test for auto

cause various components and systems to operate for test purposes

A bidirectional scanner can

cut the cylinders to their new oversized dimensions

A boring bar is used to:

a broken hard part.

A diagnostic trouble code (DTC) indicates that a vehicle has experienced all of these, EXCEPT:

compression ignition

A diesel engine is an example of a ______________ engine.

rpm to raise

Air bypassed around the throttle plate in a controlled manner will cause the engine

service history

All of the following are integral steps in diagnosing faults within the vehicle's computer system; EXCEPT retrieving and recording

a DVOM

All of the following are used to fully assess the mechanical condition of an engine, EXCEPT:

an emissions system

All of these are subsystems of modern fuel-injection systems, EXCEPT

14.7:1

For a gasoline engine, the optimum air-to-fuel ratio by mass is about

air

For gasoline to burn properly, it must be mixed with the right amount of:

in the fuel tank

Fuel pressure regulators can be located on the fuel rail and:

oxygen (O2).

Harmful tailpipe emissions include all of these, EXCEPT:

Within 10% to 15%

How even should the cranking compression be between the lowest and highest cylinder readings on an engine without mechanical problems?

torque

Twisting force is known as:

are also known as core plugs.

Water jacket plugs:

Bore the cylinder out and install a sleeve

What should be done if the cylinder bore is damaged beyond the boring limits for that engine?

Pounds per square inch (psi) or kilopascals (kPa)

What unit of measure can be used when testing engine compression and cylinder leakage?

a normal amount of leakage past the piston rings.

When performing a cylinder leakage test, the gauge reads 7% leakage and air leakage can be heard at the oil fill hole with the cap removed. This indicates:

use a number punch set (and hammer) to label all rods and caps.

When removing connecting rod bearing caps, do all of the following, EXCEPT

late ignition timing or valve timing

When testing intake manifold vacuum, a low steady reading at idle is likely to be caused by

a mechanical condition such as a burned or bent valve

When testing intake manifold vacuum, the gauge needle oscillates back and forth rapidly, which generally indicates

About 80% of the cranking compression pressure

When the throttle is snapped wide open during a running compression test, what reading should be seen for a normal cylinder?

Plastigauge

Which of the following is typically used to check oil clearance?

Outside micrometer

Which of the following is typically used to measure the crankshaft main bearing journal?

Plastigauge

Which of the following is used to check bearing clearance with the crankshaft installed in the block?

Unplug individual fuel injectors.

Which of the following methods may be used to manually perform a cylinder power balance test?

All of the answers listed

Which of the following problems can be caused by worn valve guides?

Some manufacturers require the head bolts to be loosened in a specified pattern

Which of the following should you be aware of when removing a cylinder head?

Combustion gas detection test

Which of the following tests is used to identify a cylinder head or gasket problem as the cause of engine overheating?

Gasoline direct injection (GDI)

Which of these fuel systems places the fuel injectors in the cylinder head where they can spray fuel directly into the combustion chamber?

Knock sensor

Which of these has the function of monitoring the noise that is created by a pressure spike in the combustion chamber

Volatile organic compounds (VOCs)

Which of these pollutants is caused by fuel or oil vapors?

Taper

____________ means the diameter of the cylinder is smaller at one end.

variable resistor

A potentiometer is an example of a(n):

thermistor

A resistor that changes its resistance with changes of temperature is called a

Technician A

An engine has one cylinder that measured substantially lower than specifications on a compression test. Technician A says a cylinder leakage test should be performed only on the cylinder with low compression pressure. Technician B says a cylinder leakage test should be performed on all cylinders. Who is correct?

during a 30,000 mile service.

Engine mechanical testing should be performed in all of the following situations, EXCEPT:

bearing tang

Install the bearing in the bearing cap, being careful to line up the ____________ with the notch in the cap.

data link connector (DLC).

On-board diagnostics II (OBDII) data are retrieved by connecting a scan tool to the:

manifold vacuum.

One end of the fuel pressure regulator is connected to the fuel line. The other end of the fuel pressure regulator is connected to the:

the use of a gasoline-oil mixture

One of the problems with high emissions in a two-stroke engine comes from:

Technician B

Technician A says a cylinder head made of aluminum alloy cannot be checked for cracks with the Magna-Flux process. Technician B says the aluminum head can be dye tested for cracks and pressure checked for leaks. Who is correct?

Technician A

Technician A says solid valve lifters are less likely to contribute to valve float at high rpm than hydraulic lifters. Technician B says roller tip lifters can only be hydraulic because the roller cannot stand hammering against the camshaft. Who is correct?

Technician A

Technician A says that an interference type engine has minimal clearance between the valves and the piston. Technician B says that in a noninterference engine, if the timing belt was to break, you could bend a valve. Who is correct?

Technician B

Technician A says that compression pressures have to be lower in combustion ignition engines. Technician B says that the heat of compression ignites the fuel in a compression ignition engine. Who is correct?

Technician B

Technician A says that gas caps must be vented to keep the fuel tank and atmospheric pressure equalized. Technician B says that the Environmental Protection Agency requires non-vented gas caps for emissions purposes. Who is correct?

Technician B

Technician A says that if an engine is losing oil but no leak source is found after a visual inspection, the technician should overfill the crankcase by adding two extra quarts and force the leak to get larger. Technician B says the technician should add a fluorescent dye to the engine oil and operate the engine while using a black light to find the leak. Who is correct?

Technician A

Technician A says that it is possible for a vehicle to have one fault that causes more than one code to set. Technician B says that the test light, an analog voltmeter, and a logic probe are worthwhile computer diagnostic tools. Who is correct?

Both

Technician A says that sensors are used to send information to the PCM. Technician B says that actuators, motors, and solenoids perform work. Who is correct?

Both

Technician A says the ridge at the top of the cylinder is too big if after the carbon has been scraped off it catches a fingernail. Technician B says that if the ridge is significant, and you plan to reuse the pistons, you will need to remove the ridge with a tool called a ridge reamer. Who is correct?

Technician A

Technician A says to never delete or reset diagnostic data until all testing has been completed. Technician B says to always erase any codes or data prior to diagnosis to see if the code resets. Who is correct?

clearance.

The amount of slack between the rocker arm or cam follower and the valve stem is known as valve:

camshaft.

The component that is responsible for opening the valves at the right time is called the:

crankshaft rpm

The engine misfire monitor directly detects a fault by monitoring

electrically

The fuel pump in a fuel-injection system is ___________ operated and electronically controlled.

volumetric efficiency

The percentage at which a cylinder is filled with air when it is running is known as:

crankshaft

The piston engine uses the ________ to convert the reciprocating motion of the piston into rotary motion.

All of the answers listed

The wedge combustion chamber