Lexus GX 2010-present 4.6L V8 Engine Specifications

The 4.6L V8 engine in the Lexus GX produces 301 horsepower and 329 lb-ft of torque. It features Dual VVT-i (Variable Valve Timing with intelligence) for optimized performance and efficiency. The engine is paired with a 6-speed automatic transmission and is compatible with both 4WD and AWD systems. It meets ULEV-II emissions standards and is designed for premium unleaded gasoline.

Regular maintenance for the 4.6L V8 engine includes oil changes every 5,000-7,500 miles, air filter replacement every 30,000 miles, and spark plug replacement every 60,000 miles. The timing belt should be inspected every 90,000 miles and replaced if necessary. Coolant and transmission fluid should be flushed every 100,000 miles. Always refer to the owner's manual for specific intervals and procedures.

To replace the spark plugs, first, disconnect the battery. Remove the engine cover and ignition coils. Use a spark plug socket to remove the old plugs. Check the gap on the new plugs and install them, tightening to 13 ft-lbs. Reinstall the ignition coils and engine cover, then reconnect the battery. Start the engine to ensure proper operation.

If your engine is misfiring, first check the spark plugs and ignition coils for wear or damage. Inspect the fuel injectors and fuel system for clogs or leaks. Use an OBD-II scanner to check for error codes. If no issues are found, inspect the timing belt and compression levels. Consult a professional mechanic if the problem persists.

To optimize performance, use high-quality synthetic oil and premium fuel. Regularly clean or replace the air filter and ensure the throttle body is free of carbon buildup. Consider upgrading the exhaust system for better airflow. Regularly check tire pressure and alignment to reduce engine strain. Use a performance tuner for enhanced throttle response and power output.