Driveability and emissions chapter 3

which gas is generally considered to be the rich indicator? A) HC B) CO C) CO2 D) O2

CO

Which gas indicates efficiency? A) HC B) CO C) CO2 D) O2

CO2

All of the gases are measured in percentages expect? A) HC B) CO C) CO2 D) O2

HC

An ignition fault could cause excessive ____ exhaust emissions. A) HC B) CO C) NOx D) CO2

HC

a clogged EGR passage could cause excessive ____ exhaust emissions A) HC B) CO C) NOx D) CO2

NOx

Which gas is generally considered to be the lean indicator? A) HC B) CO C) CO2 D) O2

O2

Technician A says that carbon inside the engine can cause excessive NOx to form. Technician B says that excessive NOx could be caused by a cooling system fault causing the engine to operate too hot. Which technician is correct? A) technician A B) technician B C) both technician A and B D) neither technician A nor B

both technician A and B

HC and CO are high and Co2 and O2 are low. This could be caused by a ____? A) rich mixture B) lean mixture C) defective ignition component D) clogged EGR passage

rich mixture

Techncian A says that high HC emission levels are often caused by a fault in the ignition system. technician B says that high CO2 emissions are usually caused by a richer then normal air-fuel mixture. Which technician is correct? A) technician A B) technician B C) both technician A and B D) neither technician A nor B

technician A

After the following exhaust emissions were measured, how was the engine operating? A)too rich B) too lean

too rich