Fuel injection review 2

Direct fuel injection sprays fuel...

• Into the pre cup

• Directly into the combustion chamber

• Underneath the piston

• From the side

In an evaporative fuel system which valve(s) is (are) normally closed ?

• Canister purge valve

• Canister vent valve

• Both purge and vent valves

• Neither purge nor vent valves

All of thefollowing can increase the pressure in the evaporative emission control system except _______?

• Fuel temperature

• Returned fuel from the fuel-injection system

• Inlet fuel at the fuel pump

• Volatility of the fuel

Evaporative emission control systems operate on low pressure measured in inches of water (in. H2O) 28 in. H20 is equal to how many psi

• 1

• 5

• 7

• 14.7

An enhance evaporative system is able to detect leaks of which size in the system ?

• .010 and .020 inch

• .040 and .060 inch

• .020 and .040 inch

• .060 and .080 inch

Which evap valve is subject to rust ans corrosion more than all of the others ?

• Purge valve

• Vacuum control valve

• Vent valve

• Roll over check valve

Before an evaporative emission monitor wil run, the fuel level must be where ?

• At least 75% full

• Over 25%

• Between 15% and 85%

• The level of the fuel in the tank is not needed to run the monitor test

Technician A says that low pressure smoke installed in the fuel system can be used to check for leaks. Technician B says the nitrogen under low pressure can be installed in the fuel system to check for leaks. Which technician is correct ?

• Techncian A only

• Technician B only

• Both technician A and B

• Neither Technician A nor B

The EGR valve is used to control which exhaust emission ?

• Unburned hydrocarbons (HC)

• Oxide of nitrogen (NOx)

• Carbon monoxide (CO)

• Both NOx and CO

OBD II regulations require that the EGR system be tested. Technician A says that the PCM can monitor the commanded position of the EGR valve to determine if it is functioning correctly. Technician B says that the PCM can open the EGR valve and monitor for a change in the MAP sensor or oxygen sensor reading to detect if the system is fonctioning correctly. Which technician is correct ?

• Technician A only

• Technician B only

• Both technician A and B

• Neither technician A nor B