Electronic Fuel Injection Systems Quiz

Define open loop/closed loop as it pertains to electronic fuel injection systems.

• Open loop uses feedback from sensors; closed loop does not.

• Open loop does not use feedback from sensors; closed loop does.

• Both open and closed loop use feedback from sensors.

• Neither open nor closed loop use feedback from sensors.

Where are the fuel injectors located in a TBI or throttle body injection system?

• In the exhaust manifold

• In the throttle body

• In the fuel tank

• In the air filter

In an eight-cylinder engine, how many injectors are usually present in a TBI system?

• 2

• 4

• 8

• 16

Explain the difference between direct and indirect injection.

• Direct injection sprays fuel into the intake manifold; indirect sprays into the combustion chamber.

• Direct injection sprays fuel into the combustion chamber; indirect sprays into the intake manifold.

• Both direct and indirect injection spray fuel into the combustion chamber.

• Both direct and indirect injection spray fuel into the intake manifold.

What is the sensor located in the exhaust for electronic fuel injection?

• Oxygen sensor

• Temperature sensor

• Pressure sensor

• Speed sensor

How does an electronic fuel injection system deliver more or less fuel?

• By changing the air filter

• By adjusting the fuel pump speed

• By altering the injector pulse width

• By modifying the exhaust system

Name a sensor used in an electronic fuel injection system.

• Light sensor

• Oxygen sensor

• Sound sensor

• Vibration sensor

Which of the following is NOT a sensor used in an electronic fuel injection system?

• Throttle position sensor

• Mass airflow sensor

• Light sensor

• Coolant temperature sensor

What does the throttle position sensor measure?

• Engine speed

• Throttle valve position

• Fuel level

• Exhaust temperature

Which sensor measures the amount of air entering the engine?

• Oxygen sensor

• Mass airflow sensor

• Coolant temperature sensor

• Throttle position sensor