Power and Performance III Tuners Practice Test

These questions are part of the practice quiz. Start practicing

• Which component modulates the torque converter clutch to achieve a firmer engagement?
• True or false: Saturated circuit injectors measure between 2 and 6 ohms.
• The runner directs the bouncing air back to the intake valve.
• Which statement about the Intelligent Ignition System’s voltage handling is supported by the material?
• What is the amount of time the PCM remains in open-loop when the engine is below a certain temperature?
• Which statement about volumetric efficiency (VE) is true?
• The ______ must be correct because fuel and spark tables use calculated load as a primary input.
• Which factor primarily determines when to shift under wide-open throttle conditions?
• Which end has electrode and insulator sticking above the shell?
• The _______ process positions the spark plug ground electrode in a specific area of the combustion chamber.
• Which feature provides quicker spool time due to lower drag on the shaft?
• The _______ function tells the control module at what speed to lock and unlock the torque converter.
• The PCM uses a set throttle position during open-loop idle.
• Which tuning software must you open an existing calibration to create a new tune?
• The ______ represents the forward-facing surface area of the core.
• Technician A says that advancing cam timing increases lower-end torque improves idle, drivability, and emissions. Technician B says that retarding the timing can increase horsepower and torque at lower speeds. Which technician is correct?
• Which rev limiter cuts out spark at specific points to hold the engine RPM?
• The MAP sensor provides the PCM with information about the manifold pressure.
• A piggyback ignition module would most likely modify the signal from the PCM to control __________.
• Which technician correctly described which factor can cause oscillations in the data log during idle?
• Which component is made of plastic, aluminum, or carbon fiber?
• The throttle position sensors that are usually adjustable are which type?
• Which type of intercooler circulates water through the tubes?
• The BARO sensor makes up for altitude by either adding or subtracting from the base duty cycle.
• Which end does not include a ground electrode?
• An underdrive pulley reduces __________.
• Which type of air filter uses thick foam and honeycomb networks to trap dust particles?
• Which outcome may occur if the TPS voltage exceeds a certain limit?
• If you experience excessive boost, inspect the wastegate.
• Exchanging a pulley for one with a different diameter changes the __________.
• Which type of air filter offers the greatest protection in trapping dirt particles?
• The ______ removes heat from the incoming air charge, before it enters the engine.
• Pressure ratio is the density ratio divided by horsepower.
• Make idle control adjustments before calibrating base settings.
• In a compound turbocharger setup, are the two turbochargers typically identical in size?
• You should calibrate the PCM's Closed-Loop parameters for vehicle cruising after initial startup.
• Which statement about piggyback controllers is true?
• Low resistance injectors are also called peak and hold injectors.
• Which device is often used in GM vehicles?
• Which component may be replaced when installing Roots or screw-style superchargers?
• In a fixed amount of gas, when pressure increases, what happens to volume?
• The twin-screw supercharger has identical rotors.
• Which term describes the timing advance removed to compensate for increased pressures?
• Which component controls the fuel delivery, ignition system, and firing order?
• Excessive boost in a turbocharged engine should be checked by inspecting the wastegate.
• includes parameters to enable and disable the torque converter clutch
• If a boost leak causes a lean condition, what would be the expected trend in fuel trims?
• The MAF sensor can have adjustable calibration settings.
• What is the most likely cause of the concern indicated by the PID?
• Superchargers are driven by the exhaust.
• The coolant flowing through the throttle body prevents icing.
• An excessive ______ reading may indicate a fuel calibration concern.
• Airflow is measured in cubic centimeters.
• When calibrating adjustable cam gears, the __________ should be advanced or retarded for desired performance.
• Which sensor may use two sets of slots to provide crankshaft position in degrees to the ignition module?
• The intercooler allows you to run more ignition timing.
• Which filter type uses oiled gauze with aluminum wire mesh?
• TPS stands for which sensor?
• Which type of intercooler gives heat to the outside air across the fins?
• Which tool is typically used to detect leaks in the intake system during diagnosis?
• The throttle body that operates by linkage connected to the accelerator pedal is which type?
• Which PID in this data log, taken during idle, shows a vehicle concern?
• Which sensor adjusts base duty cycle in response to ambient air pressure to compensate altitude?
• If a performance vehicle has a 600 horsepower engine and uses 0.5 pounds of fuel per horsepower, with 6 cylinders and 6 injectors, how many pounds of fuel does it burn per hour?
• Moving the cam gear to the retard setting shifts the torque curve toward higher RPMs.
• Scaling can correct for the 'pegging the meter' concern that may occur during which conditions?
• To know what to change about the idle speed calibration, observe an idle speed data log.
• Flow boosters ease the transition around sharp edges and reduce turbulence.
• Which drive options are used for some superchargers depending on the application?
• The multi-spark ignition system is used commonly in stock applications.
• A __________ induction system uses a forward-facing scoop and pressure created by the vehicle's movement to increase static air pressure.
• Which sensor converts knock vibrations into electrical signals?
• Technician A says poor idle drivability can result from mechanical failures, electrical opens or shorts, or improper tuning calibrations. Technician B says that during idle the PCM commands spark advance for low-end torque. Which technician is correct?
• In the ________ coil, there is one coil for every two cylinders.
• BSFC calculations help determine how much fuel is required to get the desired horsepower per hour.
• Adjusting the cam gear to the ___________ setting moves the torque curve to a higher rpm range than stock.
• The ignition advance allows for richer air/fuel mixtures at start-up.
• The ______ is measured in CFM.
• Relative to ambient, what happens to MAP pressure when boost is diminished by a leak?
• By altering the length of the runner, you can optimize the resonance effect.
• Duty cycle is the percentage of injector on-time.
• Drive power of the supercharger is calculated using boost pressure and which parameter?
• What value indicates when the vehicle has warmed enough for the PCM to operate in closed-loop?
• Which parameter group includes options to enable and disable the torque converter clutch?
• You would most likely want to use a piggyback controller when __________.
• A bypass valve reduces heat and pumping loss from fixed displacement superchargers.
• The logging rate is the length of time that the data logger can record vehicle data.
• Which term provides a user-friendly interface that allows tuning and diagnostics?
• If you experience noise, check the intercooler fins.
• High-performance engines that produce maximum torque at high speed use which type of runners?
• In compressor map discussions, Technician A claims choke lines indicate efficiency drops, Technician B claims turbo speed lines represent constant speed. Which technician is correct?
• The multi-spark ignition system produces multiple sparks during each firing cycle.
• A __________ uses exhaust energy to increase the density of incoming air.
• In the _________ ignition system, one coil fires all spark plugs.
• MSD manufactures replacement ignition systems for Mercedes, BMW, and Ferrari.
• Which component has excellent airflow capacity and filters small and large particles?
• The ________ indicates the amount of energy in the fuel used by the engine.
• Check for updates to the tuning software before connecting it to the vehicle.
• Which action would you use to create a new calibration from scratch?
• Which sensor adjusts the base duty cycle based on intake air temperature?
• Which component directs the bouncing air back to the intake valve?
• If fuel rail pressure is suspected to be too high, which component should be checked?
• What speed is necessary for the PCM to switch to Closed-Loop mode?
• Which factor primarily affects spool time, making understanding turbo compressor maps important?
• Adjusting the ________ table allows the upshifts and downshifts to occur at vehicle speed values.
• What is the additional fuel the PCM commands during open-loop startup?
• Technician A says that piggybacks can modify the signal coming from the PCM to an actuator. Technician B says that a piggyback controller can be tuned to change the PCM's control strategy. Which technician is correct?
• Low boost can be caused by excessive bearing drag.
• Which component failure commonly creates a boost leak leading to a low MAP reading?
• Shorter runner lengths in high-performance intake designs are typically used to maximize airflow at high RPM.
• In the described voltage scenario, which statement is correct?
• Which statement is correct regarding a hybrid turbocharger concept, where the stock turbine housing is kept and the compressor wheel trim is increased?
• Technician A says that the PCM will go into limp-home mode if both APP sensors become faulty. Technician B says the PCM may shut down the alternator if TPS voltage exceeds a certain limit. Which technician is correct?
• The ______ streamlines airflow through the core.
• Which prompts to save a calibration before exiting?
• Low boost in a turbocharged engine can be caused by excessive bearing drag.
• Which component has larger area and shorter length runners to maximize airflow?
• Preset calibrations often come with tuning software.
• Which component reduces noise and potential damage caused by surging?
• Retarding spark timing increases torque and horsepower.
• A seized turbocharger is caused by boost pressure leaks.
• Under heavy load, which spark timing adjustment is typically used?
• Which sensor type uses a wire coiled around a permanent magnet?
• Which component is used to regulate engine idle speed by adjusting the air bypass around the throttle?
• In the N/V parameter, V stands for which?
• Decreasing the accessory pulley diameter results in what change to parasitic drag?
• In the __________ coil, there is one coil per cylinder.
• A data logger can record live sensor values.
• Which component uses the MAF data to properly match the fuel output vs. the air/fuel ratio table?
• Which action allows the technician to program a new calibration?
• What is the role of fittings in the fuel system?
• The inertia of air when the intake valve closes forms a pressure wave that travels back to the induction system.
• If you calibrate the cam gear to the ___________ setting, you will move the torque curve to a lower rpm range than stock.
• Which limiter limits the fuel and then the spark?
• Which statement about peak and hold injectors is true?
• You should advance the timing for forced induction engines to prevent detonation.
• The following should be scaled down at the same rate as airflow:
• Which describes the role of dowel pins when mounting an intake manifold to the cylinder head?
• Which statement about engine management system components is true?
• Two-step launch control: Technician A says it must be enabled with a clutch pedal; Technician B says you must calibrate the PCM to hold RPM at a specific point. Which technician is correct?
• Which PID in a cruise data log indicates a vehicle concern?
• Hondata interfaces between a replacement PCM and the laptop.
• Which type of air filter uses oiled cotton gauze with aluminum wire mesh for increased filtering capabilities?
• The cold air induction system is based on the theory that cold air has __________ density.
• By reducing ______ through smaller or lighter parts, you can reduce the turbo lag of the turbine.
• What is the lowest engine temperature at which the PCM will not switch to open-loop?
• Data loggers can record sensor data only if the logger recognizes that sensor.
• Technician A says that changes in road surfaces can cause oscillations in the data log. Technician B says that the IAT data should always match the ECT data. Which technician is correct?
• Hondata
• Which observation would support a MAP reading being lower than normal due to a leak?
• Which term describes the maximum degrees the PCM will advance the timing?
• Which component corresponds to the turbine location in a turbocharger?
• If the ________ provides an incorrect signal to the control module, shift points will occur at the wrong road speed.
• Which device connects the ignition control module microprocessor with a USB cable?
• Which type of air filter uses metal wool in oil and filters dirt through capillary action?
• The PCM advances the spark timing upon engine startup.
• Twin turbocharger system uses two identical sized turbos matched with 1/2 of the engine's need. Technician B says that compound turbochargers use turbochargers that are the identical size. Which technician is correct?
• Which sensor measures the rotation angle of the throttle blade?
• The shift light illuminates when the engine speed reaches preset maximum rpm.
• You should calibrate the PCM's __________ parameters for vehicle start-up and wide open throttle.
• Which part is affected by the combustion chamber design?
• Which parameter governs the speed points where shifts occur?
• Use an electrically driven water pump.
• Knock may result from improper ______ calibration.
• Which diagnostic signal most directly points to a boost leak as the cause of low boost?
• Which technician is correct about performance applications and centrifugal superchargers?
• Which term best describes 'the rate of timing advance' in engine control terminology?
• Which statement about street-use intercoolers is correct?
• Which term is used for the graph that shows engine torque across operating conditions?
• After the PCM resolves a knock issue, it commands __________ in small increments.
• Adjustable cam gears contain bolts that can be loosened to adjust phasing. Which is the correct feature?
• What term describes the rate at which the PCM decreases the signal for additional fuel during open-loop startup?
• PIDs retrieval is possible with which tools?
• The Intelligent Ignition System controller monitors the ignition current and the peak voltage to tailor spark to the cylinder.
• What determines the mounting location of a supercharger?
• Which retard function is programmed in increments from 0 to 15 degrees in 0.5-degree steps?
• For accurate MAF transfer, correct base ______ amounts must be set for idle, part throttle, and wide open throttle.
• Advancing the timing too far can cause engine damage.
• Do timing control modules have coils in the module to control ignition timing?
• The VE for a stock two-valve, four-stroke engine is 95%.
• includes parameters for adjusting shift points
• Which description matches SCT?
• TP data indicates the amount of vacuum in the engine.
• The ________ testing determines where the electrode gap should face in the combustion chamber.
• What should be calibrated by the manufacturer whenever fuel injectors are changed or airflow is modified?
• An ammeter is used to directly measure the resistance on an injector.
• What is the typical effect of a boost leak on boost pressure and engine performance?
• The logging rate will vary by the tuning software.
• PIDs can be retrieved with a scan tool or a data logger.
• What is the role of lines in the fuel system?
• For street use, which intercooler type is most effective?
• If the STFT adjustments reach the set limit, a DTC will be recorded.
• Which device controls TV pressure in modern vehicles?
• When running on low-octane fuel, ignition timing should be.
• During port matching, which technician is correct about using dowel pins to index the intake manifold to the cylinder head?
• What is the primary function of regulators in a fuel system?
• Before calibrating idle speed control, make base calibration adjustments.
• Air density is determined by the number of air molecules per unit volume.
• For accurate MAF transfer, which statement is correct?
• The __________ coil handles a high voltage of 500V-600 volts on the primary side.
• Engine management systems come with a replacement PCM and a wiring harness.
• Large throttle bores are preferred because of the turbulence they create.
• The centrifugal supercharger is similar to the turbocharger induction system.
• Draw-through sensors are typically used in naturally aspirated engines.
• What is the primary function of filters in a fuel system?
• Which statement about ignition spark cycles is true according to the material?
• includes parameters to modify shift pressure
• If you replace the stock camshaft with a high performance camshaft, you should adjust the target idle speed.
• Which action allows the technician to view the calibration later?
• Which retard function is used in nitrous oxide and boost applications to activate the retard function?
• Which component controls the RFI and also improves the spark at high voltages?
• The PCM controls the powertrain management strategies.
• Before installation, why is surface area an important consideration?
• You can calibrate the PCM to command timing advance just before __________.
• Parasitic drag is energy lost due to accessory components driven by the crankshaft.
• Which characteristic may cause preignition misfire, or fouling?
• An example is two-step launch control.
• In timing control, 'initial spark timing' refers to the timing adjustments during start-up and open loop.
• With reduced boost due to a leak, which manifold pressure pattern would you expect?
• The PCM opens the throttle plate further when the engine is warm than when it is cold.
• Which tuning software can you create a new calibration from scratch by clicking New?
• Which action would you use to open an existing calibration to edit?
• The Roots supercharger provides the highest thermal efficiency of any supercharger design.
• Tuning software can only tune the air/fuel ratio for open loop operation.
• The Roots supercharger is an external compression supercharger.
• Which timing parameter can be adjusted with 0 to 6 degrees of crankshaft timing per cylinder?
• The Intelligent Ignition System is capable of controlling ignition timing and phase angle.
• Brake Specific Fuel Consumption (BSFC) expresses fuel consumption as what unit?
• A data logger can record live sensor values.
• The throttle body that is commonly referred to as drive-by-wire is which type?
• Blow-through sensors are located after the supercharger, turbocharger, or intercooler, just before the throttle body.
• In high performance applications, ductwork is sized to maintain air speeds between 200 and 300 feet per second.
• Preset calibrations often come with tuning software.
• In a turbocharged engine, a leak that causes boost to fall short of the target would affect the MAP sensor reading as which of the following?
• The throttle position sensors that are 0-5 volt sensors and are typically not adjustable are which type?
• When the PCM detects a concern through the knock sensor, it commands __________ until the knock stops.
• Replacing a cast iron pulley with an aluminum pulley is used to decrease what?
• The ______ allows the system to run more ignition timing.
• If the ______ is too large, it may reduce the turbo response causing turbo lag.
• During closed-loop operation, the PCM may alter the throttle position to meet load demands.
• Which tuning software requires typing in a processor code to create a new calibration?
• The tapered runner angle is ____________ at the plenum.
• Bypass the A/C compressor has what effect on parasitic drag?
• WOT shifts occur based primarily on which parameter?
• The anti-surge valve increases the boost and is used in Roots superchargers.
• The ______ mounts on the intake system between the turbocharger and throttle body and prevents the ducting from blowing apart.
• If boost pressure is significantly reduced due to a leak, the MAP reading will be
• The component that detects combustion concerns through vibration.
• Which term describes the PCM's adjustments during start-up and open loop?
• Which component controls the airflow into the intake manifold?
• In aftermarket setups, what component is located between the production PCM and the control device or sensor?
• Using mechanically driven components has what effect on parasitic drag?
• You should place the stock camshaft gear at __________ when preparing to install an aftermarket adjustable camshaft gear.
• If there are 50 secondary turns for every one primary turn, the turn ratio will be ________.
• In a turbocharger, fresh air enters which housing?
• The opening of the turbine housing where the exhaust gases enter is called the Inducer.
• Which sensor measures the mass of air entering the engine?
• The _______ has a longer insulator tip and the heat travels a longer path.
• The _______ has a shorter insulator and operates at low temperatures.
• Which action allows the technician to share a calibration with someone else?
• Use iron pulleys.
• TV pressure in modern vehicles is controlled by which component?
• If the boost leak is corrected, what is the expected MAP reading trend?
• What term is recommended for a firmer torque converter clutch apply?
• The injector duty cycle is the amount of pressure exerted by the fuel injector.
• Regarding air filter velocity for dirt removal, which statement is correct?
• If the STFT adjustments reach the set limit, a DTC sets.
• The controller in an Intelligent Ignition System charges and discharges the capacitor once across multiple crankshaft degrees.
• Which action would you use to share a calibration with another person?
• Intercooling reduces __________, creating a powerful air/fuel charge.
• After adding ________, you improve the VE of the engine well over 100%.
• You can change the __________ to bypass mechanically driven components.
• Which end is described as angled end?
• What is the expected effect on idle performance when cam timing is advanced?
• Technician A says that any sensor data recognized by a data logger can be recorded. Technician B says that the logging rate will vary by the tuning software. Which technician is correct?
• The crankshaft-driven ______ adds power by increasing the density of the air.
• Tuning software adapts to the type of computer you use.
• In the presence of a boost leak, which MAP reading scenario is most likely?
• Adjustable cam gears often come in configurations such as 3-way or 9-way. Which option best describes this?
• Which limiter limits the spark and then the fuel?
• The boost retard system activates a different amount of retard for each gear.
• What is the most likely cause of this concern?
• Which statement is correct about fuel calculations and injector sizing? Technician A says calculating the amount of fuel an engine needs helps determine the injector size. Technician B says BSFC calculates how much fuel is required to achieve the desired horsepower in a one-hour period.
• An IAC valve allows air to bypass the throttle plate.
• Which action allows the technician to view an existing calibration?
• Which sensor typically does not require signal conditioning before sending its signal to the engine control module?
• Which action allows the technician to use another PCM's calibration?
• Which MAP reading would you expect when boost pressure is reduced by a leak?
• Before installing adjustable cam gears, you may need to perform which operation?
• HP Tuners is often used in GM vehicles and interfaces with a laptop to the stock PCM.
• The MAP sensor provides the PCM with boost pressure information.
• MSD manufactures multi-strike sparks with greater burn efficiency.
• Which component is used to cool compressed air in many forced-induction systems?
• Which sensor reading would most directly indicate a boost leak is present?
• AR in turbocharger terminology stands for area to radius ratio.
• Decrease the crankshaft pulley diameter.
• MAF transfer data is the relationship of ______ flow as it corresponds to the MAF sensor signal voltage.
• SCT uses a handheld controller that interfaces between the stock PCM and the laptop.