| A-8 Engine Performance Certification Practice Test | |
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1. Which of these is least-likely to cause a rich fuel condition: A Leaking Fuel Injector B Fuel Pressure Regulator C Engine Coolant Temperature Sensor D Stuck Closed Thermostat |
6. Technician A says a stuck open PCV valve will cause a lean condition. Technician B says the PCV system removes blowby gases from the crankcase. Who is Correct? A Technician A B Technician B C Both Technician A and B D Neither Technician A or B |
2. Technician A says the heater circuit in an oxygen sensor is designed to bring the sensor to operating temperature sooner. Technician B says the oxygen sensor senses oxygen in the exhaust when in closed loop. A Technician A B Technician B C Both Technician A and B D Neither Technician A or B |
7. Technician A says the crankshaft position sensor monitors the crankshafts speed and rotation. Technician B says a permanent magnet sensor has three wires. Who is correct? A Technician A B Technician B C Both Technician A and B D Neither Technician A or B |
3. Technician A says a stuck closed EGR (exhaust gas recirculating) valve will cause an engine to stumble or stall. Technician B says a stuck open EGR valve will cause an engine to ping. A Technician A B Technicain B C Both Technician A and B D Neither Technician A or B |
8. Technician A says that the evaporative purge valve directs fuel vapors into the intake manifold for combustion. Technician B says an evaporative pressure sensor is used to notify the PCM of gas tank pressure. Who is correct? A Technician A B Technician B C Both Technician A and B D Neither Technician A or B |
4. Technician A says the MAP (manifold absolute pressure) sensor senses pressure in the intake manifold. Technician B says the MAF (mass air flow) sensor senses air volume in the air tube to indicate engine load to the PCM. Who is correct? A Technician A B Technician B C Both Technician A and B D Neither Technician A or B |
9. There is black smoke coming from the tailpipe of a vehicle. The most likely to cause this condition is: A A leaking fuel injector. B Worn piston rings. C A blown head gasket. D Leaking valve seals. |
5. Technician A says an AF (Air/Fuel) Sensor is designed to reach and keep a vehicle at Stoichiometry. Technician B says Stoichiometry is 15.7:1 air to fuel mixture. Who is correct? A Technician A B Technician B C Both Technician A and B D Neither Technician A or B |
10. An oxygen sensor has a voltage reading of .20 volts. Technician A says this indicates a rich fuel mixture. Technician B says .45 is 14.7:1 or Stoichiometry. A Technician A B Technician B C Both Technician A and B D Neither Technician A or B |
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