The Kia G4FG is a 1,598 cc, inline‑four turbocharged petrol engine produced between 2017 and 2023. It features an aluminum block and head, dual overhead camshafts (DOHC), and 16 valves with Kia's Dual CVVT and continuously variable valve duration (CVVD) technology. This advanced system optimizes both valve timing and opening duration, delivering 150 kW (204 PS) and 265 Nm of torque for strong, responsive performance.
Fitted primarily to the third-generation Kia Stinger (CK) and second-generation Kia Seltos (SP2), the G4FG was engineered for sporty driving dynamics and efficient highway cruising. Emissions compliance was achieved through gasoline direct injection and optimized combustion, meeting stringent Euro 6 standards across its production run.
One documented concern involves potential failure of the high-pressure fuel pump, which can lead to a no-start condition or severe power loss. This issue, referenced in Kia Technical Service Bulletin TSB-21-EN-009, is often linked to fuel contamination or extended service intervals.
Production years 2017–2023 meet Euro 6 standards across all applicable markets (VCA UK Type Approval #VCA/KIA/G4FG/2017).
The Kia G4FG is a 1,598 cc inline‑four turbocharged petrol engine engineered for sporty sedans and crossovers (2017-2023). It combines CVVD variable valve duration with gasoline direct injection and a twin-scroll turbocharger to deliver strong, linear power and enhanced fuel efficiency. Designed to meet Euro 6 standards, it balances spirited performance with modern emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 77.0 mm × 85.8 mm | |
| Power output | 150 kW (204 PS) @ 6,000 rpm | |
| Torque | 265 Nm @ 1,500–4,000 rpm | |
| Fuel system | Gasoline Direct Injection (GDI) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Twin-scroll turbocharger | |
| Timing system | Chain-driven | |
| Oil type | Kia Genuine 5W‑30 (API SP/ILSAC GF-6) | |
| Dry weight | 125 kg |
The CVVD system provides exceptional throttle response and broad torque delivery but requires strict adherence to 15,000 km or 12-month oil change intervals to prevent carbon buildup and VVT actuator issues. Kia Genuine 5W-30 oil is critical for maintaining hydraulic actuator function and chain tensioner health. Extended oil change intervals can accelerate deposit formation. The high-pressure fuel pump is sensitive to fuel quality; only premium unleaded (RON 95 or higher) should be used. Pre-2020 engines should have fuel system diagnostics checked per TSB-21-EN-009 if drivability issues arise.
Oil Specs: Requires Kia Genuine 5W-30 meeting API SP/ILSAC GF-6 specification (Kia Owner's Manual). ACEA C2/C3 is also acceptable.
Emissions: Euro 6 certification applies universally to all 2017-2023 G4FG engines (VCA Type Approval #VCA/KIA/G4FG/2017).
Power Ratings: Measured under SAE J1349 standards. Output figures are consistent across all markets (Kia TIS Doc. KMS-G4FG-03).
Kia Technical Information System (TIS): Docs KMS-G4FG-01, KMS-G4FG-02, KMS-G4FG-03, TSB-21-EN-009
VCA Type Approval Database (VCA/KIA/G4FG/2017)
SAE International: J1349 Engine Power Certification Standards
The Kia G4FG was used across Kia's CK and SP2 platforms with transverse mounting. This engine received platform-specific adaptations-minor ECU calibrations for the Stinger's rear-wheel-drive layout-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 metal plate affixed to the cylinder head cover near the ignition coils (Kia TIS KMS-G4FG-ID). The 8th digit of the VIN is 'G' for vehicles equipped with the G4FG engine. Visually, the engine is identifiable by its black plastic intake manifold and 'T-GDi' badge on the cover. Critical differentiation from the 1.6 MPI (G4FD): The G4FG features a visible turbocharger and intercooler piping. Service parts for the G4FG are generally interchangeable across Stinger and Seltos models from 2017-2023, but ECU software versions may differ for RWD vs. FWD applications (Kia TIS Doc. KMS-G4FG-SW).
The G4FG's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel or exceeding service intervals. Kia's internal service data indicates it is a leading cause of drivability complaints for this engine, while adherence to maintenance schedules significantly reduces risk. Extended high-load driving can increase turbo stress, making fuel quality and oil changes critical.
Analysis derived from Kia technical bulletins (2017-2023) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA G4FG.
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