ASE4 Practice Test
Updated October 2026ASE4 Practice Test Questions
Prepare for the ASE4 - ASE Automobile Engine Performance exam with our free practice test modules. Each quiz covers key topics to help you pass on your first try.
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Sample ASE4 - ASE Automobile Engine Performance Practice Questions
Try these questions from our free ASE4 - ASE Automobile Engine Performance practice tests. The correct answer and an explanation follow each question.
An engine has a wet compression test reading significantly higher than the dry test. This indicates:
- A. A blown head gasket
- B. Worn or damaged piston rings
- C. Leaking intake valves
- D. A cracked cylinder head
Answer: B. Worn or damaged piston rings
Adding oil temporarily seals worn rings, causing a wet reading much higher than the dry reading.
When performing a cylinder leakage test, air is heard escaping from the throttle body. This indicates:
- A. A leaking exhaust valve
- B. A leaking intake valve
- C. Worn piston rings
- D. A cracked piston
Answer: B. A leaking intake valve
Air escaping back through the throttle body during a leak-down test indicates a leaking intake valve on that cylinder.
A fuel pressure test shows correct pressure at idle but drops significantly under full throttle acceleration. This indicates:
- A. A restricted fuel filter or weak fuel pump
- B. A leaking fuel pressure regulator
- C. A faulty MAP sensor
- D. Stuck-open fuel injectors
Answer: A. A restricted fuel filter or weak fuel pump
Fuel pressure that drops under high-demand acceleration indicates the pump or filter cannot maintain adequate flow.
A technician performs a fuel injector balance test. One injector causes a smaller pressure drop than the others. This means that injector is:
- A. Flowing too much fuel (stuck open)
- B. Flowing too little fuel (clogged or weak)
- C. Working normally
- D. Leaking when the engine is off
Answer: B. Flowing too little fuel (clogged or weak)
A smaller pressure drop during an injector balance test means the injector delivered less fuel, indicating a restriction or weak coil.
Take the full ASE4 - ASE Automobile Engine Performance practice test
ASE4 Questions and Answers
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