The Kia G4K1 is a 1,591 cc, inline‑four naturally aspirated petrol engine produced from 2018 onwards. 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 Ceed (CD), XCeed, and ProCeed, the G4K1 was engineered for European driving conditions, emphasizing smooth power delivery and low emissions. It prioritizes fuel economy and low-end torque for urban and highway use, paired with a quiet and refined operation. Emissions compliance is achieved through precise fuel injection and variable valve timing, meeting Euro 6d 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‑20‑FL‑004. 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 2018–Present meet Euro 6d standards across all applicable markets (VCA UK Type Approval #VCA/KIA/G4K1).
The Kia G4K1 is a 1,591 cc inline‑four naturally aspirated petrol engine engineered for compact hatches and crossovers (2018-Present). 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 6d standards, it balances everyday performance with stringent emissions compliance.
| 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 @ 4,500 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | API SP/ILSAC GF-6 5W-30 | |
| Dry weight | Not Publicly Available |
The Dual CVVT system provides smooth, linear power delivery ideal for mixed driving conditions 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 SP/ILSAC GF-6 5W-30 specification (Kia Owner's Manual OM-G4K1). ACEA A5/B5 is also acceptable.
Emissions: Euro 6d certification applies to all production years 2018-Present (VCA Type Approval #VCA/KIA/G4K1).
Power Ratings: Measured under SAE J1349 standards. Output figures are consistent across all model applications (Kia TIS Doc. TIS-G4K1-01).
Kia Technical Information System (TIS): Docs TIS-G4K1-01, WM-G4K1
Kia Owner's Manual: OM-G4K1
VCA Type Approval Database (VCA/KIA/G4K1)
The Kia G4K1 was used across Kia's CD platform with transverse mounting. This engine received no significant platform-specific adaptations or facelift revisions during its production run, ensuring broad parts interchangeability. All applications 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 G4K1 engines feature a black plastic intake manifold and a timing chain cover on the front. Critical differentiation from the turbocharged Gamma engines: G4K1 has no turbocharger or associated plumbing. Service parts are generally interchangeable across all model years and applications, but ECU software may differ.
The G4K1's primary reliability risk is carbon buildup on intake valves, with elevated incidence in short-trip urban use. Kia TSB TSB‑20‑FL‑004 documents this as a common service procedure, while owner feedback suggests it can manifest as early as 70,000 km. Frequent short journeys that prevent the engine reaching optimal temperature make periodic intake cleaning critical.
Analysis derived from Kia technical bulletins (2018-Present) and owner-reported data aggregated from UK MOT advisory notices (2020-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA G4K1.
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