Trying to diagnose a minor glitch in engine performance, especially when there are no Diagnostic Trouble Codes (DTCs) to provide some type of guidance, is one of the tougher challenges a drivability tech faces.
Forced induction – it’s about numbers. Numbers matter. Ask your accountant. Ask your customer. Ask an engine builder. One number an engine builder loves is the one for an engine’s volumetric efficiency, or VE.
Google “gasoline direct injection problems,” and it won’t take you long to see that many early adopters of this technology faced issues with severe carbon buildup occurring on the stem and throat of the intake valve.
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