Unit 172 (1) Fuel, Ignition, Air and Exhaust

Which one of the following components is shown in the image?

• Exhaust manifold

• Turbocharger

• Inlet manifold

• Carburettor

With a petrol multi-point fuel injection system the fuel is normally injected into the

• Cylinder bore

• Pre-combustion chamber

• Inlet manifold

• Exhaust manifold

When removing and replacing an inlet manifold, which one of the following is good practice? Replace the

• Spark plugs

• Air filter

• Injectors

• Manifold gaskets

Which one of the following is the main reason multi-point injection systems are preferred over single-point injection systems?

• They lower the fuel economy

• They reduce the engine power

• They increase the engine power

• They reduce the engine torque

Which one of the following methods should be used to initially test a turbocharger mechanical actuator?

• Road testing to full boost

• Using a vacuum tester and gauge

• Measuring the operating speed

• Place 12v through the actuator and measure the resistance

Which one of the following pieces of equipment should be used to inspect the condition of a fuel pump?

• Inspection lamp

• Mercer gauge

• Torque wrench

• Pressure gauge

A customer has complained of poor running and high fuel consumption and the technician has diagnosed a partially blocked air filter. Which one of the following methods should be used to check that the vehicle now meets the manufacturer’s specification and customer’s satisfaction?

• Measure the airflow across MAF sensor

• Read the fuel consumption data on the vehicle dash

• Road test for good running and improved fuel consumption

• Measure the emissions

Re-circulating exhaust gases back into the combustion chamber reduces the temperature of the combustion process and reduces

• Carbon Dioxide

• Hydrocarbons

• NOx

• Carbon Monoxide

What do the initials EGR stand for?

• Engine Gas Reduction

• Exhaust Global Ready

• Emissions Group Recirculation

• Exhaust Gas Recirculation

A vehicle is misfiring and the technician has the data logged from the lambda sensor, which shows that there is high oxygen content. What does this indicate?

• Running rich

• Running okay, faulty sensor

• Running incorrectly due to valve overlap

• Running lean