Toyota 3UZ-FE 4.3L Engine Specs, Problems, Reliability. The 3UZ-FE engine was first introduced in 2000 and was a result of the advancement of the 4.0-liter 1UZ-FE engine. The 3UZ grown in displacement approximately 4.3 liters and it was packed with all present Toyota’s electronic devices and systems, the like in late 1UZ engines with VVTi.
The 3UZ-FE has aluminum cylinder block with increased bore measure to 91.0 mm while the stroke wasn’t changed (82.5 mm). The brand-new block had exact same 90 degrees ‘V’ angle, 21 mm cylinder bank offset, and 105.5 mm bore pitch. The new cast-iron cylinder liners are thinner by 0.5 mm (1.5 mm instead of 2 mm). The thinner sleeves/liners are lighter, provide better cooling, however at the same time losing strength. For enhancing rigidity, the thickness of the cylinder walls was increased by 1 mm (from 5.5 mm to 6.5 mm).
Engineers optimized the water passage shape in between the bores. Like the 1UZ-FE, the 3UZ-FE engine was geared up with a created steel crankshaft (completely balanced with 5 primary journals and eight counterweights), forged steel linking rods, lightweight aluminum pistons with steel struts and drifting type piston pins. The engine pistons are not just increased in diameter however likewise have actually raised the position of the piston rings.
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Toyota 3UZ-FE 4.3L Engine Specs, Problems, Reliability
The 3UZ-FE cylinder heads are nearly the very same. The chamber shape was changed due to the enlarged cylinder bores. In the rest, the engine heads resemble the late 1UZ-FE heads with VVT-i. There are 2 camshafts (timing belt drives intake camshaft, and the exhaust camshafts are driven by equipments on the intake camshaft), four valves per cylinder, strong lifters, and big valves (intake valve size – 34.5 mm; exhaust valve size – 29.0 mm; both valve stem diameters – 5.5 mm).
All 3UZ-FE engines have the Variable Valve Timing – intelligent or VVT-i system and Toyota’s variable length (geometry) consumption manifold named ACIS (Acoustic Control Induction System). Each cylinder has a specific ignition coil which more compact and light-weight compared to 1UZ-FE coils. The engine heads were fitted with iridium-tipped spark plugs located in the middle of the cylinders. The ignition of the 3UZ-FE is controlled by both the DIS (Direct Ignition System) and ESA (Electronic Spark Advance) systems.
For faster warm-up of the catalytic converters, the 3UZ-FE has stainless-steel exhaust headers/manifolds with shorter front exhaust pipes compared to the 1UZ-FE. Of course, the possibilities of modern cars need the electronically managed throttle. In this case, the 3UZ-FE has ETCS-i system (Electronic Throttle Control System). This system monitors the idle speed (ISC system), the cruise control system, the traction control system (TRAC) and the vehicle skid control system (VSC) in Toyota’s cars.
The 3UZ-FE was cut of the production in 2010. The brand-new generation of Toyota’s V8 engines (the UR household) changed 3UZ-FE with the brand-new 4.6-liter V8 engine – the 1UR-FSE/FE.
Toyota 4.3 V8 3UZ-FE Engine Problems and Reliability
Like its predecessor and all UZ family, the 3UZ-FE is very reputable and very resilient engine. It has no standard problems or style issues. Make required upkeep, usage premium oil, fuel, initial Toyota’s parts (filters, bolts, etc) and the 3UZ-FE engine will run more than 300,000 miles (500,000 km).
Like nearly every modern-day engine with a timing belt. The broken timing belt will destroy the 3UZ engine. Replacing of timing belt should be made every 60,000 miles (100,000 km) or early if you discovered any damages on it.
Toyota 3UZ-FE 4.3L Engine Specs
|Cylinder block material||Aluminum|
|Cylinder head material||Aluminum|
|Fuel system||Fuel injection|
|Number of cylinders||8|
|Valves per cylinder||4|
|Bore, mm||91.0 (3.58)|
|Stroke, mm||82.5 (3.25)|
|Displacement, cc||4,292 cc (261.9 cu in)|
|Type of internal combustion engine||Four-stroke, naturally aspirated|
|Power, hp||282-304 hp (207-223 kW)/5,600|
|Torque, lb ft||307-325 lb-ft (417-441 Nm)/3,400-3,500|
|Engine weight||386 lbs (175 kg)|
|Engine oil weight||5W-30|
|Engine oil capacity, liter||5.2 (5.5 quarts)|
|Oil change interval, mile||9,000 (15,000 km) or 12 month|
|Applications||Lexus LS 430, Lexus GS 430, Lexus SC 430, Toyota Soarer, Toyota Crown Majesta, Toyota Supra GT500|