ASE A1 Engine Repair Practice Test
46. After replacing the lower radiator hose and adding coolant, the engine continues to overheat. Which of the following is MOST likely causing this condition?
- A. A faulty water pump impeller.
- B. A leaking head gasket.
- C. A faulty fan motor relay.
- D. An air pocket in the cooling system.
47. A vehicle is emitting black-colored exhaust. Which of these could be the cause?
- A. Oil is burning in the combustion chamber.
- B. Coolant is burning in the combustion chamber.
- C. A rich air-fuel ratio.
- D. A lean air-fuel ratio.
48. All of the following statements are true about an engine's PCV system EXCEPT:
- A. A stuck closed PCV valve results in excessive crankcase pressure.
- B. A stuck open PCV valve results in a rough idle.
- C. Oil leakage indicates a problem with the system.
- D. The PCV valve should not rattle when shaken.
49. A cylinder power balance test indicates two adjacent cylinders are underperforming. Which of the following is causing this test result?
- A. A faulty fuel injector.
- B. A bad exhaust valve.
- C. Worn piston rings.
- D. A leaking head gasket.
50. An engine has excessive crankshaft endplay. Which of the following is MOST likely causing this condition?
- A. Camshaft bearings
- B. Thrust bearings
- C. Crankshaft main bearings
- D. Rod bearings
