Exam 22: Fuel-Injection Components and Operation

Technician A says that fuel pressure regulators are often located on the return side of the fuel rail. Technician B says that the fuel pressure regulator is located at the fuel tank on vehicles using mechanical returnless systems. Which technician is correct?

All these methods can calculate airflow EXCEPT ________.

A sequential fuel injection system uses a ________ to time the fuel injection pulses.

Which sensor is used to calculate the amount of fuel required using the speed density method?

Technician A says that all injectors in a sequential fuel injection system often use the same power wire. Technician B says that each injector in a sequential fuel injection system should have a different ground wire. Which technician is correct?

Technician A says that all port fuel injected systems use the speed density method. Technician B says that throttle body injection systems use the speed density method. Which technician is correct?

Technician A says that an idle air control valve controls the airflow past the fuel injectors. Technician B says that the idle air control valve is usually controlled by a stepper motor. Which technician is correct?

Which term describes the PCM using oxygen sensor feedback to control fuel delivery?

Which of these describes a condition that results in more fuel being delivered?

Which term is used to describe pulses of air flowing from the engine out the air intake due to the time interval between intake events with a four-cylinder engine?

The fuel injector in a central port fuel injection system is called a(an) ________.

The injectors on an EFI equipped engine are opened using ________ to lift the spray needle.

Technician A says that vehicles with electronic returnless fuel systems use pulse width modulation to power the fuel pump and maintain fuel pressure. Technician B says that the electronic returnless fuel system uses a contact switch to control the fuel pump. Which technician is correct?

Technician A says that most fuel injection systems use the PCM to control the pulsing of the fuel injectors. Technician B says that most fuel injection systems use the PCM to control the operation of the fuel pump relay. Which technician is correct?

Which type of port fuel injection groups the injectors into two groups, with each group firing once per crankshaft revolution?

Which term describes the PCM shutting off fuel injection when the accelerator is pressed all the way down?

All of the following statements are correct EXCEPT ________.

Which of these is true regarding port fuel injection systems?

Which type of port fuel injection allows mixture adjustments between the firing of each cylinder?

Which statement is correct?