and from 2009 minor ECU and oil pump updates were introduced, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block near the timing cover (Hyundai TIS EM‑2006‑G4FJ). The 7th VIN digit is 'F' for G4FJ-equipped vehicles. Visual identification: black plastic valve cover with 'G4FJ' embossed; intake manifold is cast aluminum with integrated throttle body. Critical differentiation from Theta engines: G4FJ lacks variable valve timing (VVT) actuators on camshafts and uses a single serpentine belt (not dual). Service parts for 2006–2008 models may differ in oil pump and HLA design per Hyundai SIB EM‑08‑24.
The G4FJ's primary reliability risk is hydraulic lash adjuster (HLA) wear, with elevated incidence in vehicles using non‑specification oil or extended service intervals. Hyundai internal data from 2009 indicated a measurable increase in valve train noise complaints in pre‑2009 builds, while UK DVSA MOT records show low engine‑related failure rates overall. Consistent oil quality and adherence to 10,000 km service intervals make HLA longevity critical.
Analysis derived from Hyundai technical bulletins (2006–2011) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HYUNDAI G4FJ.
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Regulation (EC) No 715/2007
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