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Which outcome occurs when wastegate failures block boost pressure regulation?

A)Engine knock and detonation increase
B)EGT margins significantly improve
C)Volumetric efficiency decreases sharply
D)Intake manifold pressure becomes stable

💡 Explanation

Increased boost pressure, without wastegate regulation, causes extreme cylinder pressures; autoignition occurs because uncontrolled compression increases temperature beyond the fuels flash point. Therefore, engine knock increases; rather than improving as may happen under normal operations controlled by boost levels.

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