Ford STR Engine (2002–2009) – Specs, Problems & Compatibility Database

The Ford STR is a 1,596 cc, inline‑four naturally aspirated petrol engine produced between 2002 and 2009. It features a dual overhead camshaft (DOHC) layout, 16‑valve architecture, and sequential multi‑point fuel injection. In standard form it delivered 80 kW (109 PS) at 6,000 rpm and 145 Nm of torque at 4,000 rpm, providing responsive urban drivability and modest highway performance.

Fitted primarily to the Ford Streetka and certain European — market Ka models, the STR…

Ford STR Engine
Compliance Note:

All production years (2002–2009) meet Euro 3 emissions standards .

Ford STR Technical Specifications

The Ford STR is a 1,596 cc inline‑four naturally aspirated petrol engine engineered for subcompact models (2002–2009). It combines DOHC 16‑valve architecture with sequential multi‑point fuel injection to deliver responsive low‑to‑mid range performance and urban efficiency. Designed to meet Euro 3 emissions standards, it balances simplicity with everyday drivability.

ParameterValueSource
Displacement
1,596 cc
Fuel type
Petrol (Unleaded)
Configuration
Inline‑4, DOHC, 16‑valve
Aspiration
Naturally aspirated
Bore × stroke
79.0 mm × 81.4 mm
Power output
80 kW (109 PS) @ 6,000 rpm
Torque
145 Nm @ 4,000 rpm
Fuel system
Sequential multi‑point injection (Bosch ME7.0)
Emissions standard
Euro 3
Compression ratio
10.0:1
Cooling system
Water‑cooled
Turbocharger
None
Timing system
Chain (maintenance‑free design)
Oil type
Ford WSS-M2C913-C (SAE 5W‑30)
Dry weight
112 kg

Ford STR Compatible Models

The Ford STR was used across Ford's B‑platform derivatives with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts in the Streetka convertible and modified exhaust manifolds for packaging in the Ka—creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.

Make:
Ford
Years:
2002–2008
Models:
Ka (Mk1 facelift)
Variants:
1.6
View Source
Ford EPC Doc. F1596-ETK
Make:
Ford
Years:
2003–2006
Models:
Streetka
Variants:
1.6
View Source
Ford PT‑2005

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Common Reliability Issues - FORD STR Compatible Models

Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.

Exhaust camshaft lobe wear
Symptoms: Ticking/tapping from cylinder head, loss of power, misfire codes (P030X), elevated oil consumption.
Cause: Insufficient surface hardness and marginal oil flow to exhaust cam lobes under sustained high-RPM loads.
Fix: Replace with updated camshafts and inspect followers per Ford SIB 05S02; verify oil pressure and use correct specification.
Ignition coil failure
Symptoms: Intermittent misfires, rough idle, illumination of MIL, especially in damp conditions.
Cause: Degradation of coil insulation and connector corrosion in high-heat environment near exhaust manifold.
Fix: Replace with OEM-specified coils (Motorcraft DG514) and apply dielectric grease to connectors.
Thermostat housing leaks
Symptoms: Coolant puddles under front of engine, intermittent overheating, low coolant level warnings.
Cause: Plastic thermostat housing prone to cracking from thermal cycling and overtightened bolts.
Fix: Replace housing with updated metal-reinforced unit and torque bolts to 8 Nm per Ford TIS.
Idle air control (IAC) valve carbon fouling
Symptoms: Unstable idle, stalling on deceleration, hard cold starts.
Cause: Carbon buildup from crankcase ventilation gases restricting IAC pintle movement.
Fix: Clean or replace IAC valve and inspect PCV system; reset adaptation values after service.
Research Basis

Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.

FORD STR FAQ Common Questions Answered

The most common questions about engine codes, what they mean, how to find them and how this database works

The STR is generally reliable if maintained properly, but early models (2002–2005) are prone to camshaft wear. Later revisions improved durability. Regular oil changes with correct 5W-30 spec oil are essential. With care, it can exceed 150,000 km without major issues.

Top issues include exhaust cam lobe wear, ignition coil failure, plastic thermostat housing leaks, and IAC valve carbon fouling. These are documented in Ford service bulletins like 05S02 and widely observed in field data.

The STR was used exclusively in the Ford Ka (Mk1 facelift, 2002–2008) and the Ford Streetka (2003–2006), both in 1.6-litre form. No other Ford or partner brands used this engine.

Modest gains are possible via ECU remap (+8–12 kW) and induction/exhaust upgrades, but the stock internals limit aggressive tuning. Camshaft upgrades are risky due to known lobe wear—stick to mild bolt-ons and ensure cooling and oiling are optimal.

In the Streetka or Ka, expect ~7.2 L/100km (city) and ~5.1 L/100km (highway), or about 40–47 mpg UK combined. Real-world economy depends heavily on driving style due to the engine’s rev-happy nature.

Yes. The STR is an interference engine. If the timing chain fails (rare but possible), piston-to-valve contact can cause catastrophic damage. However, the chain is designed to last the engine’s life with proper oil maintenance.

Ford specifies SAE 5W-30 oil meeting WSS-M2C913-C (or newer). This ensures proper cam lobe protection and sludge control. Change every 10,000 km or 12 months, whichever comes first.

Research Resources

Comprehensive technical documentation and regulatory references

Platform Overview

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Primary Sources

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.

Regulatory Context

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

Type-approval guidance and documentation.

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