Carbon buildup on intake valves for Audi, Volkswagen, BMW and Mini
Carbon may be the building block of life, but it can wreak havoc on your engine.
Audi, Volkswagen, BMW and Mini engines utilize direct injection of fuel into the cylinder. Direct injection is where the fuel is sprayed at a very high pressure, directly into the cylinder through fuel injectors. The engine control module, or ECU, precisely controls all aspects of fuel injection, including the amount of fuel injected, timing, air to fuel ratio, how long the valves stay open and more. This process achieves better fuel economy and power because the combustion of fuel is more complete and the fuel burns more efficiently.
Air intake valves in all engines are exposed to air mixed with [...]