ASE A1 (ENGINE REPAIR) PRACTICE
TEST – CUMULATIVE FINAL TEST 2026
QUESTIONS WITH CORRECT
ANSWERS GRADED A+
◍ 1. an engine miss is being diagnosed using a cylinder leakage test.
Technician A says that any cylinder with over 20% leakage has excessive
leakage. Tech B says that air leaking from the tailpipe indicates a cracked
cylinder.A onlyB onlyBoth A & BNeither A nor B.
Answer: A onlyIf cylinder leakage exceeds 20%, check for air escaping the
tailpipe, the PCV valve opening in the rocker arm cover, and the top of the
throttle body or carburetor.Air leaking from the tailpipe usually indicates an
exhaust valve leak
◍ 23. during a compression test, a cylinder has 40% of the specified
compression reading. When the tech performs a wet test, the compression
reading on this cylinder has 75% of the specified reading. The cause of the
low compression reading could beworn piston ringsa burned exhaust valvea
bent intake valvea worn camshaft lobe.
Answer: worn piston ringsif compression increases during a wet test, this
indicates worn piston rings. Compression would not increase if an exhaust
valve is burned, intake valve is bent, or camshaft lobe is worn.
◍ A ridge has formed on an engine block just above the piston ring's travel.
Which of the following is used to remove the ridge?
A. A cylinder ridge reamer
B. A flexible beaded hone
C. Both A and B
D. Neither A or B.
, Answer: A. Cylinder ridge reamer
◍ A vehicle briefly blows blue-gray exhaust smoke from its tailpipe only in
the morning or after it's been sitting for a while. Which of the following
causing the condition?
A. Leaking cylinder head gasket
B. Leaking valve stem seals
C. A leaking fuel injector
D. Worn piston rings.
Answer: C. Leaking valve stem seals
◍ Two technicians discussing engine sealants and form in place of gaskets.
Tech A says sealants such as RTV are aerobic. Tech B says some sensors
may be damaged if an unapproved sealant is used. Who is correct?
A. Tech A
B. Tech B
C. Tech A and Tech B
D. Neither Tech A or B.
Answer: C. Tech A and Tech B
◍ 35. the customer complains that the engine cranks but does not start; the first
thing to check should bevalve train operationbattery
voltagecompressionengine vacuum.
Answer: valve train operationif the engine cranks properly, the battery is not
the problem. Compression would not be the FIRST test, and because engine
vacuum is low during a crank, a vacuum test would not be conclusive.
◍ 40. during a cylinder balance test on an engine with fuel injection, one
cylinder provides very little rpm drop. Tech A says the ignition system may
be misfiring on that cylinder. Tech B says the engine may have an intake
manifold vacuum leak.A onlyB onlyBoth A & BNeither A nor B.
Answer: Both A&BBoth a misfiring ignition system and an intake manifold
leak could cause a cylinder to contribute too little power
◍ 54. while discussing basic diagnostic procedures, Tech A says the most
complicated diagnostic tests should be performed first. Tech B says that you
, should first question the customer to obtain as much info as possible about
the problemAB A & BNeither.
Answer: BAlways attempt the more simple diagnosis first
◍ 57. with the engine idling, a vacuum gauge connected to the intake manifold
fluctuates (from 15 to 20). These fluctuations may be caused bylate ignition
timingintake manifold vacuum leaksa restricted exhaust systemsticky valve
stems and guides.
Answer: sticky valve stems and guides-late ignition timing would result in a
low, steady reading-intake manifold leaks would cause a very low, steady
reading-a restricted exhaust system would cause vacuum to slowly decrease
after the engine was accelerated and held steady
◍ 59. oil is leaking from the crankshaft rear main bearing seal on an engine.
Tech A says the oil seal could be faulty. Tech B says the PCV system may
not be functioning.ABA & BNeither.
Answer: A&B
◍ An engine suffers from detonation. Tech A this may be caused by a
defective EGR valve. Tech B says advanced ignition timing can cause this
condition. Who is correct?
A. Tech A
B. Tech B
C. Both Tech A and B
D. Neither Tech A or B.
Answer: C. Both Tech A and Tech B
◍ 60. A high-pitched squealing noise is heard during hard acceleration. This
may be the cause of:intake manifold leakthe choke stuck closedfuel system
leaksmall leak in exhaust manifold.
Answer: small leak in exhaust manifold-intake manifold leak causes a
high-pitched whistle at idle and low speeds-carb choke stuck closed will not
cause a high-pitched whistle-fuel system leak normally would not cause a
noise
◍ 61. a heavy thumping noise occurs with the engine idling, but the oil
, pressure is normal. this may be caused by:worn pistons and cylindersloose
flywheel boltsworm main bearingsloose camshaft bearings.
Answer: loose flywheel bolts-worn pistons and cylinders would cause a
thumping noise during acceleration-worn main bearings cause a thump
when the engine is started-loose camshaft bearings would cause a growling
noise at all times
◍ After diagnosing and replacing the cooling system's water pump, the vehicle
engine continues to overheat. Which of these is the MOST likely cause?
A. An air pocket in the system.
B. Leaking head gasket
C. Faulty replacement water pump
D. The radiator.
Answer: A. An air pocket in the system.
◍ Two technicians are discussing the camshaft in a V8 engine. Tech A says to
use the an outside micrometer to measure the diameter of a camshaft
journal. Tech B says camshaft spins twice for every one revolution of the
crankshaft. Who is correct?
A. Tech A
B. Tech B
C. Tech A and B
D. Neither Tech A or B.
Answer: A. Technician A - use an outside micrometer to measure the
diameter of a camshaft journal.
◍ During initial inspection the technician notices that there's a strong sulfur
odor emitting from the vehicle's tailpipe. The customer states that the
vehicle has been getting poor fuel mileage. The MOST likely cause of this
condition is:
A. A lean fuel condition
B. Leaking head gasket
C. Worn piston rings
D. A rich fuel condition..
TEST – CUMULATIVE FINAL TEST 2026
QUESTIONS WITH CORRECT
ANSWERS GRADED A+
◍ 1. an engine miss is being diagnosed using a cylinder leakage test.
Technician A says that any cylinder with over 20% leakage has excessive
leakage. Tech B says that air leaking from the tailpipe indicates a cracked
cylinder.A onlyB onlyBoth A & BNeither A nor B.
Answer: A onlyIf cylinder leakage exceeds 20%, check for air escaping the
tailpipe, the PCV valve opening in the rocker arm cover, and the top of the
throttle body or carburetor.Air leaking from the tailpipe usually indicates an
exhaust valve leak
◍ 23. during a compression test, a cylinder has 40% of the specified
compression reading. When the tech performs a wet test, the compression
reading on this cylinder has 75% of the specified reading. The cause of the
low compression reading could beworn piston ringsa burned exhaust valvea
bent intake valvea worn camshaft lobe.
Answer: worn piston ringsif compression increases during a wet test, this
indicates worn piston rings. Compression would not increase if an exhaust
valve is burned, intake valve is bent, or camshaft lobe is worn.
◍ A ridge has formed on an engine block just above the piston ring's travel.
Which of the following is used to remove the ridge?
A. A cylinder ridge reamer
B. A flexible beaded hone
C. Both A and B
D. Neither A or B.
, Answer: A. Cylinder ridge reamer
◍ A vehicle briefly blows blue-gray exhaust smoke from its tailpipe only in
the morning or after it's been sitting for a while. Which of the following
causing the condition?
A. Leaking cylinder head gasket
B. Leaking valve stem seals
C. A leaking fuel injector
D. Worn piston rings.
Answer: C. Leaking valve stem seals
◍ Two technicians discussing engine sealants and form in place of gaskets.
Tech A says sealants such as RTV are aerobic. Tech B says some sensors
may be damaged if an unapproved sealant is used. Who is correct?
A. Tech A
B. Tech B
C. Tech A and Tech B
D. Neither Tech A or B.
Answer: C. Tech A and Tech B
◍ 35. the customer complains that the engine cranks but does not start; the first
thing to check should bevalve train operationbattery
voltagecompressionengine vacuum.
Answer: valve train operationif the engine cranks properly, the battery is not
the problem. Compression would not be the FIRST test, and because engine
vacuum is low during a crank, a vacuum test would not be conclusive.
◍ 40. during a cylinder balance test on an engine with fuel injection, one
cylinder provides very little rpm drop. Tech A says the ignition system may
be misfiring on that cylinder. Tech B says the engine may have an intake
manifold vacuum leak.A onlyB onlyBoth A & BNeither A nor B.
Answer: Both A&BBoth a misfiring ignition system and an intake manifold
leak could cause a cylinder to contribute too little power
◍ 54. while discussing basic diagnostic procedures, Tech A says the most
complicated diagnostic tests should be performed first. Tech B says that you
, should first question the customer to obtain as much info as possible about
the problemAB A & BNeither.
Answer: BAlways attempt the more simple diagnosis first
◍ 57. with the engine idling, a vacuum gauge connected to the intake manifold
fluctuates (from 15 to 20). These fluctuations may be caused bylate ignition
timingintake manifold vacuum leaksa restricted exhaust systemsticky valve
stems and guides.
Answer: sticky valve stems and guides-late ignition timing would result in a
low, steady reading-intake manifold leaks would cause a very low, steady
reading-a restricted exhaust system would cause vacuum to slowly decrease
after the engine was accelerated and held steady
◍ 59. oil is leaking from the crankshaft rear main bearing seal on an engine.
Tech A says the oil seal could be faulty. Tech B says the PCV system may
not be functioning.ABA & BNeither.
Answer: A&B
◍ An engine suffers from detonation. Tech A this may be caused by a
defective EGR valve. Tech B says advanced ignition timing can cause this
condition. Who is correct?
A. Tech A
B. Tech B
C. Both Tech A and B
D. Neither Tech A or B.
Answer: C. Both Tech A and Tech B
◍ 60. A high-pitched squealing noise is heard during hard acceleration. This
may be the cause of:intake manifold leakthe choke stuck closedfuel system
leaksmall leak in exhaust manifold.
Answer: small leak in exhaust manifold-intake manifold leak causes a
high-pitched whistle at idle and low speeds-carb choke stuck closed will not
cause a high-pitched whistle-fuel system leak normally would not cause a
noise
◍ 61. a heavy thumping noise occurs with the engine idling, but the oil
, pressure is normal. this may be caused by:worn pistons and cylindersloose
flywheel boltsworm main bearingsloose camshaft bearings.
Answer: loose flywheel bolts-worn pistons and cylinders would cause a
thumping noise during acceleration-worn main bearings cause a thump
when the engine is started-loose camshaft bearings would cause a growling
noise at all times
◍ After diagnosing and replacing the cooling system's water pump, the vehicle
engine continues to overheat. Which of these is the MOST likely cause?
A. An air pocket in the system.
B. Leaking head gasket
C. Faulty replacement water pump
D. The radiator.
Answer: A. An air pocket in the system.
◍ Two technicians are discussing the camshaft in a V8 engine. Tech A says to
use the an outside micrometer to measure the diameter of a camshaft
journal. Tech B says camshaft spins twice for every one revolution of the
crankshaft. Who is correct?
A. Tech A
B. Tech B
C. Tech A and B
D. Neither Tech A or B.
Answer: A. Technician A - use an outside micrometer to measure the
diameter of a camshaft journal.
◍ During initial inspection the technician notices that there's a strong sulfur
odor emitting from the vehicle's tailpipe. The customer states that the
vehicle has been getting poor fuel mileage. The MOST likely cause of this
condition is:
A. A lean fuel condition
B. Leaking head gasket
C. Worn piston rings
D. A rich fuel condition..
