Question

A says an exhaust manifold heat control valve stuck in the closed position causes a loss of engine power.

B says an exhaust manifold heat control valve stuck in open position may cause an acceleration stumble

-A
-B
-Both
-Neither

Answer 1

A stuck closed exhaust manifold heat control valve causes loss of engine power, while a stuck open valve may cause an acceleration stumble.

Step-by-step explanation:

An exhaust manifold heat control valve stuck in the closed position causes a loss of engine power. The closed position restricts the flow of exhaust gases, leading to decreased power output from the engine. On the other hand, an exhaust manifold heat control valve stuck in the open position may cause an acceleration stumble.

When the valve is open, excessive exhaust gas flow can disrupt the air-fuel mixture, resulting in a hesitation or stumble during acceleration.