TOYOTA 1NR-FE Engine.

Toyota 1NR-FE Engine .

The Toyota 1NR-FE is a 1.3-litre (1,329 cc) inline-4 petrol engine from Toyota’s NR series, built for efficiency, reliability, and modern emissions standards. It features a DOHC (dual overhead camshaft) layout with 16 valves, dual VVT-i (Variable Valve Timing with intelligence) to optimize valve timing for different driving conditions. The bore and stroke measure 72.5 mm × 80.5 mm, with a compression ratio of about 11.5 : 1 in most versions (some early or lower-spec versions run.

Other features include multi-point fuel injection, a chain-driven camshaft timing mechanism, and relatively lightweight piston design to reduce friction — Toyota also improved the intake path and internal airflow (smoother surfaces, rounded edges) to reduce losses and improve efficiency.

Common Weaknesses & Maintenance Notes

To keep a 1NR-FE engine running well for long, be aware of its known weak points:

Oil consumption / burning: Some engines (especially high mileage) show mild oil burning, often due to worn piston rings or carbon build-up.

EGR valve issues: The EGR (Exhaust Gas Recirculation) valve can get clogged, which causes carbon deposits in the intake or cylinders, resulting in rough idle or reduced performance.

Ignition coil lifespan: Individual ignition coils may fail or degrade over time — watch for misfires or hard starting.

VVT-i mechanism sounds / wear: Some users report knocking or unusual noises from the VVT-i system or its actuators. Regular oil changes with proper grade help protect these components.

The Toyota 1NR-FE is a 1.3-litre inline-4 petrol engine from Toyota’s NR series, engineered for efficiency and modern performance in compact cars like the Toyota Yaris, Corolla, Auris, and Etios. With a displacement of 1,329 cc, a DOHC 16-valve setup, and Dual VVT-i (Variable Valve Timing with intelligence), it delivers a responsive yet economical drive. The bore and stroke measure 72.5 mm × 80.5 mm, paired with a high compression ratio of 11.5:1, producing around 98–101 PS (72–74 kW) and 120–132 Nm of torque, depending on model and market. Built with multi-point fuel injection and a timing chain system, the 1NR-FE is designed for lower maintenance costs and long-term durability. Owners value it for its smooth performance, fuel efficiency, and compliance with strict Euro 4–5 emission standards.

Like many modern compact engines, the 1NR-FE has a few known weak points. Common issues include oil consumption in high-mileage units, carbon build-up in the intake or EGR system, and occasional ignition coil failures, which can cause misfires. With proper maintenance — including regular oil changes with the correct grade, EGR cleaning, timing chain inspections, and fuel system care — this engine is capable of lasting well beyond 200,000 km while maintaining strong efficiency and reliability.