ASE-A8 ENGINE PERFORMANCE 2025/26
QUESTIONS WITH COMPLETE SOLUTIONS.
1 of 85
Term
Technician A says a high spike line on an oscilloscope indicates a
disconnected or open plug wire. Technician B says a high spike line on an
oscilloscope indicates a closed gap on a spark plug. Who is right?
Technician A only
Technician B only
Both A and B
Neither A or B
Give this one a try later!
, C. Both Technicians
C. Air blowing into crankcase indicates worn rings, a piston, or a cylinder.
a blown head gasket would cause air to come out of the radiator with
would indicate a blown head gasket, or a cracked cylinder head or
block.
A. If a spark plug gap were closed, the oscilloscope would indicate a very
low spike line.
B. to accurately measure spark advance use a timing light. The spark advance
cannon be determined by listening to the way the engine sounds.
Don't know?
2 of 85
Term
31. Technician A says that an incorrect ignition pick-up coil
gap can cause a misfire. Technician B says that when testing the pick-
up coil with an ohmmeter, the meter should read infinity when the
ohmmeter is connected to both pick-up coil leads. Who is right?
Give this one a try later!
B. A
B D
, Don't know?
3 of 85
Term
52. when retrieving stood codes from a computerized engine
control system, a hard fault is found regarding a fuel injector circuit.
Tech A says that fuel pressure and volume tests should be
performed. Tech B says that the injectors should be replaced on
that circuit. Who is right?
A. Tech A only
B. Tech B only
C. Both A and B
D.Neither A or B
Give this one a try later!
D. Neither. The secondary air injection system injects air into the exhaust system.
It doesn't not reduce spark knock since the secondary air injection system is
used after the combustion event.
D. The PCM/ECM opens the canister purge valve to cause a vacuum in the Evap
system. All other options are leaks that would prevent a vacuum from being
created.
D. Tech A is wrong because fuel pressure wouldn't throw a injector
circuit code. Tech B is jumping to conclusions and should test the
injector circuit first.
, C. With the piston at TDC on the exhaust stroke, both valves should open
slightly because of valve overlap.. The exhaust valve should close a few
degrees after TDC and the intake valve should open a few degrees before.
Don't know?
4 of 85
Term
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.
Give this one a try later!
C. overcharging is indicated by
short light bulb life C
B A
Don't know?
5 of 85
Term
72. A vehicle with multiport fuel injection has a stalling
problem . When the throttle body is inspected it is found to be
contaminated with sludge buildup . Tech- nician A says that this
could be caused by worn rings . Technician B says that this could
be caused by a
QUESTIONS WITH COMPLETE SOLUTIONS.
1 of 85
Term
Technician A says a high spike line on an oscilloscope indicates a
disconnected or open plug wire. Technician B says a high spike line on an
oscilloscope indicates a closed gap on a spark plug. Who is right?
Technician A only
Technician B only
Both A and B
Neither A or B
Give this one a try later!
, C. Both Technicians
C. Air blowing into crankcase indicates worn rings, a piston, or a cylinder.
a blown head gasket would cause air to come out of the radiator with
would indicate a blown head gasket, or a cracked cylinder head or
block.
A. If a spark plug gap were closed, the oscilloscope would indicate a very
low spike line.
B. to accurately measure spark advance use a timing light. The spark advance
cannon be determined by listening to the way the engine sounds.
Don't know?
2 of 85
Term
31. Technician A says that an incorrect ignition pick-up coil
gap can cause a misfire. Technician B says that when testing the pick-
up coil with an ohmmeter, the meter should read infinity when the
ohmmeter is connected to both pick-up coil leads. Who is right?
Give this one a try later!
B. A
B D
, Don't know?
3 of 85
Term
52. when retrieving stood codes from a computerized engine
control system, a hard fault is found regarding a fuel injector circuit.
Tech A says that fuel pressure and volume tests should be
performed. Tech B says that the injectors should be replaced on
that circuit. Who is right?
A. Tech A only
B. Tech B only
C. Both A and B
D.Neither A or B
Give this one a try later!
D. Neither. The secondary air injection system injects air into the exhaust system.
It doesn't not reduce spark knock since the secondary air injection system is
used after the combustion event.
D. The PCM/ECM opens the canister purge valve to cause a vacuum in the Evap
system. All other options are leaks that would prevent a vacuum from being
created.
D. Tech A is wrong because fuel pressure wouldn't throw a injector
circuit code. Tech B is jumping to conclusions and should test the
injector circuit first.
, C. With the piston at TDC on the exhaust stroke, both valves should open
slightly because of valve overlap.. The exhaust valve should close a few
degrees after TDC and the intake valve should open a few degrees before.
Don't know?
4 of 85
Term
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.
Give this one a try later!
C. overcharging is indicated by
short light bulb life C
B A
Don't know?
5 of 85
Term
72. A vehicle with multiport fuel injection has a stalling
problem . When the throttle body is inspected it is found to be
contaminated with sludge buildup . Tech- nician A says that this
could be caused by worn rings . Technician B says that this could
be caused by a
