The GM LBS is a 2,384 cc, inline‑four petrol engine produced between 2007 and 2011. It features an aluminum block and head, dual overhead camshafts (DOHC), and variable valve timing (VVT) on the intake cam. This Ecotec engine delivered 164–177 hp and 159–166 lb‑ft of torque, balancing efficiency with responsive performance for compact applications.
Fitted to models such as the Chevrolet Cobalt SS, Pontiac G5 GT, and Saturn Sky, the LBS was engineered for sporty, agile dri…
All production years (2007–2011) meet U.S. Tier 2 Bin 5 standards (EPA Engine Family Code: 3GAXV02.4LBAK).
The GM LBS is a 2,384 cc inline-four petrol engine engineered for sport compact applications (2007-2011). It combines DOHC with variable valve timing to deliver responsive, linear power delivery. Designed to meet U.S. Tier 2 Bin 5 standards, it balances spirited performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,384 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 102.0 mm | |
Power output | 164–177 hp (122–132 kW) | |
Torque | 159–166 lb-ft (215–225 Nm) | |
Fuel system | Sequential multi-port fuel injection (SFI) | |
Emissions standard | U.S. Tier 2 Bin 5 | |
Compression ratio | 10.4:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven (with known tensioner issues) | |
Oil type | SAE 5W-30 API SM/SN | |
Dry weight | 309 lb (140 kg) |
The GM LBS was used across GM's Delta platform with transverse mounting and no external licensing. This engine received minor platform-specific adaptations-different engine mounts for the Cobalt versus the Saturn Sky-and from 2009 the tensioner was revised for improved durability, creating a key service part difference. All adaptations are documented in OEM technical bulletins.
The LBS's primary reliability risk is timing chain tensioner failure, with elevated incidence in high-RPM or poorly maintained vehicles. GM internal data indicated a significant number of warranty claims for tensioner replacement, while owner reports consistently cite a distinctive rattle as the first symptom. Extended oil change intervals and use of incorrect oil viscosity make the updated tensioner and strict maintenance critical.
Analysis derived from GM technical bulletins (2007-2011) and NHTSA complaint data (2007-2015). Repair procedures should follow manufacturer guidelines.
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The LBS is generally a robust engine with a solid design. Its main weakness is the original timing chain tensioner, which is prone to failure. With the updated tensioner installed and proper maintenance (especially oil changes), the LBS can reliably exceed 150,000 miles.
The most frequent issue is the failing timing chain tensioner, causing a noticeable rattle. Other common problems include VVT actuator/solenoid issues, oil leaks from the valve cover, and coolant leaks from the plastic thermostat housing. These are well-documented in GM service bulletins.
The LBS 2.4L Ecotec was used in several GM compact and sporty cars from 2007 to 2011, including the Chevrolet Cobalt SS, Pontiac G5 GT, Saturn Sky, and Opel Astra. It was the performance-oriented 2.4L for GM's Delta platform during that era.
The LBS has moderate tuning potential. Basic bolt-ons like a cold air intake and cat-back exhaust can yield 5-15 hp. More significant gains require ECU tuning, which can unlock 20-30+ hp by optimizing ignition and fuel maps, especially since it's designed for premium fuel.
Fuel economy is reasonable for a performance-oriented 2.4L. In a typical application like the Cobalt SS, expect around 22 mpg city and 30 mpg highway. Real-world combined fuel economy usually falls between 25-27 mpg, depending heavily on driving style.
Yes. The GM LBS is an interference engine. This means if the timing chain were to fail or jump, the pistons will contact the valves, causing severe internal engine damage. This makes addressing tensioner issues promptly critical.
GM recommends SAE 5W-30 motor oil for the LBS engine. The oil should meet the API SM or SN specification (or a newer equivalent). Regular oil changes every 5,000 miles are crucial for long-term engine health, particularly for the timing chain and VVT system.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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