ASE Practice Test (A8: Engine
Performance) Exam Questions &
Answers (Grade A+)
The EGR (Exhaust Gas Recirculation) valve may be closed, according
to a technician. A closed EGR valve would be indicated by which of
the following? -
correct answer ✅Spark knock
What is the LEAST likely reason of a gasoline tank leak: -
correct answer ✅defective tank straps.
Blue smoke comes from the exhaust pipe of a vehicle. Technician X
says that blocked cylinder head oil return passages could be the
cause. Technician Y says that a stuck-open engine thermostat could
be the cause. Who is right? -
correct answer ✅X only
What should you do first when diagnosing an engine performance
problem? -
correct answer ✅Discuss the concern with the owner of the
vehicle
The plastic sensors on an electronically controlled EGR valve have
melted. Technician X says excessive back pressure caused by a
partially clogged exhaust system could be the cause. Technician Y
, ASE Practice Test (A8: Engine
Performance) Exam Questions &
Answers (Grade A+)
says to always check for a restricted exhaust whenever replacing a
failed EGR valve sensor. Who is right? -
correct answer ✅Both X and Y
All of these reduce the life of the turbocharger, except: -
correct answer ✅exhaust system damage.
A vehicle is being diagnosed for poor fuel economy. Engine tests
show a rich exhaust gas mixture. Technician X says that a failed
oxygen (O2 ) sensor could be the cause. Technician Y says that a
failed engine coolant temperature sensor could be the cause. Who
is right? -
correct answer ✅Both X and Y
Technician X believes that paper service manuals still get used
today. Technician Y believes that you should always follow
recommended service procedures found in online service
information. Who is correct? -
correct answer ✅Technician Y
A disconnected spark plug is interpreted by the vehicle's OBD II (On
Board Diagnostic Level 2) system as a misfire that could harm the
Performance) Exam Questions &
Answers (Grade A+)
The EGR (Exhaust Gas Recirculation) valve may be closed, according
to a technician. A closed EGR valve would be indicated by which of
the following? -
correct answer ✅Spark knock
What is the LEAST likely reason of a gasoline tank leak: -
correct answer ✅defective tank straps.
Blue smoke comes from the exhaust pipe of a vehicle. Technician X
says that blocked cylinder head oil return passages could be the
cause. Technician Y says that a stuck-open engine thermostat could
be the cause. Who is right? -
correct answer ✅X only
What should you do first when diagnosing an engine performance
problem? -
correct answer ✅Discuss the concern with the owner of the
vehicle
The plastic sensors on an electronically controlled EGR valve have
melted. Technician X says excessive back pressure caused by a
partially clogged exhaust system could be the cause. Technician Y
, ASE Practice Test (A8: Engine
Performance) Exam Questions &
Answers (Grade A+)
says to always check for a restricted exhaust whenever replacing a
failed EGR valve sensor. Who is right? -
correct answer ✅Both X and Y
All of these reduce the life of the turbocharger, except: -
correct answer ✅exhaust system damage.
A vehicle is being diagnosed for poor fuel economy. Engine tests
show a rich exhaust gas mixture. Technician X says that a failed
oxygen (O2 ) sensor could be the cause. Technician Y says that a
failed engine coolant temperature sensor could be the cause. Who
is right? -
correct answer ✅Both X and Y
Technician X believes that paper service manuals still get used
today. Technician Y believes that you should always follow
recommended service procedures found in online service
information. Who is correct? -
correct answer ✅Technician Y
A disconnected spark plug is interpreted by the vehicle's OBD II (On
Board Diagnostic Level 2) system as a misfire that could harm the
