Question 1

Technician A says TBI systems use top fuel-feeding injectors. Technician B says PFI systems use bottom fuel-feeding injectors. Who is correct?

Accepted Answer

A)  A only
B)  B only
C)  both A and B
D)  neither A nor BE) B) and D)
F) A) and B)

Question 2

Technician A says pulsation dampers reduce the pressure pulsations caused by the rapid opening and closing of the fuel injectors. Technician B says the damper helps to reduce fuel noise and maintains pressure during engine cooldown. Who is correct?

Accepted Answer

A)  A only
B)  B only
C)  both A and B
D)  neither A nor BE) B) and C)
F) A) and B)

Question 3

The mass airflow (MAF)sensor measures changes in the intake manifold pressure that result from changes in engine load and speed.

Accepted Answer

A) True 
 B)False

Question 4

A speed-density EFI system computer determines the amount of air entering the engine from the ____________________ sensor and engine rpm input signals.

Accepted Answer

MAP,manifo...

Question 5

The ____________________ in a TBI system is designed to provide a constant pressure on the fuel injector throughout the range of engine loads and speeds.

Accepted Answer

The answer of The ____________________ in a TBI system is...

Question 6

The most important sensor in the fuel management system is _____.

Accepted Answer

A)  MAF (mass airflow) 
B)  MAP (manifold absolute pressure) 
C)  oxygen sensor
D)  CKP (crankshaft position sensor) E) A) and D)
F) A) and C)

Question 7

Technician A says the air/fuel ratio of a GDI (gasoline direct injection) engine can be as high as 60 to 1. Technician B says because the air/fuel ratios are so lean, GDI engines require lower compression ratios to prevent detonation. Who is correct?

Accepted Answer

A)  A only
B)  B only
C)  both A and B
D)  neither A nor BE) A) and C)
F) A) and B)

Question 8

The high-pressure fuel pump used in GDI ( gasoline direct injection)is driven by the ____________________.

Accepted Answer

The answer of The high-pressure fuel pump used in GDI...

Question 9

Which of the following is NOT a component of a throttle-by-wire system?

Accepted Answer

A)  accelerator pedal position sensor
B)  throttle position sensor
C)  throttle control motor
D)  IAC motor (idle air control) E) B) and D)
F) A) and B)

Question 10

Technician A says an SFI is more efficient than an MFI injection because fuel is injected only when the intake valve is open, so the fuel can't condense when the intake valve is closed. Technician B says an MFI injection system can shut down the injector for a misfiring cylinder, preventing catalytic converter overheating. Who is correct?

Accepted Answer

A)  A only
B)  B only
C)  both A and B
D)  neither A nor BE) B) and D)
F) A) and D)

Question 11

Today the most commonly used EFI system is the mass airflow (MAF)system which relies on a MAF sensor that directly measures the amount of intake air.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is NOT representative of sequential fuel injection systems?

Accepted Answer

A)  They have one injector per cylinder
B)  Injectors are located in the intake manifold ports
C)  All injectors receive the same PCM commands simultaneously
D)  None of the answers is correct.E) None of the above
F) C) and D)

Question 13

In TBI, MFI, and SFI systems, the fuel pressure must be high enough to prevent fuel ____________________.

Accepted Answer

boiling,va...

Exam 30: Electronic Fuel Injection

Technician A says TBI systems use top fuel-feeding injectors. Technician B says PFI systems use bottom fuel-feeding injectors. Who is correct?

Correct Answer
verified

Today the most commonly used EFI system is the mass airflow (MAF)system which relies on a MAF sensor that directly measures the amount of intake air.

Correct Answer
verified

A speed-density EFI system computer determines the amount of air entering the engine from the ____________________ sensor and engine rpm input signals.

Correct Answer
verified
MAP,manifo...
View Answer

Which of the following is NOT representative of sequential fuel injection systems?

Correct Answer
verified

Which of the following is NOT a component of a throttle-by-wire system?

Correct Answer
verified

The mass airflow (MAF)sensor measures changes in the intake manifold pressure that result from changes in engine load and speed.

Correct Answer
verified

The ____________________ in a TBI system is designed to provide a constant pressure on the fuel injector throughout the range of engine loads and speeds.

Correct Answer
verified

The most important sensor in the fuel management system is _____.

Correct Answer
verified

In TBI, MFI, and SFI systems, the fuel pressure must be high enough to prevent fuel ____________________.

Correct Answer
verified
boiling,va...
View Answer

Technician A says the air/fuel ratio of a GDI (gasoline direct injection) engine can be as high as 60 to 1. Technician B says because the air/fuel ratios are so lean, GDI engines require lower compression ratios to prevent detonation. Who is correct?

Correct Answer
verified

Correct Answer
verified

The high-pressure fuel pump used in GDI ( gasoline direct injection)is driven by the ____________________.

Correct Answer
verified

Technician A says pulsation dampers reduce the pressure pulsations caused by the rapid opening and closing of the fuel injectors. Technician B says the damper helps to reduce fuel noise and maintains pressure during engine cooldown. Who is correct?

Correct Answer
verified

Exam 30: Electronic Fuel Injection

Technician A says TBI systems use top fuel-feeding injectors. Technician B says PFI systems use bottom fuel-feeding injectors. Who is correct?

Correct AnswerverifiedShow Answer

Today the most commonly used EFI system is the mass airflow (MAF)system which relies on a MAF sensor that directly measures the amount of intake air.

Correct AnswerverifiedShow Answer

A speed-density EFI system computer determines the amount of air entering the engine from the ____________________ sensor and engine rpm input signals.

Correct AnswerverifiedMAP,manifo...View AnswerShow Answer

Which of the following is NOT representative of sequential fuel injection systems?

Correct AnswerverifiedShow Answer

Which of the following is NOT a component of a throttle-by-wire system?

Correct AnswerverifiedShow Answer

The mass airflow (MAF)sensor measures changes in the intake manifold pressure that result from changes in engine load and speed.

Correct AnswerverifiedShow Answer

The ____________________ in a TBI system is designed to provide a constant pressure on the fuel injector throughout the range of engine loads and speeds.

Correct AnswerverifiedShow Answer

The most important sensor in the fuel management system is _____.

Correct AnswerverifiedShow Answer

In TBI, MFI, and SFI systems, the fuel pressure must be high enough to prevent fuel ____________________.

Correct Answerverifiedboiling,va...View AnswerShow Answer

Technician A says the air/fuel ratio of a GDI (gasoline direct injection) engine can be as high as 60 to 1. Technician B says because the air/fuel ratios are so lean, GDI engines require lower compression ratios to prevent detonation. Who is correct?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The high-pressure fuel pump used in GDI ( gasoline direct injection)is driven by the ____________________.

Correct AnswerverifiedShow Answer

Technician A says pulsation dampers reduce the pressure pulsations caused by the rapid opening and closing of the fuel injectors. Technician B says the damper helps to reduce fuel noise and maintains pressure during engine cooldown. Who is correct?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
MAP,manifo...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
boiling,va...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified