Exam (elaborations)
SOS Mechanic Certificate -Engine Tune-up/Performance
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SOS Mechanic Certificate -EngineTune-up/Performance
The engine vacuum is low but consistent, indicating retarded timing.
The Purpose of a Catalytic Converter - ANSWER oxidize HCCO into CO2 and
H20
What vehicles are designed to enter a closed loop operation when: ANSWER: All
of the aforementioned.
The diagram depicts a vacuum hose attached to "p vacuum"; this indicates that the
hose should be connected above the throttle plate.
If the voltage spike on one cylinder is insufficient, what is the most likely cause of
the problem? - ANSWER: A faulty spark plug
The power train control module reverts to an open loop with rich mixtures when
wide-open-throttle is applied.
During a cylinder leakage test, air escaping via the throttle body indicates a leak at
the - ANSWER intake valve.
Higher than average oxides of nitrogen (NOx) emissions may be caused by -
ANSWER all of the above.
A reading of 8 volts on meter 2 while cranking would indicate—ANSWER an
excessive ground circuit voltage loss.
, Emission control systems are put on engines to minimize what three specific
exhaust products? Hydrocarbon, carbon monoxide, and nitrogen oxides
You have validated a slow-cranking complaint; what should you do next?
ANSWER Determine the state of the battery.
The EGR System is meant to cruise.
You are monitoring the TPS signed voltage digital volt-ohm - ANSWER. A steady
voltage increases to approximately 4.5 volts.
A throttle body injection system is an electronic fuel injection system that sprays
fuel into the intake throat.
What is the function of the EGR valve? ANSWER: It recalculates exhaust gases
into the intake.
A customer presents their vehicle to you with a concern about low power -
ANSWER all of the above.
ANSWER: A reading of 1 volt on meter number 1 cranking Does acceptable
voltage drop
You are testing the 02 during closed loop 450 to 500. ANSWER: The sensor is
sluggish and probably bad.
ANSWER: A car with dis will not start. A malfunctioning or misaligned crank
sensor.
How is fuel pressure controlled in an electric EFL? - ANSWER Engine vacuum
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