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Exam 11: I M Failure Diagnosis and Five Gas Exhaust Analysis

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Question 1

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How and when are nitrogen oxide (NO_X) emissions formed in the internal combustion engine?

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Nitrogen oxides (NO_X) are formed in the c...

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Question 2

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If the emission levels on a 4-gas analyzer indicate that both CO and HC are high and both O₂ and CO₂ are low, what could this indicate?

A) a rich mixture
B) a lean mixture
C) the stoichiometric mixture
D) none of the above

E) A) and C)
F) B) and D)

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Question 3

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Why should you regularly clean the water trap and change the filters of the analyzer?

List the five emission gases today's repair technician can measure with a shop-grade emissions analyzer, and whether each is measured in parts per million (ppm) or as a percentage.

What should you do before beginning any diagnostic and repair procedure using an emissions analyzer, before performing any repairs?

How do Tier 2 emissions standards affect the automotive industry?

Explain the relationship of CO₂ emission levels to the air/fuel ratio in the internal combustion engine.

Oxides of nitrogen are always present in the exhaust stream as it leaves the combustion chamber.

High levels of NO_X emissions may be the result of a lean air/fuel mixture.

CO levels are highest when the vehicle is operating at the stoichiometric ratio.

When the vehicle is running rich, oxygen levels are at their highest point.

If the emission levels on a 4-gas analyzer indicate that both O₂ and HC are high and CO₂ and CO are both low, what could this indicate?

For every gallon of gasoline burned, about how much water leaves the tailpipe in vapor form?

If the EGR intake passages are partially blocked but the EGR valve mechanically and electrically functions correctly, how will emissions be affected?

What condition in the internal combustion engine will result in elevated nitrogen oxide (NO_X) levels?

The levels of carbon dioxide exhaust emissions are highest when the air/fuel ratio is lean.

The CO emission levels are a moderate indicator of what type of air/fuel ratio?

Why should you operate the exhaust emissions analyzer for 15 minutes after you complete the testing?

Oxygen levels are highest when the vehicle is operating at the stoichiometric ratio.

The levels of oxides of nitrogen exhaust emissions are highest when the air/fuel ratio is slightly rich.