Chevrolet Suburban 1500 engine failure due to AFM issues and #4 #7 head failure on Chevrolet Suburban 1500

Some Chevrolet Suburban 1500 owners report experiencing engine failures related to Active Fuel Management (AFM) issues, which can lead to reduced horsepower and torque as well as overall low performance. Common AFM lift failures in Chevy trucks have been linked to engine misfires on specific cylinders, such as 1, 4, 6, or 7, accompanied by valve train tick noises and diagnostic trouble codes like P0300. Many owners have noted that the primary causes of AFM lifter failure include oil-related issues, mistimed switching events, and typical wear and tear, often occurring around 70,000 to 80,000 miles. Symptoms of AFM lifter problems reported by owners include sudden stalls while driving, engine grinding noises, and the risk of serious engine damage if these issues are not promptly addressed. Regular maintenance and quick resolution of any AFM-related symptoms are crucial for maintaining engine health in the Chevrolet Suburban 1500.