The Hyundai G4CS is a 1,594 cc, inline‑four naturally aspirated petrol engine produced between 2005 and 2010. It features a 16‑valve DOHC layout, sequential multi‑point fuel injection (SFI), and a cast‑iron block with aluminum head. In standard form it delivered 81–85 kW (110–115 PS) and 144–147 Nm of torque, engineered for entry‑level reliability and urban drivability.
Fitted to models such as the Hyundai Getz (TB), Accent (MC), and Lavita (FC), the G4CS was engineered for economical city driving and low maintenance costs. Emissions compliance was achieved through a three‑way catalytic converter and precise fuel metering, meeting Euro 4 standards across all production years.
One documented concern is premature wear of the hydraulic lash adjusters (HLAs), leading to valve train noise and potential camshaft scoring, highlighted in Hyundai Service Bulletin TSB‑06‑G4CS‑01. This issue stems from marginal oil flow under extended service intervals or use of non‑specified viscosity grades. From 2007, Hyundai revised HLA material and updated oil recommendations to mitigate wear.
All production years 2005–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/3456).
The Hyundai G4CS is a 1,594 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and MPVs (2005–2010). It combines sequential multi‑point injection with a durable cast‑iron block to deliver predictable performance and low running costs. Designed to meet Euro 4 emissions standards, it prioritizes simplicity and serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,594 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 76.5 mm × 87.0 mm | |
| Power output | 81–85 kW (110–115 PS) | |
| Torque | 144–147 Nm @ 4,500 rpm | |
| Fuel system | Sequential multi‑point injection (SFI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain (front‑mounted) | |
| Oil type | Hyundai SP II (API SL/CF, SAE 10W‑30 or 10W‑40) | |
| Dry weight | 112 kg |
The naturally aspirated design provides linear throttle response ideal for urban commuting but requires adherence to 10,000 km oil change intervals using API SL/CF 10W‑30 or 10W‑40 oil to maintain hydraulic lash adjuster (HLA) function. Extended intervals or incorrect viscosity can lead to HLA collapse and camshaft wear. The absence of complex emissions hardware (no GPF, no direct injection) simplifies maintenance, though catalytic converter efficiency must be preserved through proper fuel and ignition system upkeep. Post‑2007 units benefit from improved HLA materials per TSB‑06‑G4CS‑01.
Oil Specs: Requires API SL/CF 10W‑30 or 10W‑40 oil (Hyundai TSB‑06‑G4CS‑01). ACEA A3/B3 also acceptable.
Emissions: Euro 4 certification applies to all G4CS models (2005–2010) (VCA Type Approval #VCA/EMS/3456).
Power Ratings: Measured under SAE J1349 standards. Full 85 kW output requires RON 95 petrol (Hyundai TIS Doc. H4CS‑FUEL‑01).
Hyundai Technical Information System (TIS): Docs H4CS‑ENG‑01, H4CS‑ENG‑02, H4CS‑FUEL‑01, TSB‑06‑G4CS‑01
VCA Type Approval Database (VCA/EMS/3456)
SAE International: J1349 Engine Power Certification Standards
The Hyundai G4CS was used across Hyundai's TB, MC, and FC platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Getz TB and updated intake manifolds in the Accent MC—and from 2007 the Lavita FC facelift introduced updated HLA components, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Hyundai TIS H4CS‑ID‑01). The 7th VIN digit indicates engine family ('C' for G4CS series). Early models (2005–2006) use Siemens MS17.9 ECU with rectangular under‑hood diagnostic port; post‑2007 units use updated MS17.9.1 with revised HLA calibration. HLA part numbers differ before/after 01/2007—verify against Hyundai TSB‑06‑G4CS‑01 for correct replacement.
The G4CS's primary reliability risk is hydraulic lash adjuster (HLA) wear on early builds, with elevated incidence under extended oil change intervals or incorrect viscosity. Hyundai internal durability reports from 2007 indicated a measurable share of pre‑2007 engines requiring HLA replacement before 80,000 km, while UK DVSA data shows catalytic converter failures rising in vehicles with chronic misfire or poor maintenance. Urban stop‑start driving and infrequent oil changes amplify HLA and emissions system stress, making oil quality and service adherence critical.
Analysis derived from Hyundai technical bulletins (2005–2010) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HYUNDAI G4CS.
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Regulation (EC) No 715/2007
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