ASE A8 Practice Test - ASE A8 Engine
Performance Test Prep - Test 1 Exam
Actual Questions and Answers 2026
Technician A says the PCM will advance the engine's ignition timing
when it receives a voltage signal from the knock sensor. Technician
B says this sensor sends an AC signal to the PCM when it detects
ping or denotation. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A nor B -
correct answer ✅Technician B
The waveforms below are compared to diagnose catalytic converter
efficiency. Technician A says Bank 1 Sensor 2 is faulty because the
two waveforms should have similar voltage peaks and fluctuations.
Technician B says Bank 1 Sensor 2 monitors the catalytic converter's
ability to reduce pollutants in the exhaust stream. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A nor B -
correct answer ✅Technician B
, ASE A8 Practice Test - ASE A8 Engine
Performance Test Prep - Test 1 Exam
Actual Questions and Answers 2026
An engine with variable valve timing has a rough idle but runs
smoothly at higher engine speeds. Technician A says to check the
variable valve timing solenoid and its associated circuit. Technician
B says this problem could be caused by unchanged contaminated
oil. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A nor B -
correct answer ✅Both A and B
Technician A says an AF (Air/Fuel) sensor reaches and keeps an
engine at stoichiometry. Technician B says stoichiometry is a 16.7:1
air-fuel ratio. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A nor B -
correct answer ✅Technician A
Performance Test Prep - Test 1 Exam
Actual Questions and Answers 2026
Technician A says the PCM will advance the engine's ignition timing
when it receives a voltage signal from the knock sensor. Technician
B says this sensor sends an AC signal to the PCM when it detects
ping or denotation. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A nor B -
correct answer ✅Technician B
The waveforms below are compared to diagnose catalytic converter
efficiency. Technician A says Bank 1 Sensor 2 is faulty because the
two waveforms should have similar voltage peaks and fluctuations.
Technician B says Bank 1 Sensor 2 monitors the catalytic converter's
ability to reduce pollutants in the exhaust stream. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A nor B -
correct answer ✅Technician B
, ASE A8 Practice Test - ASE A8 Engine
Performance Test Prep - Test 1 Exam
Actual Questions and Answers 2026
An engine with variable valve timing has a rough idle but runs
smoothly at higher engine speeds. Technician A says to check the
variable valve timing solenoid and its associated circuit. Technician
B says this problem could be caused by unchanged contaminated
oil. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A nor B -
correct answer ✅Both A and B
Technician A says an AF (Air/Fuel) sensor reaches and keeps an
engine at stoichiometry. Technician B says stoichiometry is a 16.7:1
air-fuel ratio. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A nor B -
correct answer ✅Technician A
