ASE A8 Engine Performance Practice Test
31. After performing a wet compression test, the pressure in each cylinder has increased but remains below specifications. Technician A says the engine has incorrect valve timing. Technician B says worn piston rings have caused these results. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
32. A vacuum gauge is connected to a port on the intake manifold of an engine with poor performance. The needle on the gauge fluctuates between 15 "hg and 20 "hg vacuum at idle. This vacuum gauge reading indicates:
- A. A normal condition.
- B. Late ignition or valve timing.
- C. A burned exhaust valve.
- D. A restricted exhaust.
33. Technician A says a stuck closed (EGR) exhaust gas recirculating valve causes an engine to stumble or stall. Technician B says a stuck open EGR valve results in detonation. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
34. A vehicle is emitting black smoke from its tailpipe at idle. Which of these could be the cause?
- A. A leaking fuel injector.
- B. Worn piston rings.
- C. A blown head gasket.
- D. Leaking valve seals.
35. A vehicle with an enhanced EVAP system has a code indicating that a small evaporative emissions leak has been detected. Technician A says a small crack in the gas cap will result in this code. Technician B says this system contains a sensor that senses low tank pressure. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
