Engine performance Exam 2

Because of ________, an ignition coil cannot be fully charged (reach magnetic saturation) until after a delay of about 10 ms.

Inductive reactance

Which type of safety device will keep the electric fuel pump from operating if it is tripped?

Inertia switch

Most fuel filters are designed to remove particles larger than ________.

20 microns

Testing an ignition coil for resistance will always indicate its condition.

False

The high pressure fuel pressure is regulated by using ________.

An electric pressure control valve

Where is the fuel-pressure regulator located on a vacuum-biased port fuel-injection system?

At the outlet of the fuel rail

Technician A says that fuel tanks on 1993 and later vehicles use a check ball to prevent siphoning gasoline through the filler neck. Technician B says that methanol is considered a poison. Which technician is correct?

Both 1993

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 Techs PCM

Technician A says low power on acceleration is a symptom of a restricted fuel filter. Technician B says loss of high speed engine performance is a symptom of a restricted fuel filter. Which technician is correct?

Both restricted fuel filter

Technician A says that a defective crankshaft position sensor can cause a no-spark condition. Technician B says that a faulty ignition control module can cause a no-spark condition. Which technician is correct?

Both tech no-spark condtion

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

Closed loop mode

Which of the following could cause oil fouled spark plugs?

Defective valve stem seals

An ion-sensing ignition system allows the ignition system itself to be able to ________.

Detect rich or lean air-fuel mixture Detect spark knock Detect misfire

Coil polarity is determined by the ________.

Direction of rotation of the coil windings

Where is the fuel injected in an engine equipped with gasoline direct injection?

Directly into the combustion chamber

HEI and EIS are examples of ________.

Distributor ignition systems

Which term describes the principle used to create high voltage from low voltage?

Electromagnetic induction

Which type of port fuel-injection system uses a fuel temperature and/or fuel-pressure sensor?

Electronic returnless systems

Engine speed and position sensors only affect the ignition system.

FALSE

Ignition systems may be disabled by removing the secondary wire from the ignition coil.

FaLse

Inline fuel filters may be installed either direction

False inline fuel filters

The fuel pickup tube is part of the filler tube assembly

False tube assembly

A waste-spark-type ignition system ________.

Fires one spark lug with reverse polarity Fires one spark plug with straight polarity Fires two spark plugs at the same time

Which switching device uses a shutter blade and sensor to detect a magnetic field?

Hall-effect switch

In a GDI engine the tank fuel pump delivers fuel to ________.

High pressure pump

What prevents the fuel pump inside the fuel tank from catching the gasoline on fire?

No air is around the motor brushes

How many ignition coils should you expect to find on a V6 engine using a waste spark system?

Three

Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines?

To create an equal pressure drop across the injectors

The primary coil windings are designed for higher current (2-6 Amperes).

TrUe

A gasoline direct injection system can be used to start an engine without the need for a starter motor.

True

Most ignition systems work by switching the circuit grounding the ignition coil's primary windings.

True

Turning off the low voltage primary coil induces a high voltage in the secondary windings.

True

Some engines that use a gasoline direct injection system also have port injection.

True gas direct injection

On a most cars how long will the fuel pump run if the ignition is turned on but the engine is not started?

Two seconds

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

clear flood mode

When compared to conventional port fuel injection, a GDI equipped engine has a ________ compression ratio.

higher

The fuel injectors used on a gasoline direct injection system are pulsed on using what voltage?

50 to 90 volts

The fuel injectors on a GDI engine operate under a fuel pressure of about ________.

500 to 2,900 psi

Typical secondary coil resistance specifications usually range from ________ ohms.

6,000 to 30,000

At idle the injector pulse width of a GDI injector is about ________.

0.4 ms

A good fuel pump should be able to supply how much fuel per minute?

0.6 to 0.8 gallons

Typical primary coil resistance specifications usually range from ________ ohms.

1 to 3

The fuel pump inside the fuel tank on a vehicle equipped with gasoline direct injection produces about what fuel pressure?

50 to 60 psi

Two technicians are discussing distributor ignition. Technician A says that the pickup coil or optical sensor in the distributor is used to pulse the ignition module (igniter). Technician B says that some distributor ignition systems have the ignition coil inside the distributor cap. Which technician is correct?

Both tech distributor ignition

Technician A says that platinum tipped spark plugs should never be re-gapped after using in a running engine. Technician B says that spark plugs should not be removed from a hot cylinder head. Which technician is correct?

Both tech pltinum tips

Technician A says that ignition timing cannot be adjusted on waste spark ignition systems. Technician B says that most waste spark systems use a crankshaft position sensor. Which technician is correct?

Both techs waste spark

A fuel filter has been accidentally installed backwards. What is the most likely result?

Lower power at higher engine speeds and loads

Technician A looks for engine speed (RPM) when cranking an engine that will not start. Technician B says that a problem in the primary circuit could make the tachometer not work. Which technician is correct?

Neither Tech tachometer

A lack of power from an engine equipped with gasoline direct injection could be due to ________.

Noisy injectors Carbon on the intake valves

A reluctor is a ________.

Notched ring or pointed wheel

Which switching device uses LEDs?

Optical sensor

The ignition module has direct control over the firing of the coil(s) of an EI system. Which component(s) triggers (controls) the module?

Pick up coil

The ________ sends a pulse signal to an electronic ignition module.

Pickup coil

Which switching device creates its own electrical voltage pulse?

Pickup coil

Dampeners are used on some fuel rails to ________.

Reduce noise

Coil-on-plug ignition systems have which of the following advantages over waste spark systems?

Reduces electromagnetic interference

Why are some fuel rails rectangular in shape?

Reduces noise

Which of the following would cause carbon fouled spark plugs?

Rich fuel mixture

Fuel lines are constructed from ________.

Seamless steel tubing Nylon plastic

The pulse generator ________

Signals the computer that fires the spark plug directly

The primary (low-voltage) ignition system must be working correctly before any spark occurs from a coil. Which component is NOT in the primary ignition circuit?

Spark plug wiring

Which fuel-injection system uses the MAP sensor as the primary sensor to determine the base pulse width?

Speed density

Which sensor has the greatest influence on injector pulse width besides the MAF sensor?

TP

What is the name of the electronic component inside the ignition module that opens and closes the primary ignition circuit?

Tansistor

Technician A says to check for spark from the ignition coil first when diagnosing a no-start condition. Technician B says to check the engine CAM sensor first to diagnose a no-spark condition. Which technician is correct?

Tech A no-start condition

A fuel pump is being replaced for the third time. Technician A says that the gasoline could be contaminated. Technician B says that wiring to the pump could be corroded. Which technician is correct?

Tech B Fuel pump replacement

Technician A says that the port fuel injection 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?

Tech B Injectors

Technician A says that the primary and secondary ignition systems are never connected. Technician B says that the primary and secondary windings are connected in some ignition coils. Which technician is correct?

Tech B ignition coils

Technician A says that the primary coil has more windings. Technician B says that the secondary coil has more windings. Which technician is correct?

Tech B secondary had more coils

Technician A says to use a normal spark plug when checking for spark. Technician B says that a spark tester should be used to check for spark. Which technician is correct?

Tech B spark tester

Technician A says that fuel pump modules are spring-loaded so that they can be compressed to fit into the opening. Technician B says that they are spring-loaded to allow for expansion and contraction of plastic fuel tanks. Which technician is correct?

Tech B spring-loaded

Technician A says that the cylinder head and piston design of a GDI engine is the same as in a port injected engine. Technician B says that a GDI engine uses specially shaped pistons. Which technician is correct?

Tech be GDI engines

The high pressure fuel pumps used in gasoline direct injection (GDI) systems are powered by ________.

The camshaft

The high pressure fuel pump is cooled by ________.

The fuel itself

A characteristic of GDI systems that could cause a customer concern is ________.

The high fuel pressure causes the injectors to be noisy

What happens when fuel lines get too hot and only fuel vapors go through the fuel injectors?

Vapor lock