ASE A1 (ENGINE REPAIR) PRACTICE
TEST – CUMULATIVE ACTUAL EXAM
PAPER 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ The reading on the outside metric micrometer in the illustration above
indicates
A. 6.50mm
B. 6.00mm
C. 6.50mm.
Answer: A.6.50mm
◍ 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
only,B only, A & B,Neither ..
Answer: A only:If 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
◍ 2.when removing and replacing piston rings on a cast aluminum alloy piston
the the technician should:
A. use the old ring and a feeler gauge to measure piston ring groove
clearance
B. clean the piston in a caustic hot tank
C. use a drill and a sanding disc to remove tarnish
D. use the new ring and a feeler gauge to measure piston ring groove
clearance.
, Answer: D. Use the new ring and a feeler gauge to measure piston ring
groove clearance
◍ 3.during a cylinder power balance test on a COP ignition system the rpm
drop of the #5 cylinder is less than the others all of the following will cause
this test result except
A. A faulty ignition coil
B. A faulty exhaust valve
C. A faulty fuel pressure regulator
D. A faulty fuel pressure regulator.
Answer: C. A faulty fuel pressure regulator
◍ 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 rings,a burned exhaust valve,a bent intake
valve,a 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.
◍ the customer complains that the engine cranks but does not start; the first
thing to check should bevalve train operation,battery
voltage,compression,engine vacuum,.
Answer: valve train operation:if 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.
◍ 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 only,B only, A & B,Neither ,.
Answer: Both A&BBoth a misfiring ignition system and an intake manifold
leak could cause a cylinder to contribute too little power
,◍ 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 problemA,B ,A & B,Neither,.
Answer: BAlways attempt the more simple diagnosis first
◍ 4.A turbocharged engine has poor high end performance Technician A says
too much exhaust pressure bypassing the turbine wheel results in this
conduit technician B says a stuck closed wastegate results in under boost
and poor high end performance. Who is correct?
A. technician A
B. Technician B
C. Both A and B
D. neither A or B.
Answer: A. Technician A
◍ with the engine idling, a vacuum gauge connected to the intake manifold
fluctuates (from 15 to 20). These fluctuations may be caused bylate ignition
timing,intake manifold vacuum leaks,a restricted exhaust system,sticky
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
◍ 5.which of the following is most likely causing an engine to have excessive
crankshaft endplay?
A. worn rod bearings
B. worn thrust bearings
C. worn crankshaft main bearings
D. worn camshaft bearings.
Answer: B.worn thrust bearings
◍ 6.A compression test indicates the number one cylinders compression is
below specifications. The compression increases after injecting oil into the
, cylinder. Which of the following is causing this test result?
A. Worn piston rings
B. A faulty intake valve.
C. A faulty head gasket
D. A faulty exhaust valve.
Answer: A.worn piston rings.
◍ 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.A,B,A & B,Neither,.
Answer: A&B
◍ A high-pitched squealing noise is heard during hard acceleration. This may
be the cause of:intake manifold leak,the 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
◍ 7.A vehicle has blue gray colored exhaust emitting from its tailpipe in e all
of the following results in this condition except
A. worn piston rings
B. A leaking fuel injector
C. Leaking valve seals
D. A clogged pvc valve.
Answer: A leaking fuel injector
◍ 8.A ridge has formed on an engine block just above the piston rings travel.
Which of the following is used to remove this ridge
A. A cylinder ridge reamer
B. A flexible beaded home
C. Both A or B
D. Neither A or B.
Answer: A. A cylinder ridge reamer
TEST – CUMULATIVE ACTUAL EXAM
PAPER 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ The reading on the outside metric micrometer in the illustration above
indicates
A. 6.50mm
B. 6.00mm
C. 6.50mm.
Answer: A.6.50mm
◍ 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
only,B only, A & B,Neither ..
Answer: A only:If 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
◍ 2.when removing and replacing piston rings on a cast aluminum alloy piston
the the technician should:
A. use the old ring and a feeler gauge to measure piston ring groove
clearance
B. clean the piston in a caustic hot tank
C. use a drill and a sanding disc to remove tarnish
D. use the new ring and a feeler gauge to measure piston ring groove
clearance.
, Answer: D. Use the new ring and a feeler gauge to measure piston ring
groove clearance
◍ 3.during a cylinder power balance test on a COP ignition system the rpm
drop of the #5 cylinder is less than the others all of the following will cause
this test result except
A. A faulty ignition coil
B. A faulty exhaust valve
C. A faulty fuel pressure regulator
D. A faulty fuel pressure regulator.
Answer: C. A faulty fuel pressure regulator
◍ 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 rings,a burned exhaust valve,a bent intake
valve,a 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.
◍ the customer complains that the engine cranks but does not start; the first
thing to check should bevalve train operation,battery
voltage,compression,engine vacuum,.
Answer: valve train operation:if 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.
◍ 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 only,B only, A & B,Neither ,.
Answer: Both A&BBoth a misfiring ignition system and an intake manifold
leak could cause a cylinder to contribute too little power
,◍ 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 problemA,B ,A & B,Neither,.
Answer: BAlways attempt the more simple diagnosis first
◍ 4.A turbocharged engine has poor high end performance Technician A says
too much exhaust pressure bypassing the turbine wheel results in this
conduit technician B says a stuck closed wastegate results in under boost
and poor high end performance. Who is correct?
A. technician A
B. Technician B
C. Both A and B
D. neither A or B.
Answer: A. Technician A
◍ with the engine idling, a vacuum gauge connected to the intake manifold
fluctuates (from 15 to 20). These fluctuations may be caused bylate ignition
timing,intake manifold vacuum leaks,a restricted exhaust system,sticky
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
◍ 5.which of the following is most likely causing an engine to have excessive
crankshaft endplay?
A. worn rod bearings
B. worn thrust bearings
C. worn crankshaft main bearings
D. worn camshaft bearings.
Answer: B.worn thrust bearings
◍ 6.A compression test indicates the number one cylinders compression is
below specifications. The compression increases after injecting oil into the
, cylinder. Which of the following is causing this test result?
A. Worn piston rings
B. A faulty intake valve.
C. A faulty head gasket
D. A faulty exhaust valve.
Answer: A.worn piston rings.
◍ 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.A,B,A & B,Neither,.
Answer: A&B
◍ A high-pitched squealing noise is heard during hard acceleration. This may
be the cause of:intake manifold leak,the 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
◍ 7.A vehicle has blue gray colored exhaust emitting from its tailpipe in e all
of the following results in this condition except
A. worn piston rings
B. A leaking fuel injector
C. Leaking valve seals
D. A clogged pvc valve.
Answer: A leaking fuel injector
◍ 8.A ridge has formed on an engine block just above the piston rings travel.
Which of the following is used to remove this ridge
A. A cylinder ridge reamer
B. A flexible beaded home
C. Both A or B
D. Neither A or B.
Answer: A. A cylinder ridge reamer
