Toyota 1AZ-FE/FSE 2.0L Engine Specs, Problems, Reliability. The AZ series pertained to replace the Toyota S Series engines in 2000. The very first in the displacement variety is the 2.0-liter 1AZ-FE engine. Its predecessor is the 3S-FE. The engine includes numerous advanced innovations for that period.
The 1AZ has aluminum cylinder block with cast iron liners. It includes balanced out cylinder and crank. The engine got the created steel crankshaft, completely stabilized by 8 counterweights. The crankshaft is attached to the block by 5 primary bearings. In between 2nd and very first bearings there is a gear driven two balancing shafts in the lower aluminum crankcase. The using of balancing shafts was a big step in the decrease of engine vibration. Helical gears are made from polymeric product for the decrease of noise.
On top of the block, there is aluminum DOHC 16-valve cylinder head. The intake camshaft is equipped with VVT-i system (Toyota variable valve timing system), altering timing by 50 deg. A single-stage roller timing chain drives camshafts. The angle in between intake valves and exhaust valves is 27.5 deg. Intake valve diameter is 34.0 mm (1.3 in), and for exhaust valve – 29.5 mm (1.2 in). Valve lift is 8.0 mm (0.3-in) for both valve types. There are no hydraulic lifters.
The engine geared up with the sequentially injected fuel system. Each fuel injectors has twelve little injection holes (0.18 mm or 0.01 in). The intake manifold is made of plastic. The exhaust manifold and catalytic converter is one unit.
The 1AZ engine has higher efficiency and fuel economy, low noise and vibration levels, light-weight and compact style, and outstanding reliability compared to the predecessor. The engine has the older brother – the 2AZ-FE engine. The latest 3ZR-FE engine supersedes the 1AZ because 2007.
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Toyota 1AZ-FE/FSE 2.0L Engine Problems and Reliability
The common problem for the AZ series engine is cylinder head bolt threads break in cylinder obstructs produced till 2007. Vibration on idle rpm (on 500-600 rpm) is typical for the 1AZ. The JDM engines have EGR system. A stopped up EGR valve causes unsteady engine revs, lost in power, and so on. The 1AZ-FSE engine is susceptible to fuel quality. Bad fuel can cause the high-pressure fuel pump or fuel injector damages.
Toyota does not provide any opportunity to rebuild the cylinder block, however it is quite reliable and long about 200k miles easy.
Toyota 1AZ-FE/FSE 2.0L Engine Modifications
1AZ-FSE. Direct fuel injection engine version includes Toyota’s D-4 direct injection system and a compression ratio of 10.5:1. The engine produces 148 hp (110 kW) at 5700 rpm with 148 lbft (200 Nm) of torque at 4000 rpm.
you must see more engine detail in here: Engine – US Cars News or you can see on wiki here
Toyota 1AZ-FE/FSE 2.0L Engine Specs
| Manufacturer | Kamigo Plant Toyota Motor Manufacturing Alabama |
| Production years | 2000-present day |
| Cylinder block material | Aluminum |
| Cylinder head material | Aluminum |
| Fuel type | Gasoline |
| Fuel system | Fuel injection |
| Configuration | Inline |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Valvetrain layout | DOHC |
| Bore, mm | 86.0 |
| Stroke, mm | 86.0 |
| Displacement, cc | 1998 |
| Type of internal combustion engine | Four-stroke, naturally aspirated |
| Compression Ratio | 9.6:1 10.5:1 (FSE) |
| Power, hp | 145-150 hp (108-112 kW)/6,000 |
| Torque, lb ft | 140-142 lb-ft (190-193 Nm)/4,000 |
| Engine weight | 290 lbs (131 kg) |
| Firing order | 1-3-4-2 |
| Engine oil weight | 0W-20, 5W-20 |
| Engine oil capacity, liter | 4.2 |
| Oil change interval, mile | 6,000 miles (10,000 km) or 12 month |
| Applications | Toyota Camry, Toyota RAV4, Toyota Ipsum, Toyota Avensis, Toyota Caldina, Toyota Gaia, Toyota Isis, Toyota Wish, Toyota Allion, Toyota Opa |