The Jaguar EC is a 2,967 cc, naturally aspirated V6 petrol engine produced between 2006 and 2010. Part of Jaguar's AJ-V6 family, it features double overhead camshafts (DOHC), variable valve timing (VVT), and sequential multi-point fuel injection (SMPFI). In standard tune, it delivers 177 kW (240 PS) and 283 Nm of torque, providing smooth linear power delivery ideal for grand touring applications.
Fitted to models such as the XF (X250 pre-facelift), S-Type (X204), and XJ (X350), the EC engine was engineered for refined cruising and responsive mid-range performance. It complies with Euro 4 emissions standards through precise air-fuel ratio control and integrated catalytic converters, ensuring compatibility with European fuel and emissions regulations.
One documented concern is premature throttle body wear, highlighted in Jaguar Technical Service Bulletin JTSB-15-10-02. This issue arises from carbon buildup and actuator degradation, leading to idle instability and throttle response faults. From 2008, Jaguar introduced revised throttle body assemblies with improved sealing and updated ECU calibration to mitigate failure rates.
Jaguar
Production years 2006–2010 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/6789).
The Jaguar EC is a 2,967 cc V6 petrol engine designed for executive sedans and luxury saloons (2006–2010). It combines DOHC architecture with variable valve timing to deliver smooth power delivery and high-revving capability. Engineered to meet Euro 4 standards, it balances refinement with regulated emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,967 cc | |
| Fuel type | Petrol | |
| Configuration | V6, DOHC, 24-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 89.0 mm × 79.5 mm | |
| Power output | 177 kW (240 PS) @ 6,500 rpm | |
| Torque | 283 Nm @ 4,100 rpm | |
| Fuel system | Sequential multi-point fuel injection (SMPFI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Valvetrain | DOHC with variable valve timing (VVT) | |
| Timing system | Double-row roller chain (front-mounted) | |
| Oil type | Jaguar Specification WSS-M2C913-A (5W-30) | |
| Dry weight | 182 kg |
The EC's naturally aspirated design provides predictable throttle response and high-revving character, but requires consistent use of premium unleaded petrol (RON 95 minimum) to prevent detonation and maintain valve train longevity. Jaguar WSS-M2C913-A (5W-30) oil is essential due to its thermal stability and compatibility with VVT actuators. Throttle body cleaning or replacement per JTSB-15-10-02 is recommended if idle fluctuations occur. The front-mounted timing chain is robust but should be inspected for tensioner wear during major services. Post-2008 models benefit from updated throttle assemblies, reducing carbon-related faults.
Oil Specs: Requires Jaguar WSS-M2C913-A (5W-30) specification (Jaguar SIB JTSB-11-20-03). Supersedes ACEA A3/B4.
Emissions: Euro 4 certification applies to all 2006–2010 models (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under SAE J1349 standards. Output consistent across EU markets (Jaguar TIS Doc. JT-EC-POWER).
Jaguar Technical Information System (TIS): Docs JT-EC-CONF, JT-EC-VVT, JTSB-15-10-02
VCA Type Approval Database (VCA/EMS/6789)
SAE International: J1349 Engine Power Certification Standards
The Jaguar EC was used across Jaguar's X250/X204 platforms with longitudinal mounting and shared design lineage with Land Rover units in the LR2 (L334). This engine received platform-specific adaptations-fuel mapping revisions in the S-Type and enhanced NVH tuning in the XJ-and from 2008, updated throttle body calibration improved reliability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left-side cylinder block near the exhaust manifold (Jaguar TIS JT-EC-ID). The 8th VIN digit indicates engine type ('G' for petrol V6). Pre-2008 models use black valve covers with 'EC' label; post-2008 units feature revised throttle housing with updated serial tag. Critical differentiation from AJ30: EC has integrated VVT control and revised intake manifold routing. Service parts require model-year verification—throttle bodies before 2008 are not interchangeable with later revisions (Jaguar SIB JTSB-15-10-02).
The EC's primary reliability risk is throttle body degradation, with elevated incidence in vehicles with frequent short-trip usage. Internal Jaguar field reports from 2009 indicated a significant share of pre-2008 units required throttle body replacement before 100,000 km, while UK DVSA MOT data shows emissions-related failures are common in poorly maintained examples. Extended oil intervals and low-quality fuel increase VVT and injector stress, making adherence to service schedules and fuel quality critical.
Analysis derived from Jaguar technical bulletins (2006–2010) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
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JAGUAR Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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