What does a 2003 Ram 1500 4.7L have instead of EGR?

The 2003 Ram 1500 4.7L engine does not have an EGR (Exhaust Gas Recirculation) valve. Instead, it uses a VSV (Vacuum Switching Valve) to control the flow of exhaust gases into the intake manifold. The VSV is operated by the PCM (Powertrain Control Module) and opens and closes based on engine operating conditions. When the VSV is open, exhaust gases are allowed to flow into the intake manifold, which helps to reduce NOx emissions. When the VSV is closed, exhaust gases are not allowed to flow into the intake manifold, which helps to improve fuel economy.