1AZ-FE/FSE 2.0

The Japanese largest corporation Toyota released a new brand of AZ automobile engines at the beginning of this century; they replaced the S series of engines. The 3S-FE engine, with a high rating for use in the middle class, replaced the 1AZ-FE.

AZ series engine. Image taken from https://www.toyota-club.net

By the time 1AZ-FE was installed on the Camry V50, all the problems and shortcomings had been corrected, so this is the most reliable Camry XV50 engine.

Specifications

Hydraulic chain tensioner 1AZ.
Image by toyota-club.net The 1AZ engine was released by Toyota in 2000. Weight – 131 kg. Engine type - in-line, 4-cylinder, volume - 1998 cc. The engine has 16 valves. The maximum output power of the unit is 147 -152 horsepower, nominal - 145 - 150 horsepower. At the maximum output power, 5.7 - 6 thousand rpm occurs. Torque – 190,200 N*m is created at 4 thousand rpm.

Features of AZ-FE - sequential multipoint injection, VVT-I gas distribution system, chain drive.

The cylinder block is made of aluminum, thin-walled cast iron liners with a diameter of 86 mm, piston stroke - 86 mm, compression ratio - 9.8 - 11. The cylinder axis is offset relative to the crankshaft, which increased the service life of the liners.

The fuel used is AI-95 gasoline, its consumption per hundred kilometers in the city will be 11.4 liters, on the highway - 7.3 liters, with mixed driving - 9.8 liters.

To keep your engine running, be sure to keep an eye on your oil. The oil volume in the engine is 4.2 liters, oil type - 0W-20, 5W20. Oil consumption per thousand kilometers is allowed by the manufacturer to be no more than one thousand grams.

Since January 1, 2016, the Euro-5 environmental standard has been in force in the Russian Federation for all cars. For emissions, the established norm is: CO up to 0.8 g/km, CH up to 0.05 g/km, NOy up to 0.06 g/km.

Gasoline consumption

We will give you the factory data on the consumption of the 1AZ engine on different Toyota cars.

The Camry V50 was equipped with 1AZ-FE paired with a 4-speed automatic transmission. Gasoline consumption by the engine in this version is 11.4 liters in the city, 6.5 on the highway and 8.3 in mixed mode.

1AZ block head design.

On the Toyota Avensis in the Russian market, 1AZ-FSE was installed, and was coupled with a 5-speed manual transmission and a 4-speed automatic transmission. The difference in average consumption between the two options is stated to be significant, more than one liter per 100 km: 9.2 liters per 100 km with an automatic transmission and 8.1 with a manual transmission.

In Europe, 1AZ-FE was installed on the Avensis Verso and was equipped with a 5-speed manual transmission and 4 automatic transmission. Fuel consumption with manual transmission was 11.5 in the city, 6.8 outside the city and 8.6 in the combined cycle. With an automatic, the engine consumed half a liter more.

Fuel consumption of any engine, and 1AZ-FE/FSE is no exception, depends on many factors: driving style, vehicle weight, gearbox, time of year, tires.

Malfunctions and repairs

The following problems are typical for engines:

The weak point of the engine design is the attachment of the head to the block. During operation, the threads in the block are destroyed, breaking the tightness of the connection. After this, antifreeze leaks or gas leaks from one cylinder to another appear. Toyota produces special threaded bushings that are screwed into the body of the block. After 2007, the defect does not occur since the unit was modernized.
If fuel consumption is increased on the 1AZ FSE engine, it is recommended to conduct computer diagnostics of the operating parameters of the injection system. One of the defects is low pressure of the first pump. The cause is deposits on the filter element installed in the fuel tank. The part is washed with carburetor cleaner or replaced.
At the same time, it is recommended to inspect the fine fuel filter located inside the fuel module located in the tank. Repair consists of replacing the part. When assembling the module, it is necessary to install the parts correctly, since an error during installation leads to a stop in the supply of gasoline.
Noise from the intake manifold at low engine speeds or at idle. Design defect; repair requires installation of an upgraded part.
Engine vibrations at idle speed. They arise due to design features. You can wash the throttle and injector, check the condition of the supports. The vibrations decrease, but do not disappear completely.
Jerks when picking up speed indicate contamination of the throttle assembly and the valves that regulate the geometry of the intake manifold. It is necessary to clean the parts from carbon deposits.
Some engines are equipped with an exhaust gas recirculation system, which contributes to the formation of carbon deposits in the intake manifold. Because of this, the control unit does not work correctly, especially when starting a cold engine.
A defect in the ignition system is the breakage of the coil tips. This causes misfires. Repair consists of replacing the damaged part.

Weaknesses and disadvantages of the 1AZ-FE engine

The manufacturer does not indicate the exact service life of the 1AZ-FE engine. But a mileage of 300 thousand km with proper maintenance will not cause problems with the engine. With high reliability, troubles arise; this unit cannot be called absolutely problem-free.

Carter - also known as the upper part of the oil pan 1AZ

Malfunctions appear after a longer mileage, when parts and mechanisms are subject to wear.

Breakdowns and elimination:

The cylinder head mounting thread is broken. Externally it appears as antifreeze leaks on the rear wall. This design miscalculation can lead to overheating, geometry failure, and the block can be thrown away. The problem is solved by improving the threads of the existing cylinder block or installing a new block with an improved modification. The problem of weak cylinder head threads was corrected by Toyota in 2007.

The oil pump is located in the crankcase and is driven by an additional chain.

Increased engine vibration at idle speed can be treated by cleaning the throttle, idle air valve, injectors, EGR system (only 1AZ has it on the Japanese market), and replacing the support pads.
When carbon deposits appear in the unit, jerky operation of the 1AZ engine is felt, associated with a dirty throttle valve or intake manifold. If cleaning them does not bring results, then the reason is the VVT-i clutch or the lambda probe.
In Japan, the power unit was equipped with an EGR system, which resulted in the formation of carbon deposits and floating speed, followed by a loss of traction, a general delay in the operation of the machine, and an increase in fuel consumption. This disadvantage can be corrected by turning off the valve.
The geometry fails when the internal combustion engine overheats, which leads to replacement with a contract motor.
Using gasoline below AI-95 leads to malfunction of the fuel pump and injectors.

The oil pump is located in the crankcase and is driven by an additional chain.

Maintenance schedule 1AZ FE 2.0 l/145 l. With.

Initially, the Toyota manufacturer's manual contains not only a description of the parameters, but also the timing within which the 1AZ FE engine must be serviced:

crankcase ventilation requires cleaning after 2 years of operation;
the service life of the spark plugs and battery is 10 and 40 thousand km, respectively;
The manufacturer recommends adjusting the thermal clearances of the valves after 30,000 km;
antifreeze and engine oil lose their properties after 20 and 10 thousand mileage, respectively;
in TSI modifications, oil changes are performed more often - after 7.5 thousand;
The developer recommends updating the attachment belts every 40,000 km;
in the catalytic collector, individual sections begin to burn out after 60,000 km.

Cleaning the throttle valve

The internal combustion engine device is ideal for independent maintenance; all areas are accessible and no expensive equipment is required.

Tuning and modification of the 1AZ engine

Correction of the block program to increase engine power to 165-170 horsepower;
Elimination of EGR, catalyst, factory restrictions and software blocks, installation of a direct-flow muffler.
The TRD compressor fits well on the engine. It will require the installation of new injectors, intercooler, blowoff, etc. The piston group will remain the same with an increase in potential to 200 hp;
When boring the cylinder block, you will get a 2AZ engine with a volume of 2.4 liters and quite a lot of thrust.

Any tuning will negatively affect the life of the engine.

Where was the 1AZ-FSE installed?

In our geographical latitudes, the 1AZ-FSE D-4 power unit was installed mainly on Avensis and Rav-4

Avensis and Avensis Verso;
Noah;
Voxy;
RAV-4;
Gaia;
Opa;
Isis;
Ipsum;
Premium;
Wish;
Allion;
Caldina.

Despite a lot of conflicting data, 1AZ-FSE is used perfectly by many owners of Japanese cars. Due to the direct supply of fuel to the combustion chambers, the condition of the unit is too strongly influenced by the quality of this fuel itself. This explains why in the CIS countries the engine has a largely negative attitude among motorists.

Design Features

The main achievement of the 1AZFE modification engine is the lightweight aluminum cylinder block and the VVT-i gas distribution system. The system consists of an electronic throttle valve. This makes the motor work stable. And the displacement of the crankshaft axis increases the service life of the liners.

The main disadvantage of the Japanese engine modification 1AZFE is the thermostat. It begins to act up in the harsh Russian winters. There are no problems with the generator. The generator can only be repaired after a mileage of 200 thousand kilometers.

Another feature of the budget engine is its operation on a lean mixture. Since injection occurs in the cylinders. Then the fuel evaporates and rises to the spark plugs, where the gas mixture is ignited.

Attention! The gearboxes for this 1AZFE engine are mechanical and automatic. If the engine works well with the mechanics, then with the four-speed automatic transmission there are problems with the forced engagement of the transmission. Experienced mechanics say that this is a problem with the automatic transmission rather than the 1AZFE engine.

Toyota powertrain design

The lightweight aluminum cylinder block and the excellent VVT-i gas distribution system were important achievements of the unit. The electronic throttle made the engine easier to operate, made it more stable and eliminated a number of potential breakdowns. The cylinder axis has a design feature - an offset relative to the crankshaft axis. This was done to increase the service life of the sleeves.

The plant did not determine the service life of the engine, but reviews allow us to form an opinion about the service life of the unit. A mileage of 300,000 km is considered normal. With higher mileage, problems arise that indicate serious wear and tear of the main mechanisms and parts.

The attachment runs for a long time and does not cause problems. The generator on some cars requires replacement after 200,000 km. In the cooling system, problems can only be caused by the thermostat, which does not like the Russian winter. The valve mechanism itself, as well as the entire cylinder head system, do not cause problems. It is important to monitor operating conditions and ensure good maintenance.

Gearboxes for 1AZ engine

The boxes were installed with traditional mechanical and automatic ones. The 6-speed manual serves quite well and does not cause any problems. Automatic machines are distinguished by unconventional behavior in D4 modes and some variants of forced transmission engagement. But this is not a question for the engine, but for the automatic transmission itself. The structure of the box is quite complex, and one of the big problems for owners of such cars with an automatic transmission will be the high cost of repairs.

List of internal combustion engine modifications

In total, the 1AZ series has two engine modifications. Let's look at what models these are:

1AZFE. This is what we are talking about at the moment. This motor appeared in 2000 and is still produced to this day. This is the base model, with compression ratios of 9.6 and 9.8;
1AZFSE (D4). It differs in compression ratio, as the following parameters 10.5 and 11 have been added. The engine power has been slightly increased. If the first model has a maximum of 150 hp, then the second model has 150 - 155 hp.

Let's look at the positive and negative aspects of these two AZFE series models.