Ch 82

OBD two equipped vehicles are required to turn on the malfunction indicator lamp if the system has detected an exhaust emission level that is__of the FTP

1.5 times higher than

NOx readings at idle should be less than

100 PPM

Which EPA bin number indicated cleaner vehicle

3

Technician a says the carpet inside the engine can cause excessive NOx to form technician B says excessive and NOx could because by cooling system for causing the engine to operate hot

Both technicians

Which gas indicates efficiency?

CO2

Which of the following is a measure of combustion efficiency

CO2

Which gas is generally considered to be the rich indicator? (The higher the level of this gas, the richer the air-fuel mixture.)

Co

All of the gases are measured in percentages except

HC

In ignition fault could cause excessive___exhaust emissions

HC

A clogged EGR could case Excessive__exhaust emissions

NOx

Which gas is generally considered to be the lean indicator

O2

Oxides of nitrogen result from a combination of nitrogen and

Oxygen

Technician a says the high HC ignition levels are often called a fall and ignition system technician he says that CO2 in missions are usually caused by a richer than normal air fuel mixture

Technician A

Some states have a testing program that uses I/M240 testing procedures the number 240 refers to

The length of the loaded mode, 240 seconds

A vehicle inspected under an OBD two testing program in the check engine light is on what will be the results of this inspection

The vehicle will fail the test

After the following exhaust emissions remeasured how was the engine operate HC 766 PPM CO2 8.2% CO 4.6% O2 .1%

Too rich

HC and CO are high, and CO2 and O2 are low. This could be caused by a _______

a rich mixture.