Engine load is the primary controlling factor that determines the amount of engine vacuum produced.

Question

Quizplus · Accepted Answer

Engine load (measured by throttle position, for example) affects the amount of air flowing into the engine, which in turn affects the pressure differential between the intake and exhaust sides. This pressure differential creates engine vacuum, which is used to power various systems such as power brakes and HVAC controls. Therefore, engine load is the primary controlling factor for engine vacuum.

Engine Load Is the Primary Controlling Factor That Determines the Amount