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

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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:

A stuck-open thermostat Excessive ignition timing advance A restricted intake (such as a clogged air filter or carbon buildup) Worn piston rings only

Correct Answer:

A restricted intake (such as a clogged air filter or carbon buildup)

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