Review fuel injection 1

What is the atmospheric pressure @ sea level ?

• 14.7 psi

• 101kPa

• 0

• 98kPa

If you are in British Columbia up in the mountains the oxygen is __________ and the PCM would increase or decrease fuel ?

• more + decrease

• less + increase

• less + decrease

• more + increase

Is a leak in the intake manifold going to _________ the vacuum measured ?

• increase

• decrease

• stay the same

• unstable reading

The PCM has to take into account to measure the exact quantity of oxygen; pressure,temperature and density of the air. Is cold air better than hot air ?

• No it is not

• A mixture is more efficient

• Yes it is

• It doesn't really matter in the process

In a port fuel injetion system where is the fuel injected ?

• In the combustion chamber

• Above the throttle plate

• Below the throttle plate

• In the low pressure side

What is the purpose of the fuel pressure regulator ?

• Ensure constant fuel flow

• Dampened fuel pulsation

• Maintain required pressure

• Holds residual pressure

• All of the above

Technician A says the fuel pump is usually controlled by the PCM. Technician B says that a TBI injector squirts fuel above the throttle plate. Which technician is correct ?

• Technician A only

• Technician B only

• Both technician A and B

• Neither Technician A or B

Why are some fuel rails rectangular in shape ?

• Increase fuel pressure

• Helps keep air out of the injectors

• Reduces noise

• Increases the speed of the fuel through the fuel rail

Dampeners are used on some fuel rails to _______ ?

• Increase the fuel pressure in the rail

• Reduce (decrease) the fuel pressure in the rail

• Reduce noise

• Trap dirt and keep it away from the injectors

The throttle plate is spring loaded to hold the throttle slightly open how far ?

Hint ; default position

• 3 to 5%

• 8 to 10%

• 16 to 20%

• 22 to 28%