ASE A1 (Engine Repair) Practice Test –
Cumulative Questions and Answers
Latest Version Already Passed
What is the likely cause of a knocking noise that increases with engine RPM and occurs under
load?
A. Faulty alternator
✔✔B. Worn connecting rod bearings
C. Loose serpentine belt
D. Low coolant level
Which tool is best used to measure cylinder taper?
A. Caliper
✔✔B. Dial bore gauge
C. Micrometer
D. Compression tester
A customer complains of blue smoke from the tailpipe. What is the most probable cause?
✔✔A. Engine burning oil
1
,B. Coolant leak into exhaust
C. Dirty air filter
D. Rich fuel mixture
A worn timing chain will most likely cause:
A. Loud knocking at idle
B. Low oil pressure
✔✔C. Incorrect valve timing
D. High compression
If a cylinder has low compression, and a wet compression test raises the pressure, what is the
most likely issue?
✔✔A. Worn piston rings
B. Leaking head gasket
C. Cracked cylinder head
D. Faulty valve spring
Which component maintains proper valve lash in many overhead cam engines?
2
,✔✔A. Hydraulic lifters
B. Camshaft phasers
C. Rocker arm bolts
D. Valve seals
An engine overheats only at highway speeds. Technician A says a restricted radiator may be the
cause. Technician B says a faulty fan clutch is to blame. Who is correct?
✔✔A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
A broken timing belt on an interference engine may result in:
✔✔A. Bent valves
B. Overheated pistons
C. Seized oil pump
D. Burned head gasket
3
, What is the function of the PCV valve?
✔✔A. Removes blow-by gases from the crankcase
B. Increases air intake volume
C. Controls spark timing
D. Regulates fuel pressure
Which of the following could cause engine oil to appear milky or foamy?
A. Fuel contamination
✔✔B. Coolant mixing with oil
C. Worn piston rings
D. Oxidized fuel
What is the most common cause of a rough idle after a head gasket replacement?
A. Weak battery
✔✔B. Vacuum leak
C. Clogged radiator
D. Slipping timing belt
4
Cumulative Questions and Answers
Latest Version Already Passed
What is the likely cause of a knocking noise that increases with engine RPM and occurs under
load?
A. Faulty alternator
✔✔B. Worn connecting rod bearings
C. Loose serpentine belt
D. Low coolant level
Which tool is best used to measure cylinder taper?
A. Caliper
✔✔B. Dial bore gauge
C. Micrometer
D. Compression tester
A customer complains of blue smoke from the tailpipe. What is the most probable cause?
✔✔A. Engine burning oil
1
,B. Coolant leak into exhaust
C. Dirty air filter
D. Rich fuel mixture
A worn timing chain will most likely cause:
A. Loud knocking at idle
B. Low oil pressure
✔✔C. Incorrect valve timing
D. High compression
If a cylinder has low compression, and a wet compression test raises the pressure, what is the
most likely issue?
✔✔A. Worn piston rings
B. Leaking head gasket
C. Cracked cylinder head
D. Faulty valve spring
Which component maintains proper valve lash in many overhead cam engines?
2
,✔✔A. Hydraulic lifters
B. Camshaft phasers
C. Rocker arm bolts
D. Valve seals
An engine overheats only at highway speeds. Technician A says a restricted radiator may be the
cause. Technician B says a faulty fan clutch is to blame. Who is correct?
✔✔A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
A broken timing belt on an interference engine may result in:
✔✔A. Bent valves
B. Overheated pistons
C. Seized oil pump
D. Burned head gasket
3
, What is the function of the PCV valve?
✔✔A. Removes blow-by gases from the crankcase
B. Increases air intake volume
C. Controls spark timing
D. Regulates fuel pressure
Which of the following could cause engine oil to appear milky or foamy?
A. Fuel contamination
✔✔B. Coolant mixing with oil
C. Worn piston rings
D. Oxidized fuel
What is the most common cause of a rough idle after a head gasket replacement?
A. Weak battery
✔✔B. Vacuum leak
C. Clogged radiator
D. Slipping timing belt
4
