| A-8 Engine Performance Certification Practice Test Answers |
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| 16.
Answer A is wrong. A stuck open PCV valve will cause a lean condition, the PCM will adjust the fuel trim accordingly. Answer B is wrong. The PCV system cleans the crankcase from blow-by passing the piston rings and allows it to flow back into the intake for re-combustion. Answer C is correct. Both technicians are correct. Answer D is wrong. Both technicians are correct. Return Learn more the positive crankcase ventilation. |
| 17.
Answer A is correct. The crankshaft position sensor monitors the crankshafts speed and rotation. Answer B is wrong. A PM sensor has two wires and a hall-effect sensor has three. Answer C is wrong. Technician A is correct. Answer D is wrong. Technician A is correct. Return Learn more about crankshaft position sensors. |
| 18.
Answer A is wrong. The evaporative purge valve opens to allow fuel vapors to pass through the evaporative canister to the intake manifold for combustion. Answer B is wrong. An evaporative pressure sensor is used to notify the PCM of gas tank pressure. Answer C is correct. Both technicians are correct. Answer D is wrong. Both technicians are correct. Return Learn more about evaporative emissions and the EVAP system. |
| 19.
Answer A is wrong. This is not considered normal, especially with a four cylinder engine. The engine should begin to stumble and loose its balance from the loss of the cylinders power contribution. Answer B is correct. A significant drop in RPM should be noticed. Answer C is wrong. A significant drop in RPM should be noticed. Answer D is wrong. An engine cylinder power balance test indicates the power of each cylinder testing its effectiveness compared to the others. Return Learn more about the engine cylinder power balance test. |
| 20.
Answer A is wrong. To check for a burned exhaust valve inject some oil in the cylinder and test again. If the pressure increases it is because the oil has improved the seal between the piston rings and the cylinder. If it doesn't increase the valve is most likely the problem. Answer B is wrong. A technician will know if it has faulty piston rings if the compression increases after injecting oil. Answer C is correct. When there are low compression pressures in adjacent cylinders the head gasket is likely leaking compression between the two. Answer D is wrong. Improper valve timing would not result in this condition. Return |
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