The Hyundai G4JP is a 1,594 cc, inline‑four naturally aspirated petrol engine produced between 2000 and 2005. It features a dual overhead camshaft (DOHC) layout with 16 valves and multi‑point fuel injection. In standard form it delivered 85–88 kW (116–120 PS) and torque figures between 142–144 Nm, offering responsive urban drivability with modest fuel consumption.
Fitted to models such as the Accent LC, Matrix FC, and Getz TB, including the 1.6 GL and 1.6 SX variants, the G4JP was engineered for compact car efficiency and reliability. Emissions compliance was achieved through three‑way catalytic conversion and precise electronic fuel control, allowing conformity with Euro 3 standards across all production years.
One documented concern is premature wear of the exhaust camshaft lobe, which can cause rough running and misfires. This issue, highlighted in Hyundai Service Bulletin HMC‑SB‑03‑021, is often linked to infrequent oil changes or use of non‑specified oil viscosity. From 2003 onward, Hyundai revised camshaft metallurgy and updated valve spring rates to improve durability.
Hyundai
All production years 2000–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/4321).
The Hyundai G4JP is a 1,594 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and sedans (2000–2005). It combines DOHC architecture with multi-point fuel injection to deliver smooth low-to-mid range power and fuel-efficient operation. Designed to meet Euro 3 emissions standards, it balances urban agility with serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,594 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 76.5 mm × 87.0 mm | |
| Power output | 85–88 kW (116–120 PS) @ 6,000 rpm | |
| Torque | 142–144 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 (replace every 90,000 km) | |
| Oil type | Hyundai SP 10W‑30 or 10W‑40 (API SL) | |
| Dry weight | 112 kg |
The DOHC valvetrain delivers smooth power but requires timely timing belt replacement every 90,000 km to prevent catastrophic failure. Exhaust cam lobe wear—particularly in early builds—is accelerated by extended oil change intervals or incorrect viscosity; Hyundai SP 10W-30/40 (API SL) is essential. The engine is interference-design, so belt failure risks piston-valve contact. Post-2003 units feature improved cam hardness per SIB HMC-SB-03-021. Regular valve clearance checks are recommended due to mechanical tappets.
Oil Specs: Requires Hyundai SP 10W-30 or 10W-40 (API SL). Avoid synthetic-only formulations unless specified (Hyundai SIB HMC-SB-03-021).
Emissions: Euro 3 certification applies to all 2000–2005 G4JP engines (VCA Type Approval #VCA/EMS/4321). No Euro 4 variants exist.
Power Ratings: Measured under SAE J1349 standards. Output varies slightly by ECU calibration (Hyundai TIS Doc. G4JP-P105).
Hyundai Technical Information System (TIS): Docs G4JP-A101, G4JP-F201, G4JP-T301, SIB HMC-SB-03-021
VCA Type Approval Database (VCA/EMS/4321)
SAE International: J1349 Engine Power Certification Standards
The Hyundai G4JP was used across Hyundai's LC/FC/TB platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Getz TB and modified intake manifolds in the Matrix FC—and from 2003 the updated camshaft metallurgy improved durability, creating minor ECU and parts interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front left side of the block near the timing cover (Hyundai TIS G4JP-ID01). The 7th VIN digit for G4JP is typically 'J' (e.g., KMHLC21BPGU123456). Early units (2000–2002) use a silver cam cover with part number 21110-23000; post-2003 revisions use reinforced camshaft 21110-23010. The intake manifold on Getz TB includes an integrated resonator absent on Accent LC. ECU part numbers differ by model—ensure compatibility when swapping. No diesel variants share this code.
The G4JP's primary reliability risk is exhaust camshaft lobe wear, with elevated incidence in high-mileage or poorly maintained engines. Hyundai internal data from 2004 indicated a notable share of 2000–2002 engines requiring cam replacement before 100,000 km, while UK DVSA records show few emissions-related failures due to robust catalytic design. Extended oil change intervals and urban driving increase cam wear risk, making oil quality and interval adherence critical.
Analysis derived from Hyundai technical bulletins (2002–2006) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HYUNDAI G4JP.
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
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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.
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