Buick Regal 2011-2017 2.4L Engine Specifications

The 2.4L ECOTEC I-4 engine in the 2011-2017 Buick Regal features a dual-overhead cam design with four cylinders, producing 182 horsepower at 6,700 RPM and 172 lb-ft of torque at 4,900 RPM. It uses a multi-point fuel injection system, with a 11.4:1 compression ratio. The engine is paired with a 6-speed automatic transmission and is compatible with regular unleaded fuel. It meets ULEV emissions standards and offers an estimated EPA rating of up to 21 MPG city and 31 MPG highway.

Regular maintenance for the 2.4L engine includes oil changes every 5,000 to 7,500 miles using 5W-20 synthetic blend oil. Tire rotations should be performed every 7,500 miles, and the engine air filter should be replaced every 15,000 miles. Spark plugs should be replaced at 100,000 miles, and the coolant should be changed every 50,000 miles. It is also recommended to inspect belts and hoses at 50,000 miles and replace them as needed. Always refer to the owner's manual for specific recommendations.

To replace the air filter, locate the engine air filter housing on the driver's side of the engine compartment. Release the clips or screws holding the housing, open it, and pull out the old filter. Insert the new filter, ensuring it is properly seated and the housing is securely closed. For other installations, such as spark plugs, use a spark plug socket to remove the old plugs, gap the new ones to 0.040-0.050 inches, and tighten them to 15-20 ft-lbs. Always follow proper torque specifications and refer to the service manual for detailed instructions.

Common issues with the 2.4L engine include reduced power, rough idling, or decreased fuel efficiency. Start by checking the trouble codes using an OBD-II scanner. Look for issues such as faulty oxygen sensors, vacuum leaks, or ignition coil problems. Inspect the air filter for cleanliness and ensure the fuel cap is tight. For rough idling, check for worn spark plugs or a malfunctioning Idle Air Control valve. Consult the service manual for diagnostic procedures and repair steps.

To optimize performance, ensure regular maintenance is up to date, including oil changes and filter replacements. Use high-quality fuel and consider upgrading to synthetic oil for better engine lubrication. Install a high-flow air filter to improve airflow and consider aftermarket performance tuning to refine engine calibration. Avoid aggressive driving and maintain proper tire pressure to maximize fuel efficiency. For enhanced power, consider upgrading the exhaust system or adding a performance chip, but ensure modifications comply with emissions standards.