What is the result of extremely dirty air filters?

Extremely dirty air filters can significantly hinder an engine's performance. The primary function of an air filter is to trap dust, dirt, and other contaminants from the air entering the engine for combustion. When these filters become clogged with debris, they restrict airflow into the engine, which can lead to several issues.

With insufficient air entering the engine, the air-fuel mixture becomes unbalanced, often leading to a lean condition, where there is more fuel than air. This can cause rough idling, decreased throttle response, and reduced acceleration. Additionally, poor airflow can lead to incomplete combustion, which may produce more emissions and potentially damage engine components over time. Therefore, maintaining clean air filters is crucial for optimal engine performance.