| Free A.S.E. Study Guide An ASE Study Guide for the Automotive Technician |
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| A-8 Engine Performance Practice Test |
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11. Technician A says the PCM will
advance the ignition timing when it
receives a voltage signal from the
knock sensor. Technician B says this
sensor sends an A/C signal to the
PCM when it detects ping or spark
knock. Who is correct?
advance the ignition timing when it
receives a voltage signal from the
knock sensor. Technician B says this
sensor sends an A/C signal to the
PCM when it detects ping or spark
knock. Who is correct?
12. Two technicians are discussing a
turbo charger. Technician A says the
wastegate is used to control boost
pressure. Technician B says PCM
controlled systems use the MAP
(manifold absolute pressure ) sensor
input to cut fuel injectors when
pressure exceeds specifications.
Who is correct?
turbo charger. Technician A says the
wastegate is used to control boost
pressure. Technician B says PCM
controlled systems use the MAP
(manifold absolute pressure ) sensor
input to cut fuel injectors when
pressure exceeds specifications.
Who is correct?
13. A vehicle has a momentary
hesitation only during acceleration.
The most likely cause of this
condition is a:
hesitation only during acceleration.
The most likely cause of this
condition is a:
14. Technician A says a five gas
analyzer is capable of checking a
vehicles emissions for oxygen.
Technician B says a four gas analyzer
is capable of checking a vehicles
emissions for oxides of nitrogen.
Who is correct?
analyzer is capable of checking a
vehicles emissions for oxygen.
Technician B says a four gas analyzer
is capable of checking a vehicles
emissions for oxides of nitrogen.
Who is correct?
15. A vehicle is blowing blue/gray
smoke from its tailpipe. Technician A
says this is caused by coolant
burning in the combustion chamber.
Technician B says this is caused by
oil burning in the combustion
chamber. Who is correct?
smoke from its tailpipe. Technician A
says this is caused by coolant
burning in the combustion chamber.
Technician B says this is caused by
oil burning in the combustion
chamber. Who is correct?
16. A PCM uses all of these sensors
to calculate engine idle except.
to calculate engine idle except.
17. A vehicle is backfiring and has a
lack of power. Technician A says it
may be the catalytic converter and a
backpressure test should be
performed. Technician B says a
vacuum gauge can also be used to
diagnose a catalytic converter.
Who is correct?
lack of power. Technician A says it
may be the catalytic converter and a
backpressure test should be
performed. Technician B says a
vacuum gauge can also be used to
diagnose a catalytic converter.
Who is correct?
18. Two technicians are discussing
code P0171. Technician A says the P
in the code stands for powertrain.
Technician B says the 0 in the code
means it is manufacturer specific.
Who is correct?
code P0171. Technician A says the P
in the code stands for powertrain.
Technician B says the 0 in the code
means it is manufacturer specific.
Who is correct?
19. Technician A says when the
vacuum hose is disconnected from a
vacuum operated fuel pressure
regulator the fuel pressure should
incease. Technician B says a
restricted fuel return line can cause a
vehicle to run lean. Who is correct?
vacuum hose is disconnected from a
vacuum operated fuel pressure
regulator the fuel pressure should
incease. Technician B says a
restricted fuel return line can cause a
vehicle to run lean. Who is correct?
20. Technician A says the camshaft
position sensor signals the PCM
when the camshaft is at TDC on the
compression stroke. Technician B
says on the pick up coil type sensors
the distance between the sensor and
the ring is critical. Who is correct?
position sensor signals the PCM
when the camshaft is at TDC on the
compression stroke. Technician B
says on the pick up coil type sensors
the distance between the sensor and
the ring is critical. Who is correct?
