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unit 3 - electronic fuel injection - engine performance 1 With 100% SURE ANSWERS
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JACKLINEunit 3 - electronic fuel injection - engine performance 1 With 100% SURE ANSWERS
true the engine must be at normal operating temperature before the o2 sensor is tested?
Technician a says piezolectric injectors rely on stacked crystals that expand when voltage is
technician a applied. Technician b says that piezolectric injectors are slower acting than solenoid type
injectors, who is correct?
what could happen as a result of a leak in the fuel pressure regulator or the fuel pump check
hard starting
valve that allows the fuel pressure to slowly bleed down after engine shut down?
which of the following sensors is used to modify the engine's air/fuel mixture based on oxygen
o2 sensor
in the exhaust?
tech a says a pressure relief valve closes if the fuel supply line is restricted and pump pressure
becomes very high. tech b says the check valve in the pump prevents fuel from draining out of
both a and b
the fuel system and back into the fuel tank. This helps holds residual pressure in the fuel lines
after the pump is turned off. Who is correct?
Vacuum leaks in speed density systems can be o2 sensor cycle
unit
verified by watching 3 -onelectronic
the ____ a scan tool. fuel injection - engine performance 1
1/6
, 10/20/24, 1:50 PM
The fuel pressure regulator can be located on throttle body, inside fuel tank, and on the fuel rail
most heated oxygen sensors have how many 4 wires
wires connected to them
automatic transmission fluid which of the following should not be used to lubricate injector o-rings?
which of the following is not an operating mode idle mode
of a gdi engine?
While discussing PFI systems, Technician A says both a and b
the PCM provides the proper air/fuel ratio by
controlling the fuel pressure. Technician B says
the PCM provides the proper air/fuel ratio by
controlling the injector pulse width. Who is
correct?
other than inspecting the electrical connections, false
there are no physical checks to mass airflow or
manifold absolute pressure sensors
Preliminary checks are being discussed. a only
Technician a says to run specific fuel injection
tests first. Technician b says most driveabiity
concerns are caused by pcm related problems.
who is correct?
some vehicles have two fuel pumps, an in-tank true
pump and a second pump mounted under the
vehicle
which of the following is a typical fuel filter 30,000 miles
replacement interval?
when emptying a fuel tank, tech a drains the fuel b only
into plastic antifreeze containers then caps them
tightly to prevent leaks. tech b drains the fuel
into approved gasoline storage containers. who
is correct?
unit 3 - electronic fuel injection - engine performance 1
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