The GM LX9 is a 3,510 cc, naturally aspirated V6 petrol engine produced between 2005 and 2009. It features overhead valve (OHV) architecture with two valves per cylinder and sequential fuel injection. Peak output is rated at 147 kW (200 PS) and 302 Nm of torque, providing smooth, linear power delivery for mid — size applications.
Fitted primarily to the Chevrolet Equinox, Pontiac Torrent, and Saturn Vue, the LX9 was engineered for drivers seeking dependable, everyday perf…
Production years 2005–2009 meet U.S. Tier 2 Bin 5 and Euro 4 standards (EPA Certificate of Conformity #A-05-001).
The GM LX9 is a 3,510 cc V6 naturally aspirated petrol engine engineered for mid-size SUVs (2005-2009). It combines OHV architecture with sequential fuel injection to deliver smooth, low-RPM torque and confident everyday performance. Designed to meet U.S. Tier 2 Bin 5 and Euro 4 standards, it balances power with emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,510 cc | |
Fuel type | Petrol | |
Configuration | V6, OHV, 12-valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 99.0 mm × 84.0 mm | |
Power output | 147 kW (200 PS) @ 5,200 rpm | |
Torque | 302 Nm @ 4,000 rpm | |
Fuel system | Sequential Multi-Port Fuel Injection (SFI) | |
Emissions standard | U.S. Tier 2 Bin 5 / Euro 4 | |
Compression ratio | 9.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 169 kg |
The GM LX9 was used across GM's Theta platform SUVs with transverse mounting and no external licensing. This engine received platform-specific adaptations-unique engine mounts and accessory drive layouts for the Equinox versus the Vue-creating minor service part differences. All adaptations are documented in OEM technical bulletins.
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The LX9's primary documented service focus is potential intake manifold gasket failure, with elevated incidence in high-mileage vehicles. GM internal data from 2007 indicated a subset of engines required gasket updates, while NHTSA data shows no significant safety recalls. High-mileage driving cycles make adherence to the revised service procedure critical.
Analysis derived from GM technical bulletins (2005-2009) and NHTSA recall data (2005-2009). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The GM LX9 is generally robust, with its simple OHV design reducing complexity. The primary concern is intake manifold gasket failure, which is addressed by a factory service bulletin. With regular maintenance using dexos1™ oil and attention to the intake manifold, it should provide dependable long-term service.
The most common documented issues are intake manifold gasket failure, exhaust manifold bolt breakage, knock sensor failure, and valve cover gasket leaks. These are addressed in GM service bulletins and are generally manageable with proper maintenance.
The LX9 engine was found in the Chevrolet Equinox, Pontiac Torrent, and Saturn Vue from the 2005 to 2009 model years. It was not used in any other GM vehicles or beyond the 2009 model year.
Yes, the LX9 can be tuned. An ECU remap can yield modest gains of 10-15 kW by optimizing ignition and fuel maps. Bolt-on modifications like a performance exhaust and cold air intake can add further gains. Significant power increases require internal modifications.
Fuel economy is typical for a 3.5L V6 of its era. In a Chevrolet Equinox FWD, expect around 13.8 L/100km (city) and 9.8 L/100km (highway), or approximately 21 mpg (US) combined. Real-world figures vary based on driving style and vehicle weight.
No. The GM LX9 is a non-interference engine. If the timing chain were to fail, the pistons would not contact the open valves, preventing catastrophic internal damage. The engine would simply stop running, requiring a timing chain replacement.
GM mandates the use of dexos1™ full synthetic oil, typically in 5W-30 viscosity. Using the correct specification is critical for the health of the timing chain and to minimize wear. This is non-negotiable for warranty compliance and engine longevity.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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