The Ford NX is a 1,388 cc, inline‑four naturally aspirated petrol engine produced between 2005 and 2012. It features a dual overhead camshaft (DOHC) layout with 16 valves and variable cam timing (iVCT), delivering outputs between 60–74 kW (82–100 PS) and torque from 124–128 Nm. Its compact design and lightweight cast‑iron block made it suitable for Ford’s global B‑segment vehicles.
Fitted to models such as the Fiesta (Mk6), Fusion, and Streetka, the NX was engineered for…
All production years (2005–2012) meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/4321).
The Ford NX is a 1,388 cc inline‑four naturally aspirated petrol engine engineered for compact and subcompact vehicles (2005–2012). It combines iVCT variable cam timing with a durable cast‑iron block to deliver responsive urban driving and efficient fuel consumption. Designed to meet Euro 4 standards, it balances economy with everyday reliability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,388 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 71.9 mm × 86.0 mm | |
Power output | 60–74 kW (82–100 PS) | |
Torque | 124–128 Nm @ 3,500–4,000 rpm | |
Fuel system | Multi‑point port injection (Bosch ME7.8) | |
Emissions standard | Euro 4 | |
Compression ratio | 10.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven DOHC with iVCT | |
Oil type | Ford WSS-M2C913-A (SAE 5W‑30) | |
Dry weight | 98 kg |
The Ford NX was used across Ford's B‑platform vehicles with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised intake manifolds in the Fiesta Mk6 and modified accessory brackets in the Streetka—and from 2009 the updated iVCT solenoid created minor interchange limits. All adaptations are documented in OEM technical bulletins.
The NX's primary reliability risk is iVCT solenoid failure in early builds (2005–2008), with elevated incidence in high-mileage or neglected service histories. Ford internal data from 2010 indicated a notable share of pre-2009 engines requiring solenoid replacement before 100,000 km, while UK DVSA records show increased idle instability linked to cam phaser faults in urban-driven vehicles. Extended oil intervals and low-quality fuel increase solenoid clogging, making oil specification and interval adherence critical.
Analysis derived from Ford technical bulletins (2008–2014) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
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The NX is generally reliable if maintained properly. Early models (2005–2008) are prone to iVCT solenoid issues, but post-2009 revisions resolved this. Regular oil changes with correct 5W-30 spec and timely servicing ensure longevity beyond 180,000 km.
Top issues include iVCT solenoid failure (early engines), timing chain tensioner wear, thermostat housing leaks, and ignition coil fouling. All are documented in Ford service bulletins SSM 39872 and TIS updates.
The NX powered the Fiesta Mk6 (2005–2011), Fusion (2005–2011), and Streetka (2005–2007). All are 1.4L iVCT petrol variants meeting Euro 4 standards throughout production.
Limited potential. The NX responds modestly to ECU remapping (+5–8 kW), but stock internals and cast-iron block limit gains. Cold air intake and exhaust upgrades offer marginal improvements. Aggressive tuning risks reliability due to conservative factory tolerances.
In a Fiesta 1.4 iVCT (80 PS), expect ~7.8 L/100km (city) and ~5.4 L/100km (highway), or ~45 mpg UK combined. Real-world economy depends heavily on driving style, vehicle weight, and maintenance condition.
Yes. The NX is an interference engine. If the timing chain fails (rare but possible), valve-to-piston contact can cause catastrophic damage. However, the chain is robust and typically lasts the engine’s life if oil is maintained.
Ford specifies SAE 5W-30 oil meeting WSS-M2C913-A. Using incorrect oil can impair iVCT operation and accelerate solenoid wear. Change every 15,000 km or annually, whichever comes first.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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