ASE-A8 Engine performance Exam
Questions & Answers (Grade A+)
1. What does a wet compression test, test for? -
correct answer ✅Burned valve would show no change in
compression.
A leaking/worn piston would have some change in compression.
What most likely is the cause if the compression doesn't go up
during a wet compression test?
A, burnt valve.
B, worn piston ring. -
correct answer ✅A
What most likely is the cause if the compression goes up during a
wet compression test?
A, burnt valve.
B, worn piston ring. -
correct answer ✅B
2. Blue smoke is coming from the exhaust pipe of a vehicle, what
most likely is the cause?
A, worn piston ring.
,ASE-A8 Engine performance Exam
Questions & Answers (Grade A+)
B, bad head gasket. -
correct answer ✅A
3. A vacuum guage is connected to the intake manifold of an engine
and the engine is run at 2000 rpm. During the test, the pointer on
the guage fluctuates rapidly between readings of 10 and 20 inches
of vacuum. These test results point to:
A, a leaking intake manifold.
B, worn piston rings.
C, worn valve guides.
D, a week or broken valve spring. -
correct answer ✅D, a weak or broken valve spring would cause a
vacuum guage to fluctuate or jump from high to low readings.
4. Engine detonation (knock) could be caused by any of the
following Except:
A. a lean air/fuel mixture
B. retarded ignition timing
C. excess carbon in the the combustion chambers
,ASE-A8 Engine performance Exam
Questions & Answers (Grade A+)
D. a stuck-closed EGR valve -
correct answer ✅B. Advanced ignition timing will cause a knock,
but retarded timing will not.
5. A vehicle with electronic ignition hesitates and stumbles during
acceleration. The problem goes away when the vacuum advance
hose is disconnected and plugged. Technician A says that a stuck
vacuum advance mechanism could be the cause. Technician B says
that an intermittent open in the pickup coil leads could be the
cause. Who is right?
A. Technician A only
B. Technician B only
C. Both A and b
D. Neither A or B -
correct answer ✅B. If a vacuum advance mechanism were stuck,
the problem would not change if the vacuum hose is connected or
disconnected. When the vacuum changes to the vacuum advance
mechanism and the distributor plate moves, this may move the
wires to the pick-up causing a short or open which would cause the
pick-up signal to be lost momentarily.
, ASE-A8 Engine performance Exam
Questions & Answers (Grade A+)
6. Technician A says that spark advance on and engine can be
tested by listening to the way the engine sounds at higher rpms.
Technician B says that spark advance on an engine can be tested
with a timing light that incorporates an ignition advance meter.
Who is right.
A. Technician A only
B. Technician B only
C. Both A and B
D. Nether A or B -
correct answer ✅B. to accurately measure spark advance use a
timing light. The spark advance cannon be determined by listening
to the way the engine sounds.
7. A regular customer presents his vehicle for service. He describes
symptoms of poor drive ability and says that the vehicle has been
repaired for the same problem in the past. Which of the following
you should do first?
A. connect the vehicle to an engine analyzer
B. check for diagnostic trouble codes.
C. check the vehicle service history and check for TSBs, service
campaigns and recalls
Questions & Answers (Grade A+)
1. What does a wet compression test, test for? -
correct answer ✅Burned valve would show no change in
compression.
A leaking/worn piston would have some change in compression.
What most likely is the cause if the compression doesn't go up
during a wet compression test?
A, burnt valve.
B, worn piston ring. -
correct answer ✅A
What most likely is the cause if the compression goes up during a
wet compression test?
A, burnt valve.
B, worn piston ring. -
correct answer ✅B
2. Blue smoke is coming from the exhaust pipe of a vehicle, what
most likely is the cause?
A, worn piston ring.
,ASE-A8 Engine performance Exam
Questions & Answers (Grade A+)
B, bad head gasket. -
correct answer ✅A
3. A vacuum guage is connected to the intake manifold of an engine
and the engine is run at 2000 rpm. During the test, the pointer on
the guage fluctuates rapidly between readings of 10 and 20 inches
of vacuum. These test results point to:
A, a leaking intake manifold.
B, worn piston rings.
C, worn valve guides.
D, a week or broken valve spring. -
correct answer ✅D, a weak or broken valve spring would cause a
vacuum guage to fluctuate or jump from high to low readings.
4. Engine detonation (knock) could be caused by any of the
following Except:
A. a lean air/fuel mixture
B. retarded ignition timing
C. excess carbon in the the combustion chambers
,ASE-A8 Engine performance Exam
Questions & Answers (Grade A+)
D. a stuck-closed EGR valve -
correct answer ✅B. Advanced ignition timing will cause a knock,
but retarded timing will not.
5. A vehicle with electronic ignition hesitates and stumbles during
acceleration. The problem goes away when the vacuum advance
hose is disconnected and plugged. Technician A says that a stuck
vacuum advance mechanism could be the cause. Technician B says
that an intermittent open in the pickup coil leads could be the
cause. Who is right?
A. Technician A only
B. Technician B only
C. Both A and b
D. Neither A or B -
correct answer ✅B. If a vacuum advance mechanism were stuck,
the problem would not change if the vacuum hose is connected or
disconnected. When the vacuum changes to the vacuum advance
mechanism and the distributor plate moves, this may move the
wires to the pick-up causing a short or open which would cause the
pick-up signal to be lost momentarily.
, ASE-A8 Engine performance Exam
Questions & Answers (Grade A+)
6. Technician A says that spark advance on and engine can be
tested by listening to the way the engine sounds at higher rpms.
Technician B says that spark advance on an engine can be tested
with a timing light that incorporates an ignition advance meter.
Who is right.
A. Technician A only
B. Technician B only
C. Both A and B
D. Nether A or B -
correct answer ✅B. to accurately measure spark advance use a
timing light. The spark advance cannon be determined by listening
to the way the engine sounds.
7. A regular customer presents his vehicle for service. He describes
symptoms of poor drive ability and says that the vehicle has been
repaired for the same problem in the past. Which of the following
you should do first?
A. connect the vehicle to an engine analyzer
B. check for diagnostic trouble codes.
C. check the vehicle service history and check for TSBs, service
campaigns and recalls
