ASE ENGINE PERFORMANCE EXAM
QUESTIONS AND ANSWERS
An EFI engine is running rough
and stalling at idle. The MAP
sensor's vacuum hose is loose and
cracking. Technician A says this
sensor measures air mass to
establish the base pulse of the
engine's fuel injectors. Technician B
says this sensor measures changes
in intake manifold pressure.
Replacing this hose will restore its
path to manifold pressure. Who is
correct?
A: Tech A
B: Tech B
C: Both A and B
D: Neither A or B -
correct answer ✅B: Tech B
A vehicle has a momentary
,ASE ENGINE PERFORMANCE EXAM
QUESTIONS AND ANSWERS
hesitation only during acceleration.
The MOST likely cause of this
condition is:
A: A faulty exhaust gas
recirculating valve. (EGR)
B: A faulty oxygen sensor.
(02) sensor
C: A faulty positive
crankcase ventilation valve.
(PCV)
D: A faulty throttle position
sensor. (TPI) -
correct answer ✅D: A faulty throttle position
sensor. (TPI)
A four cylinder EFl engine has an
engine code indicating insufficient
EGR flow. The EGR solenoid has
been tested and found to be faulty.
, ASE ENGINE PERFORMANCE EXAM
QUESTIONS AND ANSWERS
This faulty solenoid will result in
which of these conditions?
A: High CO emissions.
B: High HC emissions.
C: High CO2 emissions.
D: High NOx emissions. -
correct answer ✅D: High NOx emissions.
A vehicle with an enhanced
EVAP system is scanned and a
code indicating a small evaporative
emissions leak is detected. A loose
or cracked gas cap is suspected.
Technician A says the cap contains
a vacuum and pressure relief valve,
a small crack in the cap will not
illuminate the check engine light.
Technician B says the tank contains
a sensor. The PCM will sense low
QUESTIONS AND ANSWERS
An EFI engine is running rough
and stalling at idle. The MAP
sensor's vacuum hose is loose and
cracking. Technician A says this
sensor measures air mass to
establish the base pulse of the
engine's fuel injectors. Technician B
says this sensor measures changes
in intake manifold pressure.
Replacing this hose will restore its
path to manifold pressure. Who is
correct?
A: Tech A
B: Tech B
C: Both A and B
D: Neither A or B -
correct answer ✅B: Tech B
A vehicle has a momentary
,ASE ENGINE PERFORMANCE EXAM
QUESTIONS AND ANSWERS
hesitation only during acceleration.
The MOST likely cause of this
condition is:
A: A faulty exhaust gas
recirculating valve. (EGR)
B: A faulty oxygen sensor.
(02) sensor
C: A faulty positive
crankcase ventilation valve.
(PCV)
D: A faulty throttle position
sensor. (TPI) -
correct answer ✅D: A faulty throttle position
sensor. (TPI)
A four cylinder EFl engine has an
engine code indicating insufficient
EGR flow. The EGR solenoid has
been tested and found to be faulty.
, ASE ENGINE PERFORMANCE EXAM
QUESTIONS AND ANSWERS
This faulty solenoid will result in
which of these conditions?
A: High CO emissions.
B: High HC emissions.
C: High CO2 emissions.
D: High NOx emissions. -
correct answer ✅D: High NOx emissions.
A vehicle with an enhanced
EVAP system is scanned and a
code indicating a small evaporative
emissions leak is detected. A loose
or cracked gas cap is suspected.
Technician A says the cap contains
a vacuum and pressure relief valve,
a small crack in the cap will not
illuminate the check engine light.
Technician B says the tank contains
a sensor. The PCM will sense low
