ASE A1 Engine Repair Practice Test

6. Technician A says the valves in many interference engines open further into the combustion chamber that than those of a non-interference engine. Technician B says a broken timing belt in an interference engine can result in damage to the engine's valve train. Who is correct?

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

6.

Answer A is wrong. Both technicians are correct.

Answer B is wrong. Both technicians are correct.

Answer C is correct. The valve can strike the piston when out of time in an interference engine.

Answer D is wrong. Both technicians are correct.

7. The spark plug is removed and shop air is introduced to the #1 cylinder while at TDC. Bubbles are seen in the radiator neck. The MOST likely cause of this condition is:

  • A. A bent intake valve.
  • B. Worn piston rings.
  • C. A burned exhaust valve.
  • D. A leaking head gasket.

7.

Answer A is wrong. A bent intake valve will result in air escaping from the intake manifold.

Answer B is wrong. Worn piston rings result in air escaping from the PCV system.

Answer C is wrong. A bent exhaust valve will result in air escaping from the tailpipe.

Answer D is correct. Air is leaking from the cylinder, past the gasket, and into the coolant jacket. Air bubbles are now seen floating up to the radiator neck

8. A vehicle is emitting black smoke from its tailpipe, has poor fuel mileage and the torque converter is not engaging. Technician A says the ECT sensor's signal will effect TCC application. Technician B says the ECT sensor will affect the engine's fuel mixture. Who is correct?

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

8.

Answer A is wrong. Both technicians are correct. The ECT affects both TCC application and fuel mixture. The torque converter will not engage until the engine reaches a certain operating temperature. There is a one to one connection and no slippage when the torque converter clutch locks the turbine to the converter housing. Without this no slip one to one connection, fuel mileage will suffer.

Answer B is wrong. The Engine Coolant Temperature Sensor’s signal informs the PCM of the engine’s operating temperature. When the engine is cold it enriches the mixture. As the engine warms, the PCM will lean the mixture accordingly. A false signal may result in a rich fuel mixture and black colored exhaust noticed at the tailpipe.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

9. Technician A says a flex fan will increase its pitch at higher engine speeds. Technician B says a viscous fan clutch contains a silicon based fluid and should be checked for leaks. Who is correct?

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

9.

Answer A is wrong. A flex fan decreases its pitch at higher engine speeds.

Answer B is correct. A viscous fan clutch contains a silicon based fluid.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

10. A vehicle has a clogged catalytic converter. The LEAST likely cause of this is:

  • A. A rich fuel condition.
  • B. A leaking fuel injector.
  • C. A cracked intake manifold.
  • D. A fouled spark plug.

10.

Answer A is wrong.

Answer B is wrong.

Answer C is correct. This is a LEAST LIKELY type question. A rich, not lean condition is likely to cause internal damage to a catalytic converter.

Answer D is wrong.