Vehicles using AJ-V8 4.2 SC engine list:

Engine AJ-V8 4.2 SC is known for occasional issues with timing chain tensioners, leading to rattling noises and potential timing misalignment. Diagnose by listening for unusual engine sounds at startup and inspecting the timing chain area. Prevent problems by adhering to regular oil changes with high-quality synthetic oil to maintain proper lubrication. Another common issue is carbon buildup on intake valves, causing rough idling or reduced performance; use fuel system cleaners periodically and consider professional intake cleaning. If misfires occur, check ignition coils and spark plugs. Address any coolant leaks promptly to avoid overheating. Regular maintenance and timely repairs ensure engine longevity and reliability.