What is a common consequence of contaminated air filters on engine performance?

• A. Reduces air flow, lowers power, increases wear, and can cause misfires.
• B. Increases fuel efficiency and power.
• C. Has no effect on engine performance.
• D. Only affects exhaust emissions.

Answer: (A)

Air flow is essential for proper combustion, and a dirty or contaminated air filter acts like a choke in the intake. When the filter is clogged, less air reaches the cylinders, so the engine can’t burn as much fuel as it normally would. That reduction in air flow means the engine loses power and throttle response suffers. The engine management system may also run the mixture differently to compensate, which can lead to rough running or misfires. In addition, debris and dirt that aren’t filtered out can reach internal surfaces, increasing wear on intake components and other engine parts. For these reasons, contaminated air filters commonly cause a drop in power, potential misfires, and accelerated wear, making it the most accurate description of the consequence.