1. Battery
   Solenoid
2. Distributor cap
   High tension leads

If your car's engine is turning over sluggishly when starting, or nothing happens except for a ticking sound, it's likely your battery is the problem. That is always the first place to check.

1. A reservoir for brake fluid
   Part of the electronic system on your vehicle
2. Circulates engine coolant and dissipates the heat from it when it returns to the radiator from the engine
   Holds the oil which lubricates the engine

A radiator dissipates the heat that engine coolant carries from the engine into it. It then circulates the now cooler engine coolant back into the engine to do the same again.

1. Glow plug
   Spark plug
2. Distributor cap
   Crankshaft

Connected to the ignition coil, the spark plug provides the spark that ignites the fuel/air mixture which then provides the combustion to run the engine.

1. Wankel engine
   A spinner engine
2. A V8 engine
   An inline engine

A Wankel engine is essentially a rotary engine with all parts rotating in the same direction. It's named after Felix Wankel, the man who invented it.

1. Timing belt
   Connecting rod
2. High tension leads
   None of the above

The high tension leads conduct the electrical current from the ignition coil to the spark plugs which create the spark to start combustion in the engine.

1. Carbon Dioxide
   Nitrogen
2. Carbon Dioxide and Nitrogen
   A mixture of air and gasoline

The air/gasoline mixture is ignited by the spark from the spark plug prompting the combustion necessary to keep the engine running.

1. Piston
   Crankshaft
2. Cambelt
   None of the above

Pistons move in a linear fashion, up and down, essentially. The crankshaft, which is connected to the transmission through a flywheel, turns that movement into a rotational movement, which is needed to move a vehicle forward (or backward, depending on the gear selected).

1. Crankshaft
   Connecting Rod
2. Magneto
   Piston

A piston moves up and down within the cylinder, compressing the air/gas mixture which is then ignited by a spark from the spark plug.

1. Solenoid
   Starter motor
2. Tappet
   Rocker Arm

When you turn the key in your ignition, the starter motor engages. It turns the engine over, starting it.

1. It lubricates the moving parts within the engine.
   It cools the engine
2. It helps the engine run more efficiently.
   None of the above

There are many metal parts within the engine. These need lubrication which motor oil provides, ensuring that they do not wear out quickly.

1. Rocker arm
   Camshaft fastener
2. Connecting rod
   Starter pinion

The piston within the cylinder is connected to the crankshaft by the connecting rod.

1. The bottom part of the engine housing the cylinders, pistons etc.
   The moving parts within the cylinder that compress the gas/air mixture
2. An area where the spark plugs are kept
   None of the above

The engine block is the bottom half of the engine where all the major working components are found.

1. Machine block
   Cylinder block
2. Reciprocating block
   None of the above

The engine block is also often called the cylinder block since it houses the cylinders of the engine.

1. Inline engine
   Boxer engine
2. W engine
   Z engine

The odd one out here is a Z engine. Nothing like that exists.

1. Z engine
   Horizontally opposed engine
2. Intercooler engine
   Intake engine

Horizontally opposed engines appear in many vehicle types, including motorcycles.

1. Wankel engine
   Boxer engine
2. W Engine
   None of the above

A boxer engine, or horizontally opposed engine, sees cylinders arranged on either side of a crankshaft.

1. Mass airflow sensor
   Air blower
2. Air intake manifold
   Air filter

The air entering your car's engine needs to be clean. This is the air filter's job. Depending on the roads you drive on, it should be replaced every 15,000 to 30,000 miles, more often if you drive on dusty, unpaved roads.

1. Air intake manifold
   Exhaust valve
2. Camshaft
   Air sensor

The air intake manifold allows the gas/air mixture into the cylinders and distributes it to the intake ports equally.

1. It warms the oil to make it less thick.
   It pumps oil through the engine.
2. It is the reservoir where the oil is kept when the engine is not running.
   None of the above

When an engine is not running and oil is not pumped through it, it needs to be stored. This is the job of the sump/pan.

1. Open and close to let the gas/air mixture into the cylinder, then seal to allow combustion
   Regulate coolant flow through the engine
2. Allow gas into the air intake manifold
   None of the above

It's all about timing! Valves must open to let the gas/air mixture into the cylinder and then close to allow combustion to happen. Finally, they open to release the gases that are left over after the combustion process.

1. Solenoid
   Carburetor
2. Distributor
   Alternator

Not only does an alternator charge your battery, but​ it also powers most of the electrical systems on a vehicle. If it is faulty, your battery will quickly run flat.

1. Glow plug
   Battery
2. Exhaust manifold
   Air filter

All the other parts will be found on a gasoline-powered vehicle except a glow plug. That is just found in diesel-powered cars

1. Stops oil from leaking out the sump
   Allows the gas/air mixture into the cylinder
2. Heats up to ensure proper air/gas mixture combustion from a cold start in a diesel engine
   None of the above

Without the heat from a glow plug, a cold start in a diesel vehicle might mean the engine does not run efficiently, which would lead to increased exhaust emissions.

1. Crankshaft
   Rocker arm
2. Solenoid overheating component
   Single overhead camshaft

An engine type with one camshaft, the SOHC will open and close valves as the camshaft rotates.

1. Camshaft
   Cambelt
2. Alternator
   Sump

The rotation of the camshaft will open and close the valves of the engine. This allows combustion to take place within the cylinder (on closure) and releases the gases formed afterward (on opening).

1. Circulate oil through the engine
   Take impurities out of the oil
2. A storage place for oil when the engine is not running
   None of the above

Any impurities in the oil can damage the engine. The oil filter will remove these, keeping the oil clean and effective.

1. Cambelt
   Piston pin bush
2. Piston pin clip
   Piston ring

Piston pins are held in place on the piston by the piston pin clip.

1. Oil sump
   Fuel line
2. Fuel pump
   Fuel injector

Fuel can be delivered straight into the combustion chamber by injectors or mixed with air first, at which the intake stroke of the piston is performed.

1. Fuel filter
   Carburetor
2. Fuel line
   Distributor

Older engines used to make use of a carburetor to introduce the gas/air mixture into the cylinders. Modern engines do this by fuel injection.

1. Fuel control module
   Fuel rail
2. Fuel pressure regulator
   Fuel line

The fuel line is made of reinforced rubber to stop it from perishing.

1. Oil sump
   Oil pump
2. Oil gasket
   Oil filter

The pump does exactly what it says. It pushes oil around the engine under pressure or circulates it. This ensures all the moving parts, such as bearings, pistons, ​and others, are lubricated.

1. Fuel pump
   Fuel injector valve
2. Fuel pressure regulator
   Fuel rail

Depending on the engine, fuel pumps come in a range of configurations and types. Essentially though, they are responsible for pumping fuel along the fuel line to the engine under pressure.

1. Circulates oil in the engine
   Provides a spark to burn the gas/air mixture for combustion
2. Allows the crankshaft to spin freely by providing support
   None of the above

Bearings are a vital part of the inner workings of an engine and are found in many areas of the engine block.

1. Fuel line
   Exhaust system
2. Muffler
   Resonator

The by-product of the combustion of the gas/air mixture during combustion is a number of gases. These need to be removed from the engine through the exhaust system, starting with the exhaust manifold which collects the gases from the various cylinders then sends them down the exhaust system and out the tailpipe​.

1. Thermostat
   Glow plug
2. Distributor
   Carburetor

Starting closed, a thermostat slowly opens as the engine gets hotter from running. This allows coolant to flow from the radiator, through the engine, effectively cooling it.