ASE A1 Engine Repair Practice Test

6. Technician A says to use a machinist rule to measure valve tip installed height. Technician B says to use an outside micrometer to measure valve spring squareness. Who is correct?

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

6.

Answer A is correct. Use a machinist rule to measure valve tip installed height.

Answer B is wrong. Use a square and a feeler gauge to check valve spring squareness.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Use a machinist rule to measure valve spring installed height.

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7. Technician A says oil viscosity changes with engine temperature. Technician B says a faulty oil cooler could result in a coolant leak. Who is correct?

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

7.

Answer A is wrong. Both technicians are correct.

Answer B is wrong. Oil coolers can leak coolant or oil. Inspect the gasket and oil cooler o-ring for leaks.

Answer C is correct. When the engine is running hot, the oil is also running hot—too much heat results in thermal breakdown.

Answer D is wrong. Both technicians are correct.

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8. A FWD vehicle's steering wheel and dashboard vibrate when the brake pedal is applied, and the transmission is placed into gear. The MOST likely cause of this vibration is:

  • A. A clogged catalytic converter.
  • B. A faulty fuel injector.
  • C. A faulty axle CV-joint.
  • D. A broken engine mount.

8.

Answer A is wrong. A clogged catalytic converter causes a restriction that results in a noticeable drop in power during acceleration.

Answer B is wrong. A clogged or faulty fuel injector will result in poor engine performance and misfire.

Answer C is wrong. A faulty outer CV-Joint makes a clicking or popping noise while slowly turning corners.

Answer D is correct. A worn or broken engine or transmission mount results in a noticeable vibration with the brake applied and the transmission placed into gear.

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9. A turbocharged engine is misfiring, and the check engine light is illuminated. A scan for fault codes indicates code P0234 (an overboost condition). Which of the following could be the cause?

  • A. A stuck open wastegate.
  • B. An intake manifold vacuum leak.
  • C. A stuck closed wastegate.
  • D. Leaking turbocharger oil seals.

9.

Answer A is wrong. The turbocharger wastegate controls the turbocharger's output. It opens to divert exhaust from the turbine wheel, depriving it of pressure.

Answer B is wrong. A vacuum leak in the intake manifold results in a lean air-fuel ratio.

Answer C is correct. A faulty boost sensor, a stuck closed wastegate, or a defective control valve solenoid cause excessive boost pressure. Without this necessary reduction in output, excessive manifold and cylinder pressures could damage vital engine components.

Answer D is wrong. Leaking turbocharger oil seals cause excessive oil consumption and blue-gray exhaust.

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10. Technician A says worn valve guides result in excessive oil consumption. Technician B says aluminum heads have valve guide inserts. Who is correct?

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

10.

Answer A is wrong. Valve guides are small holes machined into a cylinder head that allow the intake and exhaust valves to move up and down. A misaligned valve or a faulty valve seat seal results in valve overheating.

Answer B is wrong. The valve guides in iron cylinder heads are machined directly into the head. Aluminum heads have valve guide inserts. The inserts are press-fit into slightly smaller holes. They use inserts because aluminum will wear and is not as strong as iron.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

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