The 2007 Hummer H3 uses a 3.7-liter inline-5 engine.
In 2007, H3 power was centered on GM's 3.7L inline-5, delivering roughly 242 horsepower and 242 lb-ft of torque. It paired with a five-speed automatic transmission and a four-wheel-drive system designed to handle both on-road performance and off-road work.
Engine specifications
Key technical details of the 3.7L inline-5 powering the 2007 H3, including output and drivetrain pairing.
- Displacement: 3.7 liters (3700 cc)
- Configuration: inline-5 (I-5)
- Horsepower: about 242 hp
- Torque: about 242 lb-ft
- Transmission: 5-speed automatic
- Drivetrain: four-wheel drive with a transfer case for off-road use
These specs reflect the standard 2007 H3 setup and illustrate how the model balanced on-road usability with off-road capability.
Variations and later developments
Although the 2007 H3 primarily used the 3.7L inline-5, GM expanded the lineup later with a more powerful option for the Alpha trim.
2009 H3 Alpha: 5.3L V8 option
In 2009, Hummer introduced the Alpha variant, offering an optional 5.3-liter V8 to boost power and towing capability.
- Engine: 5.3L V8 (GM small-block)
- Power: around 300 hp
- Torque: around 320 lb-ft
The standard 3.7L inline-5 remained the baseline engine for the regular H3, while the Alpha trim provided a V8 alternative for buyers seeking extra performance.
Summary
The 2007 Hummer H3 is powered by a 3.7-liter inline-5 engine, producing approximately 242 horsepower and 242 lb-ft of torque. It is paired with a 5-speed automatic transmission and a four-wheel-drive system, with a later Alpha variant offering a 5.3-liter V8 as an option for increased power and towing capacity.
What kind of engine does a 2007 Hummer H3 have?
Engine
| Base engine size | 3.7 L |
|---|---|
| Cylinders | Inline 5 |
| Base engine type | Gas |
How much is a 2007 Hummer H3 worth today?
The value of a used 2007 HUMMER H3 ranges from $1,563 to $4,475, based on vehicle condition, mileage, and options. Get a free appraisal here.
Is the 5 cylinder in the Hummer H3 a good engine?
The Hummer H3 comes with a 3.7-liter 242-horsepower five-cylinder engine that most writers feel is fine for off-road driving but only adequate, if that, for breezing down paved roads. It has the torque required to crawl over boulders, but is short on the horsepower needed for the freeway.
What are common problems with the H3?
Top Hummer H3 Problems
- Worn Valve Seats May Cause Engine Misfire.
- Check Engine Light Due to Gas Cap Issue.
- Hummer H3 antifreeze leak due to cracked plastic radiator causing coolant odor and low levels.
- Reduced Power and Check Engine Light.
- Service transmission every 30,000 miles.
- Fuel Level Sensor Failure.