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. An engine has poor performance. A vacuum gauge is connected to an intake manifold port. 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 emits 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 has a fault code indicating 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