ASE A1 ENGINE REPAIR Practice Test
Questions with 100% Correct Answers
Latest Update Top Rated A+
A high-pitched squealing noise is heard during hard acceleration. This may be the cause of:
intake manifold leak,
the choke stuck closed
fuel system leak
small 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
a heavy thumping noise occurs with the engine idling, but the oil pressure is normal. this may be
caused by:
worn pistons and cylinders,
loose flywheel bolts,
worm main bearings,
loose 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 a vehicle is parked overnight and then started in the morning, the engine has a lifter noise
that disappears after running for a short time. this may be caused by:
low oil pressure,
low oil level,
worn lifter bottom,
excessive lifter leak-down, - ANSWER excessive lifter leak-down
,low oil pressure would result in a continuous noise
low oil level would result in a continuous noise
worn lifter bottom would result in a continuous noise
when using a compression tester, the readings on the cylinders are all even, but lower than
spec. this could indicate:
blown head gasket,
carbon buildup,
cracked head,
worn rings and cylinders, - ANSWER worn rings and cylinders
-a low reading on two adjacent cylinders may indicate a blown head gasket
-carbon buildup would cause a high reading
-a low reading on two adjacent cylinders may indicate a cracked head
a cylinder balance test is being performed on an engine to determine which cylinder is causing a
miss.
Tech A says that when the faulty cylinder is disabled, engine rpm will drop more than for the
other cylinders.
Tech B says disabling the faulty cylinder will cause the engine to stall
A,
B,
Both,
Neither, - ANSWER Neither
the faulty cylinder will not cause the engine to stall, neither will it cause the engine to drop in
RPM since it is faulty.
an engine is idling at 750 rpm. the pointer on the vacuum gauge is floating between 11 and 16 in
Hg. The most likely cause is
retarded timing,
advanced timing,
stuch EGR valve,
too lean idle mixture, - ANSWER too lean idle mixture
,all others would not result in gauge fluctuation
the first step a Tech should take for diagnosis is:
think of possible causes of the problem,
question the customer,
road test the vehicle,
listen to the customer, - ANSWER listen to the customer
the customer says that the engine requires excessive cranking to start. the LEAST likely cause
of this problem would be:
cracked cylinder block,
jumped timing belt,
faulty fuel pump,
stuck-open EGR valve, - ANSWER cracked cylinder block
which of the following is LEAST likely to cause engine noise?
loose pistons,
worn cylinders,
worn main bearings,
loose camshaft bearings, - ANSWER loose cam bearings
-loose pistons may cause a rapping noise while accel
-worn cylinders may cause a rapping noise while accel
-worn main bearings may cause a thumping noise when starting
the least likely first step in a diagnosis would be to:
question the customer for more info,
be sure that the customer complaint is eliminated
start with the most difficult test
, road test the vehicle - ANSWER start with the most difficult test
a cylinder balance test on a carbureted engine has revealed one cylinder is contributing less
power than the others. The LEAST likely cause of this is:
faulty ignition system
burned exhaust valve
faulty carburetor
leaking intake manifold - ANSWER faulty carburetor
-faulty ignition system, burned exhaust valve, and leaking intake manifold are likely to cause one
cylinder to provide less power than others. The carburetor would not cause one single cylinder to
contribute less power.
an excessive sulfur smell in the exhaust with a cat can be an indication of:
lean fuel mixture
coolant leaking into combustion chamber
rich fuel mixture
vacuum leak - ANSWER rich fuel mixture
-lean fuel mixture would not cause a sulfur smell
-coolant leaking into the chamber would cause a gray exhaust color
-a vacuum leak would cause a rough idle that would decrease as engine speed increases
a low, steady vacuum gauge reading from 11 to 15 indicates:
burned or leaking valves
Questions with 100% Correct Answers
Latest Update Top Rated A+
A high-pitched squealing noise is heard during hard acceleration. This may be the cause of:
intake manifold leak,
the choke stuck closed
fuel system leak
small 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
a heavy thumping noise occurs with the engine idling, but the oil pressure is normal. this may be
caused by:
worn pistons and cylinders,
loose flywheel bolts,
worm main bearings,
loose 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 a vehicle is parked overnight and then started in the morning, the engine has a lifter noise
that disappears after running for a short time. this may be caused by:
low oil pressure,
low oil level,
worn lifter bottom,
excessive lifter leak-down, - ANSWER excessive lifter leak-down
,low oil pressure would result in a continuous noise
low oil level would result in a continuous noise
worn lifter bottom would result in a continuous noise
when using a compression tester, the readings on the cylinders are all even, but lower than
spec. this could indicate:
blown head gasket,
carbon buildup,
cracked head,
worn rings and cylinders, - ANSWER worn rings and cylinders
-a low reading on two adjacent cylinders may indicate a blown head gasket
-carbon buildup would cause a high reading
-a low reading on two adjacent cylinders may indicate a cracked head
a cylinder balance test is being performed on an engine to determine which cylinder is causing a
miss.
Tech A says that when the faulty cylinder is disabled, engine rpm will drop more than for the
other cylinders.
Tech B says disabling the faulty cylinder will cause the engine to stall
A,
B,
Both,
Neither, - ANSWER Neither
the faulty cylinder will not cause the engine to stall, neither will it cause the engine to drop in
RPM since it is faulty.
an engine is idling at 750 rpm. the pointer on the vacuum gauge is floating between 11 and 16 in
Hg. The most likely cause is
retarded timing,
advanced timing,
stuch EGR valve,
too lean idle mixture, - ANSWER too lean idle mixture
,all others would not result in gauge fluctuation
the first step a Tech should take for diagnosis is:
think of possible causes of the problem,
question the customer,
road test the vehicle,
listen to the customer, - ANSWER listen to the customer
the customer says that the engine requires excessive cranking to start. the LEAST likely cause
of this problem would be:
cracked cylinder block,
jumped timing belt,
faulty fuel pump,
stuck-open EGR valve, - ANSWER cracked cylinder block
which of the following is LEAST likely to cause engine noise?
loose pistons,
worn cylinders,
worn main bearings,
loose camshaft bearings, - ANSWER loose cam bearings
-loose pistons may cause a rapping noise while accel
-worn cylinders may cause a rapping noise while accel
-worn main bearings may cause a thumping noise when starting
the least likely first step in a diagnosis would be to:
question the customer for more info,
be sure that the customer complaint is eliminated
start with the most difficult test
, road test the vehicle - ANSWER start with the most difficult test
a cylinder balance test on a carbureted engine has revealed one cylinder is contributing less
power than the others. The LEAST likely cause of this is:
faulty ignition system
burned exhaust valve
faulty carburetor
leaking intake manifold - ANSWER faulty carburetor
-faulty ignition system, burned exhaust valve, and leaking intake manifold are likely to cause one
cylinder to provide less power than others. The carburetor would not cause one single cylinder to
contribute less power.
an excessive sulfur smell in the exhaust with a cat can be an indication of:
lean fuel mixture
coolant leaking into combustion chamber
rich fuel mixture
vacuum leak - ANSWER rich fuel mixture
-lean fuel mixture would not cause a sulfur smell
-coolant leaking into the chamber would cause a gray exhaust color
-a vacuum leak would cause a rough idle that would decrease as engine speed increases
a low, steady vacuum gauge reading from 11 to 15 indicates:
burned or leaking valves
