Engine Toyota 1AZ

Engine Toyota 1AZ

Engines of the 1AZ series appeared on Toyota cars since 2000 – they gradually replaced the legendary motors of the S series and for ten years remained the main “medium-capacity” of the company. Installed on a large number of front-wheel drive models of classes “C”, “D”, “E”, vans, medium and full-size SUVs.


Manufacturer Kamigo Plant
Shimoyama Plant
Also called 1AZ
Production years 2000
Cylinder block alloy aluminum
Fuel system injector
Configuration inline
Number of cylinders 4
Valves per cylinder 4
Piston stroke, mm 86
Cylinder bore, mm 86
Compression ratio 9.6
Displacement, cc 1998
Power output, hp 145/6000
Torque output, Nm / rpm 190/4000
Fuel type 95
Euro standards Euro 5
Weight, kg 131
Fuel consumption, L/100 km
— city
— highway
— combined
Oil consumption, gr/1000 km up to 1000
Recommended engine oil 0W-20 / 5W-20
Engine oil capacity, liter 4.2
Oil change interval, km 10000
(better 5000)
Normal engine operating temperature, °C
Engine lifespan, km
— official information
— real


Engine Toyota 1AZ under the hood

Frequent problems

  1. The block thread has broken off at the cylinder head attachment point. Symptoms that are similar for all AZ versions: the appearance of antifreeze on the back wall, an increase in temperature and a curvature of the geometry. The threads can be repaired, but if the block is damaged it will need to be replaced – preferably for a 2007 and later model.
  2. Vibrations when working without movement. Observed at low revs. The disadvantage is a characteristic disease of the motors of this series. It can be partially corrected by cleaning the idle valve, injectors, throttle valve, DMRF in EGR and adjusting the pillows.
  3. Motor twitching. The reason lies in the formation of carbon deposits in the intake manifold and the throttle block. They need to be cleaned. The lambda probe and VVTi may also be faulty.
  4. Carbon deposits in the EGR valve. It manifests itself as swimming revs and loss of power. The valve must either be cleaned or simply closed with a plug.
  5. Overheating. The motor may bend. As a result, it will need to be changed.

In addition, FSE modifications are very sensitive to fuel (injectors and high pressure fuel pumps often fly). If you take care of the Toyota 1AZ engine, then its service life can exceed 300 thousand km.

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