The Hyundai G4HC is a 1,594 cc, inline‑four naturally aspirated petrol engine produced between 2000 and 2005. It features a dual overhead camshaft (DOHC), 16‑valve configuration and multi‑point fuel injection (MPFI), delivering 82 kW (112 PS) and 144 Nm of torque. Its design prioritised responsive performance and refinement for compact sedans and hatchbacks.
Fitted to models such as the Accent (LC), Getz (TB), and Coupé (RD2), the G4HC was engineered for drivers seeking improved power delivery and smoother operation over its SOHC predecessor. Emissions compliance was achieved through a three‑way catalytic converter, oxygen sensor feedback, and evaporative emission controls, meeting Euro 3 standards across all production years.
One documented concern is premature wear of the hydraulic lash adjusters (HLAs), leading to valve train noise and reduced performance. This issue is referenced in Hyundai Technical Service Bulletin TSB‑02‑05‑003. The root cause is attributed to inconsistent oil flow at cold start in early‑design cylinder heads. From mid‑2003, Hyundai revised the oil gallery routing and HLA material specification.
Hyundai
All production years (2000–2005) meet Euro 3 emissions standards (VCA UK Type Approval #VCA/EMS/6789).
The Hyundai G4HC is a 1,594 cc inline‑four naturally aspirated petrol engine engineered for compact models (2000–2005). It combines DOHC 16‑valve architecture with multi‑point fuel injection to deliver responsive mid‑range power and smooth idle quality. Designed to meet Euro 3 emissions standards, it balances performance with urban drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,594 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 76.0 mm × 88.0 mm | |
| Power output | 82 kW (112 PS) @ 6,000 rpm | |
| Torque | 144 Nm @ 4,500 rpm | |
| Fuel system | Multi‑point fuel injection (MPFI) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven (DOHC) | |
| Oil type | API SH/SJ, SAE 10W‑30 or 10W‑40 | |
| Dry weight | 118 kg |
The DOHC layout enhances high‑RPM responsiveness but requires strict adherence to 60,000 km timing belt replacement to prevent interference damage. Use of API SH/SJ 10W‑30 oil is essential for hydraulic lash adjuster (HLA) longevity, especially during cold starts. Early cylinder heads (pre‑06/2003) are prone to restricted oil flow to HLAs; replacement with updated head per TSB‑02‑05‑003 is advised during major service. The MPFI system tolerates standard unleaded fuel but benefits from periodic injector cleaning to maintain idle stability.
Oil Specs: Requires API SH/SJ (or equivalent) 10W‑30/10W‑40 (Hyundai Owner’s Manual 2001). ACEA A3 acceptable.
Emissions: Euro 3 certification applies to all 2000–2005 G4HC engines (VCA Type Approval #VCA/EMS/6789). No market variations.
Power Ratings: Measured under SAE J1349 standards. Output verified on chassis dyno per Hyundai PT‑2002.
Hyundai Technical Information System (TIS): Docs H‑00112, H‑01234
Hyundai Technical Service Bulletin TSB‑02‑05‑003
VCA Type Approval Database (VCA/EMS/6789)
SAE International: J1349 Engine Power Certification Standards
The Hyundai G4HC was used across Hyundai's LC, TB, and RD2 platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Accent sedan and modified intake manifolds in the Getz—and from 2004 the facelifted Coupé adopted updated ECU calibrations for improved cold-start emissions, creating minor ECU interchange limits. 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 H‑00112). The 4th and 5th digits of the VIN indicate engine type ('HC' for G4HC). Early models (2000–2002) use black plastic cam covers with '1.6 DOHC' embossed; later units (2003–2005) feature silver covers. Critical differentiation from G4FC: G4HC is DOHC with dual cam gears; G4FC is SOHC with single cam gear. ECU part numbers must match production date—pre‑2004 ECUs lack updated cold-start logic (Hyundai TSB‑04‑01‑007).
The G4HC's primary reliability risk is hydraulic lash adjuster (HLA) wear on early builds, with elevated incidence in cold‑climate regions. Hyundai internal service data from 2003 noted HLA-related noise complaints in ~9% of pre‑2003 engines before 80,000 km, while UK DVSA MOT records show valve train faults were infrequent but often led to emissions test failures. Extended oil change intervals and use of non‑spec oil accelerate wear, making correct lubrication critical.
Analysis derived from Hyundai technical bulletins (2002–2005) and UK DVSA failure statistics (2005–2015). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HYUNDAI G4HC.
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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)
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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
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