Editor In Chief

Learn why an engine runs lean, how to spot the symptoms, and which sensor, air, fuel, or vacuum faults usually cause it.

Learn the most common timing chain symptoms, what they mean, and when to act before engine damage becomes expensive.

Learn the most common causes of a rich fuel mixture, how to diagnose it, and why it affects performance, emissions, and fuel economy.

Learn why an oil light flickers, which causes are serious, and how to diagnose low oil pressure before engine damage starts.

Learn the signs of dirty intake valves, how to inspect them, and what causes carbon buildup in modern engines.

Learn the key symptoms of timing belt failure, how to inspect for wear, and when to replace it before serious engine damage occurs.

A warm-stall can point to fuel, ignition, sensor, or air-management problems. Learn the most likely causes and how to diagnose them.

Learn the most common serpentine belt symptoms, what they mean, and how to tell belt problems from pulley or tensioner issues.

Learn what causes fouled spark plugs, how to spot the symptoms, and which engine, fuel, and maintenance issues lead to repeated fouling.

Oil in coolant usually points to a failing gasket, cooler, or engine component. Learn the causes, symptoms, diagnosis, and repair options.