The 4.0L 1GR-FE is the powerhouse that defined the “Late Fourth Gen” 4Runner (2005–2009). As the first engine in the GR family, it was designed to replace the aging 3.4L V6, providing a massive jump in horsepower and towing capability while maintaining Toyota’s strict “overbuilt” engineering philosophy.
The 2005–2009 version of this engine features Single VVT-i (on the intake side), which differs from the Dual VVT-i found in the later 2010+ models.
| Component | Specification |
| Engine Code | 1GR-FE (Single VVT-i) |
| Configuration | 60° V6, Aluminum Block & Heads |
| Displacement | 4.0 Liters (3,956 cc) |
| Horsepower | 236 hp @ 5,200 RPM |
| Torque | 266 lb-ft @ 4,000 RPM |
| Timing Drive | Heavy-Duty Timing Chain |
| Valvetrain | DOHC, 24-Valve |
The GEN1 4.0L is highly sought after by overlanders and off-roaders because of its torque-to-weight ratio.
Low-End Grunt: Unlike many modern V6 engines that need to scream at high RPMs to make power, the 1GR-FE provides significant torque early in the power band—perfect for climbing obstacles or merging with a loaded trailer.
Timing Chain Durability: This engine eliminated the 90,000-mile timing belt service required by previous generations. The 1GR-FE chain is designed to last the life of the engine.
Simple Serviceability: Despite being a modern V6, the engine bay of the 4th Gen 4Runner is spacious, making items like the alternator, starter, and spark plugs relatively easy to access.
While these engines are legendary for hitting 300,000+ miles, they have specific requirements to stay healthy:
Early 1GR-FE engines (2003 to mid-2005) had a known weakness in the head gasket design. However, by the 2006–2009 models, Toyota updated the gasket material and design, virtually eliminating the issue. If you have a 2005, monitor for unexplained coolant loss.
Unlike many Toyota engines that use 100k-mile Iridium plugs, the GEN1 1GR-FE was factory-equipped with Standard Copper Plugs (typically Denso or NGK).
Service Interval: Every 30,000 miles. Running these plugs too long can stress the ignition coils.
The 1GR-FE is sensitive to oil quality for its VVT-i operation. Use a high-quality 5W-30 oil. If you see a “VSC/TRAC” light accompanied by a Check Engine light, it is often a dirty VVT-i solenoid or a gas cap seal—don’t panic, but don’t ignore it.
The aluminum block does not tolerate overheating. If your radiator is original (15+ years old), consider a preventative replacement. Plastic end tanks on radiators are the primary failure point that leads to engine-killing heat.
In the 2005–2009 4Runner, this engine was paired with a 5-speed automatic transmission, a significant upgrade over the 4-speed found in earlier models.
Towing Capacity: Properly equipped, the V6 4Runner is rated to tow up to 5,000 lbs.
Modifications: The 1GR-FE responds very well to high-flow air filters and “cat-back” exhaust systems, which give the truck a deep, truck-like growl without being overly loud.
The 2005–2009 Toyota 4Runner 4.0L represents the peak of “mechanical” 4Runners before the electronics became overly complex. It is a rugged, high-torque engine that balances daily drivability with legendary reliability. Keep the oil clean and the cooling system fresh, and this motor will likely outlast the frame of the vehicle.
condition: Remanufactured
guarantee: 6 Months
engine size: 4.0L
fuel type: Gasoline
number of valves: 24
number of cylinders: 6-Cylinder
performance : Non Turbo
compression ratio : 10
bore diameter mm : 94
maximum horsepower ps : 243
maximum power kw : 179
maximum power speed rpm :
make : Toyota
model : 4Runner
displacement : 4.0L
maximum torque n m : 376
maximum torque speed rpm : 5200
dimension : 31×26 x 38 inch
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