AET239 (1-11) Final Review Exam And Answers Already Passed.
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Course
Fire and Smoke Damage Restoration Technician
Institution
Fire And Smoke Damage Restoration Technician
Technician A says when attempting to locate an engine performance problem, you should observe the engine's exhaust smoke. Technician B says when attempting to locate an engine performance problem, you should listen for any abnormal engine noises. Who is right? - Answer Both A & B
An engine is...
AET239 (1-11) Final Review Exam And
Answers Already Passed.
Technician A says when attempting to locate an engine performance problem, you should observe the
engine's exhaust smoke. Technician B says when attempting to locate an engine performance problem,
you should listen for any abnormal engine noises. Who is right? - Answer Both A & B
An engine is brought into the shop with a misfire problem. Technician A says to use a scan tool to find
out which cylinders are misfiring. Technician B says to suspect the spark plug ignition coil, and the high
voltage conductor before checking cylinder compression. Who is right? - Answer Both A & B
All of the following may cause an engine to surge except: - Answer Starter Solenoid Problem
Define the term misfiring. - Answer A performance problem resulting from one or more cylinders
failing to fire normally or at all.
Technician A says engine hesitation is normally caused by a temporarily rich air-fuel mixture. Technician
B says engine hesitation is usually caused by a temporarily lean air-fuel mixture. Who is right? - Answer
B Only
How do you use a systematic approach to troubleshooting? - Answer Using your knowledge of
automotive systems and a logical process of elimination to find the source of a problem.
A(n) _______ is a condition where the engine does not accelerate normally when the gas pedal is
pressed. - Answer Hesitation
What causes "backfiring?" - Answer Air-fuel mixture igniting in the intake manifold or the exhaust
system.
Define the term dieseling. - Answer Occurs when the engine fails to shut off.
All of the following are common engine performance problems except: - Answer Oil Leak
,If you have difficulty locating an engine performance problem, refer to a factory _________, which lists
problem causes and corrections. - Answer Diagnosis Chart
An automobile engine has a misfire problem. Technician A says type A misfires are severe enough to
cause catalytic converter damage. Technician B says that "rpm at misfire" and "load at misfire" are
misfire data produced by a scan tool when connected to the OBD II diagnostic link. Who is right? -
Answer Both A & B
A car is towed into a shop with a no-start problem. The engine cranks but will not fire and run on its own
power. The car has a throttle body, fuel injected gasoline engine. Technician A says to check for spark and
fuel first. Technician B says that the spark plugs should be removed first. Who is right? - Answer A Only
A car has a hard starting problem. Technician A says the engine may have a faulty throttle position
sensor. Technician B says this engine malfunction may be caused by a faulty coolant temperature sensor.
Who is right? - Answer Both A & B
A vacuum leak is detected in an automotive engine. Technician A says the leak will produce a banging
sound at low engine rpms. Technician B says an intake manifold vacuum leak will make the engine run
rough and increase idle rmps. Who is right? - Answer B Only
An automotive engine has a no-start problem. Technician A says this condition may indicate an ignition
system malfunction. Technician B says this problem may indicate a fuel system problem. Who is right? -
Answer Both A & B
An automotive engine has a stalling problem. Technician A says this problem may be due to a low idle
speed setting. Technician B says this problem may be due to a severe engine vacuum leak. Who is right? -
Answer Both A & B
An automotive engine won't start. Technician A says you should first look in the engine compartment for
obvious signs of trouble. Technician B says an exhaust gas analyzer should be used first to diagnose the
engine problem. Who is right? - Answer A Only
A(n) _______ or ________ is a metallic tapping or light knocking sound that usually occurs when the
engine accelerates under load. - Answer Pinging; Spark Knock
,Vapor lock occurs when the gasoline is cooled and forms a gel, preventing fuel flow and engine
operation. - Answer False
A vacuum leak is a common cause of rough idling. - Answer True
Technician A says stalling may occur while the engine is idling. Technician B says stalling may occur after
cold starting. Who is right? - Answer Both A & B
An engine is brought into the shop with a dieseling problem. Technician A says this may be caused by a
high octane fuel. Technician B says this may be the result of an overheated engine. Who is right? -
Answer B Only
An engine has poor fuel economy. Technician A says this problem may be the result of a leaky fuel line.
Technician B says this problem may be caused by a rich air-fuel mixture. Who is right? - Answer Both A
&B
A fuel injected engine misses and emits heavy black smoke. Technician A says this problem normally
indicates an emission control system malfunction. Technician B says this problem may indicate a faulty
engine temperature sensor. Who is right? - Answer B Only
A car has a low brake pedal problem. Technician A inspects the brake adjusters. Technician B looks for a
maladjusted master cylinder push rod. Who is right? - Answer Both A & B
An automobile has a metal-on-metal grinding sound when the brakes are applied. Technician A inspects
the brake linings. Technician B looks for a leaking wheel cylinder. Who is right? - Answer A Only
An automobile has a spongy brake pedal. Technician A checks to see if the brake pad linings are too thin
compared to specs. Technician B bleeds the brake system. Who is right? - Answer B Only
Brake dust has accumulated on an automobile's wheel brake assemblies. Technician A uses a brake
vacuum machine to remove this dust. Technician B uses compressed air to remove this dust. Who is
right? - Answer A Only
, Cleaning hydraulic brake system parts in cold soak solvent is recommended. - Answer False
What are the three methods for bleeding a vehicle brake system? - Answer Manual, Pressure, Vacuum
How much fluid should typically be in a master cylinder? - Answer Brake Fluid Level Should Be 1/4"(6m)
from the top of the reservoir
Technician A says a scan tool will usually test the action of major ABS components by energizing them.
Technician B says that a scan tool does not have this capability. Who is correct? - Answer A Only
Technician A says that you must set the sensor air gap on some vehicles. Technician B says that the air
gap between the sensor and trigger wheel needs to be increased each year the vehicle is in service. Who
is correct? - Answer A Only
A scan tool shows a problem with the modulator pump motor. Technician A says to check for power to
the motor from the ABS control module. Technician B says if no power is reaching the motor to check the
wiring between the control module and the motor. Who is correct? - Answer Both A & B
Which of the following cannot be checked with a scan tool? - Answer Break Lining Condition
The wheel speed sensors produce ac _____ that correspond to wheel and tire speed. - Answer Signals
In addition to the brake warning light in the instrument cluster and the sensor trigger wheels, list and
describe the four major parts of an anti-lock brake system. - Answer Wheel speed sensors, an ABS
control module, an electro-hydraulic brake actuator, and conventional hydraulic brake circuits. Evaluate
descriptions individually.
A(n) _____ system prevents wheel lockup during hard braking. - Answer Anti-Lock Brake
Technician A says heat always transfers from a hotter object to a colder object. Technician B says heat
always transfers from a colder object to a hotter object. Who is right? - Answer A Only
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