Automotive Engine Performance Final
Exam Actual Questions and Answers
2026
In a GDI system (gasoline direct injection) the injector sprays fuel
into the ______. -
correct answer ✅d.
cylinders (combustion chamber)
Which of the following is NOT an advantage of an electronic spark
control system? -
correct answer ✅b.
It allows lower compression ratio engines to be as efficient as
higher compression ratio engines
Waste spark EI systems are being discussed. Technician A says a
high-resistance spark plug won't affect the firing of its companion
spark plug. Technician B says improper spark plug torque can't
cause an engine misfire. Who is correct? -
correct answer ✅d. neither A nor B
What is an advantage of EI ignition? -
correct answer ✅d. All of the answers are correct.
,Automotive Engine Performance Final
Exam Actual Questions and Answers
2026
Technician A says a plug with a V-notch ground electrode will have
two electric arcs jumping across the spark plug gap each time the
spark plug fires. Technician B says a spark plug gap that is too wide
requires higher voltage to jump the gap, which can cause a misfire.
Who is correct? -
correct answer ✅b. B only
OBD II technology is being discussed. Technician A says the OBD II
system has the ability to store a freeze frame (snapshot) of the
operating conditions that existed when the fault occurred.
Technician B says vehicle identification must be transmitted
automatically to the scan tool. Who is correct? -
correct answer ✅c. Both A and B
A vehicle with a DTC for an engine coolant temperature out of
range code is being tested.The serial data stream shows the coolant
temperature to be 198 degrees Fahrenheit. When the technician
tests the resistance between the ETC terminals, he finds infinite
resistance. The specifications call for 20 to 40 ohms at 200 degrees
Fahrenheit. After the ECT is replaced and the code is erased, the
system runs normally and the code and MIL illumination do not
reoccur. How is this possible? -
correct answer ✅d.
,Automotive Engine Performance Final
Exam Actual Questions and Answers
2026
When the ECT failed, the PCM substituted a nominal ECT value that
allowed the engine to run in limp home mode; the substituted
value was displayed by the scan tool
Two technicians are discussing OBD-II monitor readiness status.
Technician A says that the vehicle must be driven through a drive
cycle that includes several minutes of idle, low-speed cruise,
medium-speed cruise, and deceleration before all monitors can be
performed. Technician B says all monitors can be performed in five
minutes of fast idling. Who is correct? -
correct answer ✅a. A only
The two types of ignition systems are EI (electronic ignition) and
______. -
correct answer ✅b. DI (distributor ignition)
Two technicians are discussing testing switch type sensors.
Technician A uses an ohmmeter. Technician B uses a voltmeter.
Who is correct? -
correct answer ✅c. both A and B
, Automotive Engine Performance Final
Exam Actual Questions and Answers
2026
In EI systems using one ignition coil for every two cylinders,
Technician A says two plugs fire at the same time, with one wasting
the spark on the exhaust stroke. Technician B says one plug fires in
the normal direction and the other in reversed polarity. Who is
correct? -
correct answer ✅c. both A and B
A vehicle towed into the shop will crank but won't start. A quick
check under the hood reveals that the spark plugs are not firing and
the injectors are not receiving a pulse from the PCM. The technician
notices that the MIL light does not come on when the key is turned
to the run position. What should he do next? -
correct answer ✅a.
Check the PCM's fuses, power wires, and ground wires
Ignition timing is being discussed. Technician A says when the
engine idle speed moves away from the desired idle speed, the
PCM will adjust the timing to stabilize the engine speed. Technician
B says when a knock is detected, the PCM retards the timing in
fixed steps until the knock disappears. Who is correct? -
correct answer ✅c. both A and B
Exam Actual Questions and Answers
2026
In a GDI system (gasoline direct injection) the injector sprays fuel
into the ______. -
correct answer ✅d.
cylinders (combustion chamber)
Which of the following is NOT an advantage of an electronic spark
control system? -
correct answer ✅b.
It allows lower compression ratio engines to be as efficient as
higher compression ratio engines
Waste spark EI systems are being discussed. Technician A says a
high-resistance spark plug won't affect the firing of its companion
spark plug. Technician B says improper spark plug torque can't
cause an engine misfire. Who is correct? -
correct answer ✅d. neither A nor B
What is an advantage of EI ignition? -
correct answer ✅d. All of the answers are correct.
,Automotive Engine Performance Final
Exam Actual Questions and Answers
2026
Technician A says a plug with a V-notch ground electrode will have
two electric arcs jumping across the spark plug gap each time the
spark plug fires. Technician B says a spark plug gap that is too wide
requires higher voltage to jump the gap, which can cause a misfire.
Who is correct? -
correct answer ✅b. B only
OBD II technology is being discussed. Technician A says the OBD II
system has the ability to store a freeze frame (snapshot) of the
operating conditions that existed when the fault occurred.
Technician B says vehicle identification must be transmitted
automatically to the scan tool. Who is correct? -
correct answer ✅c. Both A and B
A vehicle with a DTC for an engine coolant temperature out of
range code is being tested.The serial data stream shows the coolant
temperature to be 198 degrees Fahrenheit. When the technician
tests the resistance between the ETC terminals, he finds infinite
resistance. The specifications call for 20 to 40 ohms at 200 degrees
Fahrenheit. After the ECT is replaced and the code is erased, the
system runs normally and the code and MIL illumination do not
reoccur. How is this possible? -
correct answer ✅d.
,Automotive Engine Performance Final
Exam Actual Questions and Answers
2026
When the ECT failed, the PCM substituted a nominal ECT value that
allowed the engine to run in limp home mode; the substituted
value was displayed by the scan tool
Two technicians are discussing OBD-II monitor readiness status.
Technician A says that the vehicle must be driven through a drive
cycle that includes several minutes of idle, low-speed cruise,
medium-speed cruise, and deceleration before all monitors can be
performed. Technician B says all monitors can be performed in five
minutes of fast idling. Who is correct? -
correct answer ✅a. A only
The two types of ignition systems are EI (electronic ignition) and
______. -
correct answer ✅b. DI (distributor ignition)
Two technicians are discussing testing switch type sensors.
Technician A uses an ohmmeter. Technician B uses a voltmeter.
Who is correct? -
correct answer ✅c. both A and B
, Automotive Engine Performance Final
Exam Actual Questions and Answers
2026
In EI systems using one ignition coil for every two cylinders,
Technician A says two plugs fire at the same time, with one wasting
the spark on the exhaust stroke. Technician B says one plug fires in
the normal direction and the other in reversed polarity. Who is
correct? -
correct answer ✅c. both A and B
A vehicle towed into the shop will crank but won't start. A quick
check under the hood reveals that the spark plugs are not firing and
the injectors are not receiving a pulse from the PCM. The technician
notices that the MIL light does not come on when the key is turned
to the run position. What should he do next? -
correct answer ✅a.
Check the PCM's fuses, power wires, and ground wires
Ignition timing is being discussed. Technician A says when the
engine idle speed moves away from the desired idle speed, the
PCM will adjust the timing to stabilize the engine speed. Technician
B says when a knock is detected, the PCM retards the timing in
fixed steps until the knock disappears. Who is correct? -
correct answer ✅c. both A and B
