A recently rebuilt engine has several burned pistons. Technician A says that pistons can burn or seize in the cylinder due to an intake manifold air leak. Technician B says that too rich an air-fuel mixture is a likely cause of this problem. Who is right?
A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because an intake manifold air leak can cause a lean air-fuel mixture, leading to higher combustion temperatures and potentially burning or seizing pistons. Technician B is incorrect because a too rich mixture tends to cool the combustion, reducing the likelihood of burning pistons.

A Recently Rebuilt Engine Has Several Burned Pistons