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Exam 11: Im Failure Diagnosis and Five-Gas Exhaust Analysis

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Question 21

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

A) True
B) False

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Question 22

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Nitrogen makes up approximately 78 percent of the air we breathe.

A) True
B) False

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Question 23

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How can you use the exhaust gas analyzer to determine the effectiveness of your repair?

What should you do to the secondary air injection system while diagnosing the cause of an emissions failure or performance problem?

The catalytic converter affects the exhaust analyzer reading of:

An emissions grade dynamometer allows a repair facility to simulate vehicle:

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

Write the chemical formula for the actual combustion gas chemistry equation for the internal combustion engine.

Describe CO emissions in relation to the air/fuel ratio, and explain how these emissions are formed.

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.

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

How do Tier 2 emissions standards affect the automotive industry?

Write the general chemical formula for the dilution correction factor.

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

Under the right conditions, a small amount of nitrogen can combine with oxygen in the combustion chamber to form oxides of nitrogen.

During a tailpipe emissions test, an audible engine "ping" occurs under a load. What emission gas would you anticipate to be elevated to the point of a potential emission failure?

A faulty spark plug wire will cause HC emissions to increase.

How can oxygen levels be used to indicate a rich air/fuel ratio?

What gases is the five-gas emissions analyzer capable of monitoring?