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 driving with an emphasis on mid-range power delivery. Emissions compliance was achieved through precise electronic throttle control and catalytic converters, meeting U.S. Tier 2 Bin 5 standards.
One documented concern is premature failure of the timing chain tensioner, which can lead to chain slap, noise, and potential misalignment. This issue, highlighted in GM Service Bulletin 09‑06‑01‑001, is often linked to inadequate lubrication or tensioner spring fatigue. GM later revised the tensioner design for improved durability.
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 DOHC/VVT design provides responsive, linear power but requires vigilance for the known timing chain tensioner weakness. Using the specified SAE 5W-30 oil and adhering to 5,000-mile change intervals is critical to ensure proper lubrication of the chain system. The high compression ratio demands premium (91+ octane) fuel for optimal performance and to prevent knock. Spark plug replacement is accessible but requires care to avoid damaging the coil-on-plug units. Vehicles exhibiting a rattle from the timing cover should have the tensioner inspected per GM bulletin 09-06-01-001.
Oil Specs: Requires SAE 5W-30 meeting API SM/SN specification (GM Owner's Manual). Dexos1 Gen 2 is a suitable modern equivalent.
Emissions: Tier 2 Bin 5 certification applies to all 2007-2011 LBS engines (EPA 3GAXV02.4LBAK).
Power Ratings: Measured under SAE J1349 standards. Output varies by model (e.g., 173 hp in Cobalt SS) (GM Powertrain Manual PTM-2400-07).
GM Technical Service Bulletins: 09-06-01-001
GM Service Manual SM-2400-01
U.S. Environmental Protection Agency (EPA) Engine Certification Database
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on a flat pad on the front of the engine block, near the timing cover (GM TIS 2400-001). The 8th digit of the VIN is 'P' for vehicles equipped with the LBS engine. Pre-2009 engines have an earlier-design tensioner (P/N 12620075) prone to failure; post-2009 units have a revised tensioner (P/N 12633352). Critical differentiation from the similar LE5 2.4L: The LBS has VVT on the intake cam only, while the LE5 has dual VVT (intake and exhaust).
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.
Find answers to most commonly asked questions about GM LBS.
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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VCA Certification Portal
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