Engine Performance II Final Practice
Exam Questions & Answers (Grade
A+)
While discussing electronic fuel injection principles, Technician A
says the speed-density management strategy uses modifiers to
achieve a base pulse width of the fuel injectors. Technician B says
the computer uses the TPS and oxygen sensor signals to determine
the air entering the engine in a speed-density system. Who is
correct? -
correct answer ✅A only.
While discussing port fuel injection systems. Technician A says that
in a port fuel injection system, higher-than-normal fuel pressure
causes a lean air-fuel ratio. Technician B says that in a port fuel
injection system, lower-than normal fuel pressure causes a rich air-
fuel ratio. Who is correct? -
correct answer ✅Neither A nor B.
While discussing TBI, MFI, and SFI systems, Technician A says that
PCM provides the proper air-fuel ratio by controlling fuel pressure.
Technician B says the PCM provides the proper air-fuel ratio by
controlling injector pulse width. Who is correct? -
correct answer ✅B only.
, Engine Performance II Final Practice
Exam Questions & Answers (Grade
A+)
All the following are advantages of gasoline direct fuel injection
systems except: -
correct answer ✅More complex software program.
While discussing fuel pressure regulators, Technician A says that the
pressure regulator in a port fuel injection system maintains the
same fuel pressure regardless of throttle opening. Technician B says
that the manifold vacuum connection to the pressure regulator in a
return port fuel injection system causes higher fuel pressure at
wide-open throttle. Who is correct? -
correct answer ✅B only.
While discussing return-less fuel systems, Technician A says in a
return-less fuel system, the pressure regulator is mounted on the
fuel rail. Technician B says in return-less fuel systems, the filter is
integrated into the fuel tank sending unit assembly. Who is correct?
-
correct answer ✅B only.
While discussing fuel boiling in the fuel rail, Technician A says that if
fuel boils in the fuel rail this will causes a lean air-fuel ratio.
Technician B says that a minimum fuel pressure is maintained in the
Exam Questions & Answers (Grade
A+)
While discussing electronic fuel injection principles, Technician A
says the speed-density management strategy uses modifiers to
achieve a base pulse width of the fuel injectors. Technician B says
the computer uses the TPS and oxygen sensor signals to determine
the air entering the engine in a speed-density system. Who is
correct? -
correct answer ✅A only.
While discussing port fuel injection systems. Technician A says that
in a port fuel injection system, higher-than-normal fuel pressure
causes a lean air-fuel ratio. Technician B says that in a port fuel
injection system, lower-than normal fuel pressure causes a rich air-
fuel ratio. Who is correct? -
correct answer ✅Neither A nor B.
While discussing TBI, MFI, and SFI systems, Technician A says that
PCM provides the proper air-fuel ratio by controlling fuel pressure.
Technician B says the PCM provides the proper air-fuel ratio by
controlling injector pulse width. Who is correct? -
correct answer ✅B only.
, Engine Performance II Final Practice
Exam Questions & Answers (Grade
A+)
All the following are advantages of gasoline direct fuel injection
systems except: -
correct answer ✅More complex software program.
While discussing fuel pressure regulators, Technician A says that the
pressure regulator in a port fuel injection system maintains the
same fuel pressure regardless of throttle opening. Technician B says
that the manifold vacuum connection to the pressure regulator in a
return port fuel injection system causes higher fuel pressure at
wide-open throttle. Who is correct? -
correct answer ✅B only.
While discussing return-less fuel systems, Technician A says in a
return-less fuel system, the pressure regulator is mounted on the
fuel rail. Technician B says in return-less fuel systems, the filter is
integrated into the fuel tank sending unit assembly. Who is correct?
-
correct answer ✅B only.
While discussing fuel boiling in the fuel rail, Technician A says that if
fuel boils in the fuel rail this will causes a lean air-fuel ratio.
Technician B says that a minimum fuel pressure is maintained in the
