Most newer gasoline vehicle are direct injection, which means the injectors spray gasoline into the air intake manifold where fuel and air mix together into a fine mist. Compared to other engines where the gasoline hangs out in the air intake manifold these engines have the fuel squirt directly into the combustion chamber. Our BG GDI Service cleans the fuel injectors, throttle body, plenum, air intake, intake valves and ports. It also removes combustion chamber deposits and corrects balance of fuel and air in the system. Symptoms you may notice when your vehicle is in need of this service include poor fuel economy, loss of power, hard starting, pinging/knocking or increased emissions. BG recommends this service be done every 15,000 miles.