Engine Air Filter
A paper or fabric filter that prevents dust, dirt, and debris from entering the engine's combustion chambers.
The engine air filter is a vital maintenance component designed to clean the air drawn into the engine for combustion. Because an engine consumes thousands of gallons of air for every gallon of fuel burned, the air filter plays a crucial role in preventing dirt, dust, sand, pollen, and other environmental debris from entering the cylinders.
Without a functional air filter, abrasive particles entering the combustion chamber would cause rapid wear on the piston rings, cylinder walls, and engine valves. Air filters are typically housed in a plastic box connected to the intake duct and are made of pleated paper, foam, or cotton materials.
Over time, the filter accumulates dirt and becomes clogged, restricting the flow of air. This alters the air-fuel ratio, forcing the engine computer to adjust fuel delivery. Symptoms of a dirty engine air filter include reduced fuel economy, sluggish acceleration, a rough idle, engine misfires, and a check engine light. In severe cases, it can cause black smoke to exit the tailpipe.
Replacing the engine air filter is a quick, inexpensive procedure. Most manufacturers recommend replacing it every 12,000 to 15,000 miles, or more frequently if you regularly drive in dusty, dry, or heavily polluted environments.