Cadillac STS 2005-2011 4.4L Engine Specifications

The 4.4L engine in the 2005-2011 Cadillac STS is a Northstar LC3 V8 engine, featuring a 4.4-liter displacement, 32 valves, and a dual-overhead camshaft design. It produces 292 horsepower at 6,000 rpm and 288 lb-ft of torque at 4,600 rpm. This engine is compatible with premium fuel and features variable valve timing for improved performance and efficiency.

Regular maintenance for the 4.4L engine includes oil changes every 5,000 to 7,500 miles using synthetic oil, tire rotations every 7,500 miles, and spark plug replacements every 100,000 miles. The engine coolant should be changed every 50,000 miles, and the air filter should be replaced every 15,000 to 30,000 miles. It's also important to inspect the belts and hoses at recommended intervals.

To install or replace parts on the 4.4L engine, ensure the vehicle is on level ground and the engine is cool. Disconnect the battery to prevent any accidental starts. Follow proper torque specifications for bolts and fasteners. For complex replacements, such as the water pump or timing chain, refer to a certified service manual or consult a professional mechanic.

Common issues with the 4.4L engine include rough idling, decreased performance, or illuminated check engine lights. Use an OBD-II scanner to retrieve trouble codes. Check for vacuum leaks, faulty oxygen sensors, or ignition coil issues. Addressing these problems early can prevent more severe damage. Always refer to the service manual for specific diagnostic procedures.

To optimize the performance of the 4.4L engine, ensure regular maintenance is up to date, including clean air filters and proper ignition system function. Use high-quality synthetic oil and premium fuel. Consider upgrading to a high-performance air intake or exhaust system for improved airflow. However, any modifications should be done cautiously and in accordance with manufacturer guidelines.