ADVANCED ENGINE REPAIR QUESTIONS AND
ANSWERS FOR STUDY AND EXAM PREP.
PREVIEWED AND VERIFIED
1. What fuel system component is used in a vehicle equipped
with a diesel engine that is not usually used on the same vehicle
when it is equipped with a gasoline engine? Water-fuel
separator
2. The use of a variable vane turbocharger allows the
elimination of the .: Turbocharger wastegate
3. Technician A says that glow plugs are used to help start a
diesel engine and are shut off as soon as the engine starts.
Technician B says that the glow plugs are turned off as soon as a
flame is detected in the combustion chamber. Which technician
is correct? Neither Technician
4. Which of these takes place during regeneration in a diesel
particulate filter (DPF)? Soot is being burned
5. How is diesel fuel ignited in a warm diesel engine? Heat of
compression
6. Selective catalytic reduction (SCR) uses urea injection to
reduce emissions.: NOX
7. Which of the following may be a symptom of injector O-ring
trouble in a HEUI system? The fuel filter element turning black
8. What color exhaust smoke occurs most often during cold
engine starts because the smoke is usually condensed fuel
droplets? White
9. What part should be removed to test cylinder
compression on a diesel engine? Glow plug or injector
10. Which diesel system supplies high-pressure diesel fuel to
all of the injectors all of the time? High pressure common rail
1 1. Engine oil pressure at 3500 RPM should be at least
PSI.: 35 12. Technician A says that a leaking head gasket can be
, ADVANCED ENGINE REPAIR QUESTIONS AND
ANSWERS FOR STUDY AND EXAM PREP.
PREVIEWED AND VERIFIED
tested for by using a chemical tester. Technician B says that a
leaking head gasket can be found using an exhaust gas analyzer.
Who is correct? Both Techs
13. A good engine should produce how much compression
during a running (dynamic) compression test at idle? 60 to 90 psi
14. A smoothly operating engine depends on : equal
compression between cylinders
15. A vehicle's oil pressure warning light is on. Technician A says
that the pressure sending unit should be replaced and the
vehicle re-checked. Technician B says that a mechanical oil
pressure gauge should be used to check the oil pressure before
replacing the sending unit. Which technician is correct? Tech B
16. Which of the following is the LEAST LIKELY to cause an
engine noise? Vacuum leak
17. Two technicians are discussing oil leaks. Technician A says
that an oil leak can be found using a fluorescent dye in the oil
with a black light to check for leaks. Technician B says that a
white spray powder can be used to locate oil leaks. Who is
right? Both Techs
18. Technician A says that the first step in diagnosing engine
condition is to perform a thorough visual inspection. Technician
B says that oil leaks can be found by measuring straight up from
where the oil drips on the floor. Who is right? Tech A
19. A technician is performing a cylinder leak test. The leakage
on all cylinders is less than 10% on all cylinders except for one,
which indicates 80% leakage. What should the technician do?
Repeat the test (cylinder was not at T DC) 20. During a dry
compression test the first puff of the test shows 50 PSI and the
ANSWERS FOR STUDY AND EXAM PREP.
PREVIEWED AND VERIFIED
1. What fuel system component is used in a vehicle equipped
with a diesel engine that is not usually used on the same vehicle
when it is equipped with a gasoline engine? Water-fuel
separator
2. The use of a variable vane turbocharger allows the
elimination of the .: Turbocharger wastegate
3. Technician A says that glow plugs are used to help start a
diesel engine and are shut off as soon as the engine starts.
Technician B says that the glow plugs are turned off as soon as a
flame is detected in the combustion chamber. Which technician
is correct? Neither Technician
4. Which of these takes place during regeneration in a diesel
particulate filter (DPF)? Soot is being burned
5. How is diesel fuel ignited in a warm diesel engine? Heat of
compression
6. Selective catalytic reduction (SCR) uses urea injection to
reduce emissions.: NOX
7. Which of the following may be a symptom of injector O-ring
trouble in a HEUI system? The fuel filter element turning black
8. What color exhaust smoke occurs most often during cold
engine starts because the smoke is usually condensed fuel
droplets? White
9. What part should be removed to test cylinder
compression on a diesel engine? Glow plug or injector
10. Which diesel system supplies high-pressure diesel fuel to
all of the injectors all of the time? High pressure common rail
1 1. Engine oil pressure at 3500 RPM should be at least
PSI.: 35 12. Technician A says that a leaking head gasket can be
, ADVANCED ENGINE REPAIR QUESTIONS AND
ANSWERS FOR STUDY AND EXAM PREP.
PREVIEWED AND VERIFIED
tested for by using a chemical tester. Technician B says that a
leaking head gasket can be found using an exhaust gas analyzer.
Who is correct? Both Techs
13. A good engine should produce how much compression
during a running (dynamic) compression test at idle? 60 to 90 psi
14. A smoothly operating engine depends on : equal
compression between cylinders
15. A vehicle's oil pressure warning light is on. Technician A says
that the pressure sending unit should be replaced and the
vehicle re-checked. Technician B says that a mechanical oil
pressure gauge should be used to check the oil pressure before
replacing the sending unit. Which technician is correct? Tech B
16. Which of the following is the LEAST LIKELY to cause an
engine noise? Vacuum leak
17. Two technicians are discussing oil leaks. Technician A says
that an oil leak can be found using a fluorescent dye in the oil
with a black light to check for leaks. Technician B says that a
white spray powder can be used to locate oil leaks. Who is
right? Both Techs
18. Technician A says that the first step in diagnosing engine
condition is to perform a thorough visual inspection. Technician
B says that oil leaks can be found by measuring straight up from
where the oil drips on the floor. Who is right? Tech A
19. A technician is performing a cylinder leak test. The leakage
on all cylinders is less than 10% on all cylinders except for one,
which indicates 80% leakage. What should the technician do?
Repeat the test (cylinder was not at T DC) 20. During a dry
compression test the first puff of the test shows 50 PSI and the
