Engine Overview and Common Failures
The weight of the 3UZ-FE engine according to the catalog is 225 kg. The engine number 3UZ-FE is located between the cylinder heads. The loosening of the bolts of the ACIS system. These engines are equipped with an intake geometry control system ACIS with throttle valves. There are quite a few cases described on forums of these throttle valve bolts coming loose and then entering the cylinders, causing deep scoring. Timing belt failure. Replacing the timing belt can be expensive and some greedy owners do not follow the schedule. However, it is always important to remember that in case of belt failure, the valves are most likely to bend. Minor breakdowns. Among the minor problems of these units, we can include a short pump lifespan and thermostat, frequent oil leaks from seals, and occasional glitches in the electronic throttle ETCS-i.