In a traditional gas engine, fuel is sprayed from injectors in the intake port to the engine cylinder. To understand how carbon builds up inside your engine, we first need to understand the process of fuel injection. Unfortunately, most vehicle owners aren’t made aware of the additional needs of their GDI engine – at least, not until they roll into the local service shop with the ‘check engine’ light on. Technically the remnants of oxidized fuel, this build up is easy to manage with regular maintenance. Offering noticeable improvements to fuel efficiency, this high performance system comes with a downside the average driver doesn’t know about: intake valve gunk. Once confined to diesel and high end gas vehicles, direct injection engines have gone mainstream in recent years. What to do to keep your fuel intake valves from becoming this
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