pre test no studying
The typical amount of secondary coil voltage required to jump the spark plug gap is ____ volts.
10,000 volts
Spark plug firing voltage should normally be ______. 7 to 13 kV less than 3 kV 3 to 13 kV none of these answers is correct
7 to 13kv
Which of the following statements about carbon tracking is NOT correct? Carbon tracking may occur inside a distributor cap Carbon tracking indicates that high voltage has followed a low-resistance conductive path Carbon tracking may cause a misfire Carbon tracking usually occurs in the primary ignition circuit
Carbon tracking usually occurs in the primary ignition circuit
Which of the following chemicals is NOT a pollutant? carbon monoxide [CO] oxides of nitrogen [NOx] nitrogen [N2] hydrocarbons [HC]
N2 nitrogen
Data collected by system sensors is stored in _____ memory. RAM nonvolatile RAM ROM PROM
RAM
Which of the following is a component of the secondary ignition circuit? battery ignition switch PCM spark plug
SPARK plug
A phaser is used to _____. advance or retard camshaft timing measure crankshaft position advance or retard ignition timing kill Klingons
advance or retard camshaft timing
Ignition spark typically occurs a few degrees _______. before top dead center [BTDC] after top dead center [ATDC] before bottom dead center [BBDC] after bottom dead center [ABDC]
before top dead center
Ignition timing is being discussed. Technician A says when the engine idle speed moves away from the desired idle speed, the PCM will adjust the timing to stabilize the engine speed. Technician B says when a knock is detected, the PCM retards the timing in fixed steps until the knock disappears. Who is correct?
both
In EI systems using one ignition coil for every two cylinders, Technician A says two plugs fire at the same time, with one wasting the spark on the exhaust stroke. Technician B says one plug fires in the normal direction and the other in reversed polarity. Who is correct?
both
Technician A says a magnetic pulse generator type sensor generates a small AC voltage each time one of the machined slots in the trigger wheel passes by. Technician B says some ignition systems use dual Hall-effect sensors that produce a 3x and 18x/revolution pulse. Who is correct?
both
What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device? The magnetic field around the primary winding collapses The movement of the magnetic field across the winding induces a high voltage in the secondary winding both "The magnetic field around the primary winding collapses" and "The movement of the magnetic field across the winding induces a high voltage in the secondary winding" neither "The magnetic field around the primary winding collapses" nor "The movement of the magnetic field across the winding induces a high voltage in the secondary winding"
both "The magnetic field around the primary winding collapses" and "The movement of the magnetic field across the winding induces a high voltage in the secondary winding"
Spark plug cables from consecutively firing cylinders should ______. cross rather than run parallel to one another run parallel rather than cross one another cross and run parallel to one another none of these answers is correct cross rather than run parallel to one another
cross rather than run parallel to one another
The first decision the computer makes in determining the best operating strategy is to determine the _____. throttle opening engine operating mode (cranking, idling, cruise, etc.) outside air temperature barometric pressure
engine operating mode(cranking, idling, cruise, etc)
The engine coolant temperature sensor helps to control all the following EXCEPT: fuel pressure open loop/closed loop operation EGR opening ignition timing
fuel pressure
Leaner air/fuel mixtures ______. decrease the electrical resistance inside the cylinder and decrease the required firing voltage increase the electrical resistance inside the cylinder and increase the required firing voltage increase the electrical resistance inside the cylinder and decrease the required firing voltage have no measurable effect on cylinder resistance
increase the electrical resistance inside the cylinder and increase the required firing voltage
When the system is running rich, the oxygen content in the exhaust is ______. high low both A and B neither A nor B
low
Spark plug wires are being discussed. Technician A says silicon-insulated wires are used for normal temperature applications. Technician B says hypalon-insulated wires are used for high-temperature applications. Who is correct?
neither
The magnetic field surrounding the pickup coil in a magnetic pulse generator moves when the ______. reluctor tooth approaches the ignition coil reluctor tooth begins to move away from the pickup coil reluctor tooth begins to move away from the ignition coil the pickup coil is midway between two reluctor teeth
reluctor tooth approaches the ignition coil
Which statement is NOT true? Some sensors are voltage or frequency generators Some sensors are variable resistors Some sensors are simple on-off switches Some sensors are solenoids
some sensors are solenoids
The firing lines on an oscilloscope are all abnormally low. Technician A says the problem could be a faulty coil. Technician B says the problem could be a lean air/fuel mixture. Who is correct?
tech a
Coil-over-plug ignition systems are being discussed, Technician A says COP coils have less time between each firing cycle, which increases the heat in the coil and can cause premature failure. Technician B says the COP system allows the ignition timing for each cylinder to be individually changed for maximum performance as the system responds to knock sensor signals. Who is correct?
tech b
Computer-controlled ignition timing is being discussed. Technician A says when excessive wheel slippage occurs, the PCM will advance the timing to increase the torque output from the engine. Technician B says to provide smooth shifting of an automatic transmission, the PCM will temporarily retard the ignition timing to reduce the engine's torque when the transmission is beginning to change gears.
tech b
Technician A says a plug with a V-notch ground electrode will have two electric arcs jumping across the spark plug gap each time the spark plug fires. Technician B says a spark plug gap that is too wide requires higher voltage to jump the gap, which can cause a misfire. Who is correct?
tech b
The injector pulse width is ______. the size of the injector nozzle the amount of time the injector opens and sprays fuel the voltage applied to the injector solenoid coil the distance between the injector tip and the center of the intake port
the amount of time the injector opens and sprays fuel
