ASE A1- Engine Repair Questions and
Answers Latest Version Already Passed
A technician finds coolant in the engine oil. What is the most likely cause?
A. Faulty oil filter housing
✔✔B. Cracked cylinder head
C. Leaking timing cover gasket
D. Malfunctioning oil cooler
A vehicle has low oil pressure at idle but normal pressure at higher RPM. What is the most likely
cause?
A. Clogged oil passages
B. Faulty oil pressure sensor
✔✔C. Worn engine bearings
D. Overfilled oil level
A car is hard to start when hot but starts fine when cold. What could be the cause?
A. Weak ignition coil
✔✔B. Failing crankshaft position sensor
1
,C. Low oil pressure
D. Vacuum leak
A customer complains of rough idle and misfire on cylinder #2. What is the most likely cause?
A. Failing ignition switch
✔✔B. Faulty fuel injector
C. Low battery voltage
D. Dirty mass airflow sensor
During a cylinder leak-down test, air is heard escaping from the throttle body. What does this
indicate?
✔✔A. Intake valve is leaking
B. Exhaust valve is leaking
C. Cylinder wall damage
D. PCV valve stuck open
A knocking noise that increases with engine speed is heard. What is the most likely cause?
✔✔A. Worn connecting rod bearing
2
,B. Loose accessory belt
C. Bad fuel pump
D. Engine coolant temperature sensor
A car emits continuous white smoke from the exhaust. Which of the following is most likely the
cause?
✔✔A. Coolant entering the combustion chamber
B. Rich air-fuel mixture
C. Worn valve seals
D. Faulty spark plugs
A fluctuating idle on a fuel-injected engine may be caused by:
A. Failing ignition module
✔✔B. Vacuum leak
C. Slipping timing belt
D. Cracked cylinder wall
A technician finds that the engine cranks slowly and makes a clicking sound. What is the most
likely issue?
3
, A. Faulty crankshaft sensor
✔✔B. Weak battery or poor cable connection
C. Blown head gasket
D. Dirty fuel filter
An engine overheats after driving for 15 minutes. Which of the following is the most likely
cause?
A. Bad ignition coil
✔✔B. Stuck thermostat
C. Low transmission fluid
D. Clogged fuel injector
A technician observes oil sludge buildup inside the engine. What could be the most likely cause?
✔✔A. Infrequent oil changes
B. Using premium fuel
C. Leaking head gasket
D. Low tire pressure
4
Answers Latest Version Already Passed
A technician finds coolant in the engine oil. What is the most likely cause?
A. Faulty oil filter housing
✔✔B. Cracked cylinder head
C. Leaking timing cover gasket
D. Malfunctioning oil cooler
A vehicle has low oil pressure at idle but normal pressure at higher RPM. What is the most likely
cause?
A. Clogged oil passages
B. Faulty oil pressure sensor
✔✔C. Worn engine bearings
D. Overfilled oil level
A car is hard to start when hot but starts fine when cold. What could be the cause?
A. Weak ignition coil
✔✔B. Failing crankshaft position sensor
1
,C. Low oil pressure
D. Vacuum leak
A customer complains of rough idle and misfire on cylinder #2. What is the most likely cause?
A. Failing ignition switch
✔✔B. Faulty fuel injector
C. Low battery voltage
D. Dirty mass airflow sensor
During a cylinder leak-down test, air is heard escaping from the throttle body. What does this
indicate?
✔✔A. Intake valve is leaking
B. Exhaust valve is leaking
C. Cylinder wall damage
D. PCV valve stuck open
A knocking noise that increases with engine speed is heard. What is the most likely cause?
✔✔A. Worn connecting rod bearing
2
,B. Loose accessory belt
C. Bad fuel pump
D. Engine coolant temperature sensor
A car emits continuous white smoke from the exhaust. Which of the following is most likely the
cause?
✔✔A. Coolant entering the combustion chamber
B. Rich air-fuel mixture
C. Worn valve seals
D. Faulty spark plugs
A fluctuating idle on a fuel-injected engine may be caused by:
A. Failing ignition module
✔✔B. Vacuum leak
C. Slipping timing belt
D. Cracked cylinder wall
A technician finds that the engine cranks slowly and makes a clicking sound. What is the most
likely issue?
3
, A. Faulty crankshaft sensor
✔✔B. Weak battery or poor cable connection
C. Blown head gasket
D. Dirty fuel filter
An engine overheats after driving for 15 minutes. Which of the following is the most likely
cause?
A. Bad ignition coil
✔✔B. Stuck thermostat
C. Low transmission fluid
D. Clogged fuel injector
A technician observes oil sludge buildup inside the engine. What could be the most likely cause?
✔✔A. Infrequent oil changes
B. Using premium fuel
C. Leaking head gasket
D. Low tire pressure
4
