ASE A1 Engine Repair Practice Test

11. After diagnosing and replacing the cooling system's water pump, the vehicle's engine continues to overheat. Which of the following is MOST likely causing this overheating?

  • A. An air pocket in the system.
  • B. Leaking head gasket.
  • C. Faulty replacement water pump.
  • D. The radiator.

11.

Answer A is correct. Air pockets form after draining the engine's coolant. Some vehicles are more prone to this problem than others.

Answer B is wrong. A leaking head gasket would result in gases escaping the seal and coolant leaking into the combustion chamber. It would likely emit white smoke from its tailpipe as the coolant burns white.

Answer C is wrong. A faulty replacement water pump is not the most likely answer.

Answer D is wrong. Answer A is correct.

12. Technician A says sealants such as RTV are anaerobic and cure in the absence of air. Technician B says using an unapproved sealant can damage some sensors. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

12.

Answer A is wrong. RTV (Room Temperature Vulcanizing) is an aerobic sealant meaning that it cures in the presence of air.

Answer B is correct. Keep RTV away from sensors. Don't use RTV sealant on high-temperature components like oxygen sensors and exhaust manifolds.

Answer C is wrong. Anaerobic sealers are used on smooth, machined components and dry in the absence of air.

Answer D is wrong. Technician B is correct.

13. An engine has a noise that goes away as it warms and reaches operating temperature. Which of these is the MOST likely cause?

  • A. Loose main bolt.
  • B. Loose connecting rod bolt.
  • C. Piston to wall clearance.
  • D. Loose intake manifold.

13.

Answer A is wrong. A loose main bolt is not likely to go away as the engine reaches operating temperature.

Answer B is wrong. A spun connecting rod bearing is not likely to go away as the engine reaches operating temperature.

Answer C is correct. As the piston expands, the clearance between it and the cylinder wall decreases, and so does the noise known as piston slap.

Answer D is wrong. A loose intake manifold will cause low vacuum.

14. An engine suffers from detonation. Technician A this may be caused by a defective EGR valve. Technician B says advanced ignition timing can cause this condition. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

14.

Answer A is wrong. A stuck closed EGR valve will cause ping (detonation) while a stuck open valve will cause an engine to stumble and stall.

Answer B is wrong. There are several causes for these conditions. Most have to do with temperature and timing.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

15. Technician A says faulty turbocharger bearings will result in a loss of engine oil. Technician B says a dirty turbocharger air filter will result in a loss of engine oil. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

15.

Answer A is correct. Faulty turbocharger bearings will result in oil seal failure.

Answer B is wrong. A dirty turbocharger air filter can result in blade damage.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.