ASE T1 Gasoline Engines (Medium Heavy Truck) Practice Questions - ASE T1 - Gasoline Engines (Medium Heavy Truck) Certification Exam

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A medium-duty truck with a large-displacement gasoline engine has a rough idle and low power. A cylinder compression test shows one cylinder reading 90 psi while the others read about 155 psi. Which of the following is the MOST likely cause of the low reading?

A leaking head gasket, burned valve, or worn rings in that cylinder A restricted exhaust system affecting all cylinders equally A weak battery causing slow cranking A clogged fuel injector on that cylinder

Correct Answer:

A leaking head gasket, burned valve, or worn rings in that cylinder

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