What scenario is indicated by a loss of more than about 2 in. Hg of intake manifold vacuum as the RPM is increased?
A) The level of current flow
B) A 50 percent duty cycle
C) Excessive exhaust backpressure
D) The volume of air entering the engine

Question

Quizplus · Accepted Answer

Excessive exhaust backpressure can cause a loss of intake manifold vacuum as the RPM is increased because it restricts the engine's ability to expel exhaust gases, leading to reduced efficiency and performance.

What Scenario Is Indicated by a Loss of More Than