Carbon on Valves? Proper Intake Cleaning. • In this video, we take a close look at the process of cleaning intake valves from carbon buildup, which forms due to the operation of the EGR (Exhaust Gas Recirculation) system. Over time, carbon deposits accumulate on the intake valves, inside the intake manifold, and on the EGR air flaps, negatively affecting engine performance and drivability. • This video focuses specifically on removing carbon deposits directly inside the cylinder head. To do this