The Smog Pump: How it Works and Why it Matters for Your Vehicle The smog pump, also known as an air injection pump, is an essential component of your vehicle's emission control system. It is responsible for injecting fresh air into the exhaust system to help reduce harmful emissions. In this article, we will discuss how the smog pump works and why it matters for your vehicle. How the Smog Pump Works The smog pump is typically driven by a belt connected to the engine's crankshaft. It draws in fresh air from the air filter and pumps it into the exhaust system through a series of hoses and valves. The fresh air mixes with the hot exhaust gases, which helps to burn off any unburned fuel and reduce harmful emissions. The smog pump is controlled by the vehicle's engine control module (ECM), which monitors the engine's performance and adjusts the air/fuel mixture accordingly. If the ECM detects that the engine