Engine Performance 2 Final
GDI fuel injectors operate under a pressure of about _______.
500 to 2,900 PSI
The first fuel filter in teh sock inside the fuel tank normally filters particles larger than _________.
70 to 100 microns
A waste-spark-type ignition system fires _________.
All of the above
On a vehicle with a speed density fuel injection system, which of the following is likely to occur with a vacuum leak?
All of these are correct
Which of these are symptoms of carbon build-up on the throttle plates?
All of these are correct
The throttle body may be cleaned (if recommended by the vehicle manufacturer) if what conditions are occurring?
Any of the above
Fuel injectors can be tested using _______.
Any of these
An ion-sensing ignition system has the ability to detect _________.
Both A and B
Fuel lines are constructed from _______.
Both A and B
All electronic throttle control system includes the following components EXCEPT _________.
Idle control switch
If it is tripped, which type of safety device will keep the electric fuel pump from operating?
Inertia switch
A fuel filter has been accidentally installed backwards. What is the most likely result?
Lower power at higher engine speeds and loads
Which of these tools is needed when diagnosing an electronic throttle system?
Scan tool
Which fuel injection system uses the MAP sensor as the primary sensor to determine the base pulse width?
Speed density
The throttle body may need cleaning if which of the following occurs?
Stall at idle speed
Which term is used to describe a TBI system where the injector pulses once per each distributor reference pulse?
Synchronized
Which sensor has the greatest influence on injector pulse width besides the MAF sensor?
TP
The electric fuel pump is usually mounted in which of these locations?
Fuel tank
A good fuel pump should supply how much fuel per minute?
0.5 to 0.8 gallons
Most fuel filters are designed to remove particles larger than ______.
10 to 20 microns
The SIDI high pressure fuel pump uses a single-barrel piston plunger that is driven by _______.
A three-lobed cam
The use of an electronic throttle control (ETC) system allows the elimination of all of these EXCEPT _________.
Accelerator pedal
How much voltage is generally available to fuel injectors?
Battery voltage
A lack of power from an engine equipped with gasoline direct injection could be due to ________.
Both B and C
Two technicians are discussing coil-on-plug ignition systems. Technician A says that they can be called coil-near-plug or coil-by- plug ignition systems. Technician B says that some can use ion sensing. Which technician is correct?
Both Technicians
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?
Both technician
Fuel injection service is being discussed. Technician A says that the throttle plate(s) should be cleaned. Technician B says that the fuel rail should be cleaned. Which technician is correct?
Both technicians
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?
Both technicians
Technician A says that inductive ignition systems supply battery voltage to the positive side of the ignition coil and pulse the negative side of the coil on and off to ground to create a high-voltage spark. Technician B says if an ignition system uses a distributor, it is called a DI system. Which technician is correct?
Both technicians
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?
Both technicians
Technician A says that the fuel system should be diagnosed first in a no-start condition. Technician B says that the ignition system trigger device is used to synchronize fuel injection. Which technician is correct?
Both technicians
Tenician A says that an engine benefited from system cleaning if the manifold vacuum at idle increases. Technician B says that cleaning the throttle plate and IAC passages will benefit many engines. Which technician is correct?
Both technicians
Which statement is correct?
Dirt is most likely to be found near the bottom of the fuel tank
All of the following statements are correct EXCEPT:
Fuel injectors on a gang fire system are wired in series
The vacuum hose from the fuel-pressure regulator was removed from the regulator and gasoline dripped out of the hose. Technician A says that this is normal and that everything is okay. Technician B says that one or more of the injectors may be defective, causing the fuel to get into the hose. Which technician is correct?
Neither technician
Fuel pump pressure is too low after engine start-up. Which of these could be the cause?
Plugged fuel filter
Why are some fuel rails rectangular in shape?
Reduces noise
An injection cleaning machine is being discussed. Technician A says that the applied pressure should be between 75-90 PSI before starting the engine. Technician B says to pressure clean the fuel system using a 2:1 mixture of solvent to gasoline. Which technician is correct?
Technician A only
Technician A says that a thorough visual inspection should be performed on all ignition components when diagnosing an engine performance problem. Technician B says platinum spark plugs can be regapped after use in an engine. Which technician is correct?
Technician A only
Technician A says that fuel tank accident and rollover protection devices include check valves and inertia switches. Technician B says that most fuel lines are made of ABS plastic. Which technician is correct?
Technician A only
Technician A says that vacuum-operated fuel pressure regulators allow an equal pressure drop drop across the fuel injectors all the time. Technician B says that intake manifold pressure is high at idle. Which technician is correct?
Technician A only
When the ignition is first turned on a click noise is heard from under the hood of a vehicle equipped with ETC. Technician A says that this is the normal operation of the ETC self-test. Technician B Says that the TAC motor should not move unless the engine is running. Which Technician is correct?
Technician A only
Technician A says that a fuel tank is either constructed of steel with brass plating for corrosion resistance or of polyethylene plastic. Technician B says that some fuel tank filler tubes contain an anti-siphoning device. Which technician is correct?
Technician B only
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 B only
Technician A says that if fuel pump pressure is correct, fuel pump volume will be correct as well. Technician B says that a fuel pump may produce specified pressure but below specified volume. Which technician is correct?
Technician B only
Technician A says that the port fuel injectors operate using five volts from the computer. Technician B says that sequential fuel injectors all use a different wire color on the injectors. Which technician is correct?
Technician B only
The high-pressure fuel pump used in gasoline direct injection (GDI) systems is powered by ________.
The camshaft
Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines?
The create an equal pressure drop across the injectors
After servicing the air filter on an ETC equipped vehicle, the technician has forgotten to connect the throttle motor wiring. What will happen when the vehicle is started?
The engine will start but not accelerate; idle speed between 1200 and 1600 RPM
A gasoline direct injection system can be used to start an engine without the need for a starter.
True
