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Question 1
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?
Correct Answer:
A leaking head gasket, burned valve, or worn rings in that cylinder
Question 2
Technician A says a cylinder leakage (leak-down) test pinpoints where compression is escaping. Technician B says air heard at the throttle body or air intake during a leak-down test indicates a leaking intake valve. Who is correct?
Correct Answer:
Both A and B
Question 3
During a running compression test on a gasoline truck engine, the snap-throttle reading is much lower than the cranking compression reading on the same cylinder. This MOST likely indicates:
Correct Answer:
A restricted intake (such as a clogged air filter or carbon buildup)
Question 4
A gasoline-powered medium truck has white smoke from the exhaust, coolant loss with no external leaks, and a sweet smell. The MOST likely cause is:
Correct Answer:
A leaking head gasket or cracked cylinder head allowing coolant into the combustion chamber
Question 5
A truck gasoline engine has a steady knocking noise that increases with load and is loudest at idle when warm. Disabling the suspected cylinder's ignition reduces the noise. This MOST likely indicates:
Correct Answer:
A worn connecting rod bearing in that cylinder
Question 1
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About this Exam

Prepare with the ASE T1 Gasoline Engines (Medium Heavy Truck) Practice Questions - ASE T1 - Gasoline Engines (Medium Heavy Truck) Certification Exam practice quiz. This question bank includes 100 questions covering engine, truck, gasoline, cause, and technician. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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

This practice set contains 100 questions from the matching question bank and focuses on engine, truck, gasoline, cause, and technician. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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