Engine Performance Final Final UPDATED
ACTUAL Questions and CORRECT
Answers
The acceptable amount of alcohol mixed with gasoline (non E-85) is: - CORRECT ANSWER - Up
to 10 percent.
When the pressure in the intake manifold increases, the fuel pressure regulator on a port fuel injection
system: - CORRECT ANSWER - Increases fuel pressure.
Technician A says to relieve pressure on an PFI (port fuel injection) system, a pressure gauge may be
connected to the fuel pressure test port and the bleed (pressure relief) valve on the gauge opened with the
bleed hose installed in an approved container.
Technician B says before fuel system components on an PFI system can be removed, the fuel system
pressure must be relieved. - CORRECT ANSWER - Both A and B
Technician A says fuel that has low volatility can cause a buildup of deposits in the combustion chamber.
Technician B says liquid gasoline will not burn. - CORRECT ANSWER - Both A and B
Technician A says a fuel rail holds all the injectors on a PFI equipped engines.
Technician B says a PFI fuel injection system sprays fuel into the intake port near the intake valve. -
CORRECT ANSWER - Both A and B
Technician A says the fuel rail delivers fuel to the fuel injectors.
Technician B says the throttle body in a port fuel injection system controls the amount of fuel entering the
engine. - CORRECT ANSWER - Technician A
, The fuel pressure regulator in return-type fuel systems is located: - CORRECT ANSWER - At the
outlet of the fuel rail.
Technician A says a rich air-fuel mixture may be the result of higher-than-normal fuel pressure.
Technician B says higher-than-normal fuel pressure causes a lean air-fuel ratio. - CORRECT
ANSWER - Technician A
Higher-than-normal fuel pressure may be caused by: - CORRECT ANSWER - Both A and B
A defective fuel pressure regulator.
A fuel return line that is restricted.
Technician A says lower than normal fuel pressure may be caused by a restricted fuel filter.
Technician B says when testing fuel pressure make sure the specifications are either for the engine
running or the engine off.
Who is correct? - CORRECT ANSWER - Both A and B
Technician A says the powertrain control module (PCM) provides the proper air-fuel ratio by controlling
injector pulse width.
Technician B says the powertrain control module (PCM) controls the fuel pressure to provide the proper
air-fuel ratio. - CORRECT ANSWER - Technician A
With direct fuel injection (DFI), the gasoline is injected: - CORRECT ANSWER - Into the
combustion chamber.
Octane is use to reduce: - CORRECT ANSWER - Detonation.
ACTUAL Questions and CORRECT
Answers
The acceptable amount of alcohol mixed with gasoline (non E-85) is: - CORRECT ANSWER - Up
to 10 percent.
When the pressure in the intake manifold increases, the fuel pressure regulator on a port fuel injection
system: - CORRECT ANSWER - Increases fuel pressure.
Technician A says to relieve pressure on an PFI (port fuel injection) system, a pressure gauge may be
connected to the fuel pressure test port and the bleed (pressure relief) valve on the gauge opened with the
bleed hose installed in an approved container.
Technician B says before fuel system components on an PFI system can be removed, the fuel system
pressure must be relieved. - CORRECT ANSWER - Both A and B
Technician A says fuel that has low volatility can cause a buildup of deposits in the combustion chamber.
Technician B says liquid gasoline will not burn. - CORRECT ANSWER - Both A and B
Technician A says a fuel rail holds all the injectors on a PFI equipped engines.
Technician B says a PFI fuel injection system sprays fuel into the intake port near the intake valve. -
CORRECT ANSWER - Both A and B
Technician A says the fuel rail delivers fuel to the fuel injectors.
Technician B says the throttle body in a port fuel injection system controls the amount of fuel entering the
engine. - CORRECT ANSWER - Technician A
, The fuel pressure regulator in return-type fuel systems is located: - CORRECT ANSWER - At the
outlet of the fuel rail.
Technician A says a rich air-fuel mixture may be the result of higher-than-normal fuel pressure.
Technician B says higher-than-normal fuel pressure causes a lean air-fuel ratio. - CORRECT
ANSWER - Technician A
Higher-than-normal fuel pressure may be caused by: - CORRECT ANSWER - Both A and B
A defective fuel pressure regulator.
A fuel return line that is restricted.
Technician A says lower than normal fuel pressure may be caused by a restricted fuel filter.
Technician B says when testing fuel pressure make sure the specifications are either for the engine
running or the engine off.
Who is correct? - CORRECT ANSWER - Both A and B
Technician A says the powertrain control module (PCM) provides the proper air-fuel ratio by controlling
injector pulse width.
Technician B says the powertrain control module (PCM) controls the fuel pressure to provide the proper
air-fuel ratio. - CORRECT ANSWER - Technician A
With direct fuel injection (DFI), the gasoline is injected: - CORRECT ANSWER - Into the
combustion chamber.
Octane is use to reduce: - CORRECT ANSWER - Detonation.
