The Kia G4FJ is a 1,591 cc, inline‑four naturally aspirated petrol engine produced between 2005 and 2011. It features dual overhead camshafts (DOHC), 16 valves, and Kia's CVVT system for variable intake valve timing. This refined design offered improved efficiency over its predecessors, delivering outputs of 110 PS (81 kW) and 144 Nm for responsive urban driving.
Fitted primarily to the second-generation Kia Rio (JB) and the first-generation Kia cee'd, the G4FJ was engineered for balanced performance and fuel economy. It provided smooth power delivery suitable for daily commuting and highway cruising. Emissions compliance was achieved through precise electronic fuel injection and catalytic conversion, meeting Euro 4 standards across its production run.
One documented service concern is premature failure of the variable valve timing (CVVT) oil control solenoid, potentially leading to rough idle or reduced power. This issue, referenced in Kia Technical Service Bulletin TSB-08-FL-005, is often attributed to oil sludge buildup restricting solenoid operation. Kia addressed this in later production by revising the solenoid filter design and reinforcing oil change interval recommendations.
All production years 2005–2011 meet Euro 4 emissions standards (VCA UK Type Approval #VCA/KIA/G4FJ/01).
The Kia G4FJ is a 1,591 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and crossovers (2005-2011). It combines DOHC 16-valve architecture with CVVT variable valve timing to deliver smooth, responsive power and improved fuel efficiency. Designed to meet Euro 4 standards, it balances everyday drivability with lower emissions.
| 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 | 110 PS (81 kW) @ 6,000 rpm | |
| Torque | 144 Nm @ 4,500 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | API SM/ILSAC GF-4, SAE 5W‑30 | |
| Dry weight | 105 kg |
The CVVT system provides smooth, linear power delivery ideal for city driving but requires strict adherence to 10,000 km or 12-month oil change intervals to prevent solenoid clogging. Using the specified 5W-30 oil is critical due to its role in lubricating the hydraulic CVVT actuator. Extended idling or frequent short trips can accelerate sludge formation. The timing chain is designed for the engine's life, but tensioner wear, as noted in general service bulletins, necessitates inspection if noise occurs. Fuel injectors should be cleaned every 60,000 km to maintain optimal spray patterns.
Oil Specs: Requires API SM/ILSAC GF-4, SAE 5W-30 specification (Kia Owner's Manual). ACEA A5/B5 is also acceptable.
Emissions: Euro 4 certification applies to all models and years (VCA Type Approval #VCA/KIA/G4FJ/01). No market-specific variations.
Power Ratings: Measured under SAE J1349 standards. Output is consistent across all applications (Kia TIS Doc. KTIS-G4FJ-01).
Kia Technical Information System (TIS): Docs KTIS-G4FJ-01, TSB-08-FL-005
VCA Type Approval Database (VCA/KIA/G4FJ/01)
SAE International: J1349 Engine Power Certification Standards
The Kia G4FJ was used across Kia's JB and ED platforms with transverse mounting. This engine received platform-specific adaptations-optimized engine mounts for the cee'd-and no significant facelift revisions affecting core compatibility. 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 gearbox flange (Kia TIS KTIS-G4FJ-01). The 8th digit of the VIN for Rio JB models is 'F' for the 1.6L petrol variant. Visually, the engine features a black plastic intake manifold and a prominent "CVVT" badge on the front cover. Differentiation from the G4FC: The G4FJ uses a timing chain (visible under the front cover), while the earlier G4FC uses a timing belt. Service parts, particularly for the timing system and CVVT, are not interchangeable between G4FJ and other 1.6L Kia engines (Kia SPC Manual).
The G4FJ's primary reliability risk is CVVT oil control solenoid failure, with elevated incidence in vehicles subjected to extended oil change intervals. Kia TSB-08-FL-005 documents this issue, while owner feedback frequently cites it as a concern after 80,000 km. Neglecting oil service or using incorrect viscosity makes solenoid clogging and subsequent performance issues critical.
Analysis derived from Kia technical bulletins (2008-2011) and owner-reported failure data (2010-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA G4FJ.
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Regulation (EC) No 715/2007
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