Toyota 1FZ-FE
4.5 L · inline-6 · naturally aspirated · petrol · 1992–present
Also known as: 1fz-fe, 1fz, 1fz-f, 4.5 straight-six toyota, land cruiser 4.5
Toyota's 4.5 petrol straight-six — in the Land Cruiser J80 and J100 and the Lexus LX.
It is an iron-block straight six built for a vehicle expected to work in places with no dealer, and its reputation follows from that: unstressed, chain-driven, and very hard to kill.
Its known items are age rather than design. The head gasket goes on engines that have been overheated — which on a Land Cruiser usually means a neglected cooling system or a hard tow. The crankshaft pulley (harmonic balancer) separates at high mileage and presents as a wandering timing mark and a belt that will not stay aligned; it is worth inspecting before believing any timing reading on one of these.
It is thirsty and that is not a fault — an owner reporting poor economy on a 4.5 petrol Land Cruiser is describing the vehicle.
The 1FZ-F carburettor version exists in some markets and is a different diagnosis entirely: no engine management to read, and the fault list is fuel delivery and ignition timing.
Cars fitted with this engine
3 generations, across 2 makes. From the authored catalogue — an absent car means the catalogue has not reached it, not that the engine was never fitted.
Lexus
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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