Engine Toyota 2NZ-FE

2NZ engine – 4-stroke 4-cylinder gasoline with electronic fuel injection and ignition control system, in-line cylinders and pistons rotating one common crankshaft, with two overhead camshafts (usually with a variable valve timing system VVT-i). The engine has a closed-type forced circulation liquid cooling system. Combined lubrication system: pressure and spray.

The 2NZ-FE engine was redesigned in 2003 due to the introduction of Euro 4 emission standards. The following changes were made to the engine:

• the shape of the piston has been changed;
• changed the shape of the exhaust manifold;
• the design of the three-way catalytic converter has been changed;
• installed three-way catalytic converter;
• the ECU has been changed to 32 bit.

The NZ family also includes engines: 1NZ‑FE and 1NZ‑FXE.

The engine was installed on:

• Toyota bB NCP3 in 2000 – 2005;
• Toyota Echo XP10 in 1999 – 2005;
• Toyota Ist XP60 in 2002 – 2007;
• Toyota Porte AP10 in 2004 – 2012; Porte XP140 since 2012;
• Toyota Yaris XP10 in 1999 – 2005; Yaris XP90 in 2005 – 2011; Yaris XP130 since 2011.

Specifications

Production years	since 1999
Displacement, cc	1298
Fuel system	injector MPI
Power output, hp	80 – 90
Torque output, Nm	120 – 125
Cylinder block	aluminum R4
Block head	aluminum 16v
Cylinder bore, mm	75
Piston stroke, mm	73.5
Compression ratio	10.5
Features	ETCS-i since 2004
Hydraulic lifters	since 2004
Timing drive	chain
Phase regulator	VVT-i intake
Turbocharging	no
Recommended engine oil	5W-30
Engine oil capacity, liter	3.7
Fuel type	petrol
Euro standards	EURO 2/3/4
Fuel consumption, L/100 km (for Toyota Yaris 2008) — city — highway — combined	7.6 4.8 5.7
Engine lifespan, km	~250 000
Weight, kg	88

Disadvantages of the 2NZ-FE engine

1. Increased oil consumption. The problem is noticed after about 150 thousand kilometers. It can be solved either by replacing the rings and caps, or by decarbonizing.
2. Noises in the motor. The main reason is the timing chain stretching. As a rule, it appears after 200 thousand kilometers. It just needs to be replaced. Also check the damper and chain tensioner.
3. The engine speed fluctuates at idle. It is required to clean the throttle-valve module, as well as the detector and valve at idle speed.
4. A whistling sound appeared in the engine. This is a characteristic of a cracked alternator belt. It just needs to be replaced.
5. Vibrations from the unit. It is necessary in sequence: check the front cushion, clean the injectors, replace the fuel filter.

Problems also include: breakdown of the oil pressure sensor, leakage of the rear oil seal on the crankshaft, inability to repair the cylinder block. Most often, upon reaching 200 thousand km of run, the motor changes. The use of quality engine oil will help to increase the durability of the Toyota 2NZ engine.

Cylinder block

The Toyota 2NZ-FE has a five-bearing aluminum cylinder block and thin-walled cast iron liners. It has a bore of 75.0 and a stroke of 73.5 mm. The engine has a crankshaft with four counterweights and an integrated crankshaft position sensor.

The steel connecting rods for the 2NZ-FE engine have caps that are held in place by bolts from the plastic area. The engine is equipped with aluminum alloy pistons, semi-floating piston pins and low voltage rings (two compressor rings and one oil control ring).

Cylinder head

The 2NZ-FE cylinder head is made of aluminum alloy, which ensures good cooling efficiency. The engine has 2 overhead camshafts driven by a roller timing chain with 8.0mm pitch and 4 valves per cylinder (16 in total). The timing chain is lubricated with engine oil from an oil jet. The engine has a pentroof type combustion chamber and cross manifolds.

The 2NZ-FE used variable valve timing with intelligent system (VVT-i) on the intake camshaft. The intake valves are 30.5 mm in diameter and the exhaust valves are 25.5 mm. The engine has an intake duration of 225 degrees and an exhaust duration of 216 degrees. The 2NZ engine used special shims to adjust the valve clearance.