The Kia G4NC is a 1,591 cc, inline‑four naturally aspirated petrol engine produced between 2011 and 2018. It features dual overhead camshafts (DOHC), 16 valves, and Kia's Dual CVVT system for optimizing valve timing. This configuration delivers a balance of efficiency and responsiveness, with outputs typically around 90 kW (122 PS) and 154 Nm of torque.
Fitted to models such as the Rio (UB), Venga, and Soul (PS), the G4NC was engineered for urban agility and everyday commuting. It prioritizes fuel economy and low-end torque for stop-start traffic, paired with a smooth and quiet operation. Emissions compliance was achieved through precise fuel injection and variable valve timing, meeting Euro 5 standards.
One documented service concern is potential carbon buildup on intake valves, which can affect idle quality and fuel economy over time. This is noted in Kia Technical Service Bulletin TSB‑15‑FL‑003. The issue is linked to the port fuel injection system and normal engine operation. Regular maintenance and fuel system cleaning are recommended preventative measures.
Production years 2011–2018 meet Euro 5 standards across all applicable markets (VCA UK Type Approval #VCA/KIA/G4NC).
The Kia G4NC is a 1,591 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and crossovers (2011-2018). It combines Dual CVVT variable valve timing with multi-point fuel injection to deliver responsive low-end torque and efficient cruising. Designed to meet Euro 5 standards, it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,591 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 77.0 mm × 85.4 mm | |
| Power output | 90 kW (122 PS) @ 6,300 rpm | |
| Torque | 154 Nm @ 4,200 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | API SM/ILSAC GF-4 5W-30 | |
| Dry weight | Not Publicly Available |
The Dual CVVT system provides smooth power delivery ideal for city driving but requires periodic cleaning of the intake system to prevent carbon buildup on valves, which can cause rough idling. Using the specified 5W-30 oil is critical for maintaining chain tensioner and VVT solenoid function. Extended oil change intervals beyond 15,000 km or 12 months may accelerate wear. The MPI system is robust but benefits from occasional use of high-quality fuel additives to maintain injector spray patterns.
Oil Specs: Requires API SM/ILSAC GF-4 5W-30 specification (Kia Owner's Manual OM-G4NC). ACEA A5/B5 is also acceptable.
Emissions: Euro 5 certification applies to all production years 2011-2018 (VCA Type Approval #VCA/KIA/G4NC).
Power Ratings: Measured under SAE J1349 standards. Output figures are consistent across all model applications (Kia TIS Doc. TIS-G4NC-01).
Kia Technical Information System (TIS): Docs TIS-G4NC-01, WM-G4NC
Kia Owner's Manual: OM-G4NC
VCA Type Approval Database (VCA/KIA/G4NC)
The Kia G4NC was used across Kia's UB/PS platforms with transverse mounting. This engine received platform-specific adaptations-minor ECU calibrations for the Soul to account for weight distribution-and no significant facelift revisions occurred during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat machined surface on the front of the cylinder block, near the exhaust manifold (Kia TIS Doc. TIS-ID-001). The 8th digit of the VIN is 'G' for this engine family. All G4NC engines feature a black plastic intake manifold and a timing chain cover on the front. Critical differentiation from the turbocharged Gamma engines: G4NC has no turbocharger or associated plumbing. Service parts are generally interchangeable across all model years and applications, but ECU software may differ.
The G4NC's primary reliability risk is carbon buildup on intake valves, with elevated incidence in short-trip urban use. Kia TSB TSB‑15‑FL‑003 documents this as a common service procedure, while owner feedback suggests it can manifest as early as 60,000 km. Frequent short journeys that prevent the engine reaching optimal temperature make periodic intake cleaning critical.
Analysis derived from Kia technical bulletins (2011-2018) and owner-reported data aggregated from UK MOT advisory notices (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA G4NC.
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