In direct fuel injection (DI) engines, fuel is sprayed directly into the combustion chamber instead of through the intake valves. That means the fuel no longer washes the valves clean, allowing carbon and oil residue from the crankcase ventilation system to build up over time. This buildup can cause: Rough idle or misfires Power loss Poor fuel economy Check-engine light for intake valve issues Hesitation or sluggish acceleration | Ron's Auto Repair of Mankato
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