Engine Overview and Common Failures
The weight of the 3S-FSE engine according to the catalog is 150 kg. The engine number 3S-FSE is located at the junction of the block with the gearbox. The most well-known and common problem of this engine is the failure of the fuel pump. Due to severe wear, the pump starts pushing gasoline into the crankcase and dilutes the oil. I don't think it's necessary to explain the consequences of this mixture for the rubbing surfaces of the engine. Due to the aggressive operation of the EGR valve, the intake manifold quickly gets clogged with carbon deposits, followed by a malfunction of the variable geometry system, and the engine starts to suffocate and stall. Another issue that this power unit faces is the problem with low-quality connecting rod bolts, just like in the 3S-FE, which leads to the destruction of the cylinder block. In addition to the intake camshaft, the timing belt also drives the oil pump and the water pump, which often seizes. Moreover, in case of belt breakage or skipping, the valves can bend. All other engine flaws can be listed together, and there are quite a few of them. After 200,000 km, the engine often consumes oil and vibrates due to worn bearings. The sensors have low reliability, and there are difficulties with diagnostics as well. There are no hydraulic compensators here, so don't forget to periodically check the valve clearances.