Engine performance Exam 2 Questions and Answers Rated A

Engine performance Exam 2 Questions and Answers Rated A 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 A reluctor is a ________. Notched ring or pointed wheel 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 HEI and EIS are examples of ________. Distributor ignition systems Coil polarity is determined by the ________. Direction of rotation of the coil windings Because of ________, an ignition coil cannot be fully charged (reach magnetic saturation) until after a delay of about 10 ms. Inductive reactance The pulse generator ________ Signals the computer that fires the spark plug directly 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 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 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 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 Most ignition systems work by switching the circuit grounding the ignition coil's primary windings. True Which term describes the principle used to create high voltage from low voltage? Electromagnetic induction 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 Turning off the low voltage primary coil induces a high voltage in the secondary windings. True The primary coil windings are designed for higher current (2-6 Amperes). TrUe What is the name of the electronic component inside the ignition module that opens and closes the primary ignition circuit? Tansistor Which switching device uses a shutter blade and sensor to detect a magnetic field? Hall-effect switch Which switching device uses LEDs? Optical sensor 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 Which switching device creates its own electrical voltage pulse? Pickup coil How many ignition coils should you expect to find on a V6 engine using a waste spark system? Three 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 Coil-on-plug ignition systems have which of the following advantages over waste spark systems? Reduces electromagnetic interference The ________ sends a pulse signal to an electronic ignition module. Pickup coil Typical secondary coil resistance specifications usually range from ________ ohms. 6,000 to 30,000 Typical primary coil resistance specifications usually range from ________ ohms. 1 to 3 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 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 Testing an ignition coil for resistance will always indicate its condition. False Ignition systems may be disabled by removing the secondary wire from the ignition coil. FaLse Engine speed and position sensors only affect the ignition system. FALSE 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 Which of the following would cause carbon fouled spark plugs? Rich fuel mixture Which of the following could cause oil fouled spark plugs? Defective valve stem seals Which type of safety device will keep the electric fuel pump from operating if it is tripped? Inertia switch Fuel lines are constructed from ________. Seamless steel tubing Nylon plastic What prevents the fuel pump inside the fuel tank from catching the gasoline on fire? No air is around the motor brushes A good fuel pump should be able to supply how much fuel per minute? 0.6 to 0.8 gallons 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 Most fuel filters are designed to remove particles larger than ________. 20 microns 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 A fuel filter has been accidentally installed backwards. What is the most likely result? Lower power at higher engine speeds and loads 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 The fuel pickup tube is part of the filler tube assembly False tube assembly Inline fuel filters may be installed either direction False inline fuel filters What happens when fuel lines get too hot and only fuel vapors go through the fuel injectors? Vapor lock 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 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 Why are some fuel rails rectangular in shape? Reduces noise Which fuel-injection system uses the MAP sensor as the primary sensor to determine the base pulse width? Speed density 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 Which sensor has the greatest influence on injector pulse width besides the MAF sensor? TP 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 Which type of port fuel-injection system uses a fuel temperature and/or fuel-pressure sensor? Electronic returnless systems Dampeners are used on some fuel rails to ________. Reduce noise 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 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 Which term describes the PCM shutting off fuel injection when the accelerator is pressed all the way down? clear flood mode Which term describes the PCM using oxygen sensor feedback to control fuel delivery? Closed loop mode Where is the fuel injected in an engine equipped with gasoline direct injection? Directly into the combustion chamber The fuel pump inside the fuel tank on a vehicle equipped with gasoline direct injection produces about what fuel pressure? 50 to 60 psi The high pressure fuel pumps used in gasoline direct injection (GDI) systems are powered by ________. The camshaft The high pressure fuel pressure is regulated by using ________. An electric pressure control valve The fuel injectors on a GDI engine operate under a fuel pressure of about ________. 500 to 2,900 psi The fuel injectors used on a gasoline direct injection system are pulsed on using what voltage? 50 to 90 volts Some engines that use a gasoline direct injection system also have port injection. True gas direct injection A gasoline direct injection system can be used to start an engine without the need for a starter motor. True A lack of power from an engine equipped with gasoline direct injection could be due to ________. Noisy injectors Carbon on the intake valves When compared to conventional port fuel injection, a GDI equipped engine has a ________ compression ratio. higher At idle the injector pulse width of a GDI injector is about ________. 0.4 ms 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 A characteristic of GDI systems that could cause a customer concern is ________. The high fuel pressure causes the injectors to be noisy The high pressure fuel pump is cooled by ________. The fuel itself In a GDI engine the tank fuel pump delivers fuel to ________. High pressure pump