A vehicle with a return-type fuel injection system is being tested with an exhaust gas analyzer and the following results are obtained (AIR pump disabled): \(\begin{array} { l l l lr} \text { At Idle:} &\quad\quad\quad& \text {At 2,500 RPM: } \\ \mathrm { CO } _ { 2 } & = 8.20 \% &\quad\quad \mathrm { CO } _ { 2 } & = & 14.30 \% \\ \mathrm { CO } & = 0.00 \% & \quad\quad\mathrm { CO } & = & 0.00 \% \\ \mathrm { O } _ { 2 } & = 5.10 \% & \quad\quad\mathrm { O } _ { 2 } & = & 0.25 \% \\ \mathrm { HC } & = 1,200 \mathrm { PPM } & \quad\quad\mathrm { HC } & = & 30 \mathrm { PP } \\ \lambda & = 1.304 &\quad\quad \lambda & = & 1.01 \end{array}\) Which condition would most likely be responsible for all of the readings shown?

A) An open spark plug wire B) A vacuum leak C) A restricted fuel filter D) A leaking fuel pressure regulator diaphragm A) An open spark plug wire B) A vacuum leak C) A restricted fuel filter D) A leaking fuel pressure regulator diaphragm B

A vehicle with a return-type fuel injection system is being tested with an exhaust gas analyzer and the following results are obtained (AIR pump disabled): \(\begin{array} { l l l lr} \text { At Idle:} &\quad\quad\quad& \text {At 2,500 RPM: } \\ \mathrm { CO } _ { 2 } & = 14.80 \% &\quad\quad \mathrm { CO } _ { 2 } & = & 8.30 \% \\ \mathrm { CO } & = 0.00 \% & \quad\quad\mathrm { CO } & = & 0.00 \% \\ \mathrm { O } _ { 2 } & = 0.20 \% & \quad\quad\mathrm { O } _ { 2 } & = & 4.25 \% \\ \mathrm { HC } & = 45 \mathrm { PPM } & \quad\quad\mathrm { HC } & = & 330 \mathrm { PPM } \\ \lambda & = 1.007 &\quad\quad \lambda & = & 1313\end{array}\) Which condition would most likely be responsible for all of the readings shown?

A) An open spark plug wire B) A vacuum leak C) A restricted fuel filter D) A leaking fuel pressure regulator diaphragm A) An open spark plug wire B) A vacuum leak C) A restricted fuel filter D) A leaking fuel pressure regulator diaphragm

A pre-OBD II vehicle with a return-type fuel injection system is being tested with an exhaust gas analyzer and the following results are obtained (AIR pump disabled): \(\begin{array} { l l l lr} \text { At Idle:} &\quad\quad\quad& \text {At 2500 RPM: } \\ \mathrm { CO } _ { 2 } & = 8.35 \% &\quad\quad \mathrm { CO } _ { 2 } & = & 7.80 \% \\ \mathrm { CO } & = 0.00 \% & \quad\quad\mathrm { CO } & = & 0.00 \% \\ \mathrm { O } _ { 2 } & = 0.91 \% & \quad\quad\mathrm { O } _ { 2 } & = & 0.85 \% \\ \mathrm { HC } & = 1,200 \mathrm { PPM } & \quad\quad\mathrm { HC } & = & 2,360\mathrm { PPM } \\ \lambda & = 0.930 &\quad\quad \lambda & = & 0.908 \end{array}\) Which condition would most likely be responsible for all of the readings shown?

A) An open spark plug wire B) A vacuum leak C) A restricted fuel filter D) A leaking fuel pressure regulator diaphragm A) An open spark plug wire B) A vacuum leak C) A restricted fuel filter D) A leaking fuel pressure regulator diaphragm

A vehicle with a return-type fuel injection system is being tested with an exhaust gas analyzer and the following results are obtained (AIR pump disabled): \(\begin{array} { l l l lr} \text { At Idle:} &\quad\quad\quad& \text {At 2,500 RPM: } \\ \mathrm { CO } _ { 2 } & = 8.10 \% &\quad\quad \mathrm { CO } _ { 2 } & = & 9.70 \% \\ \mathrm { CO } & = 10.00 \%\text { (pegged high) } & \quad\quad\mathrm { CO } & = & 8.13 \% \\ \mathrm { O } _ { 2 } & = 0.00 \% & \quad\quad\mathrm { O } _ { 2 } & = & 0.00 \% \\ \mathrm { HC } & = 850 \mathrm { PPM } & \quad\quad\mathrm { HC } & = & 530 \mathrm { PP } \\ \lambda & = 0.707&\quad\quad \lambda & = & 0.769 \end{array}\) Which condition would most likely be responsible for all of the readings shown?

A) An open spark plug wire B) A vacuum leak C) A restricted fuel filter D) A leaking fuel pressure regulator diaphragm A) An open spark plug wire B) A vacuum leak C) A restricted fuel filter D) A leaking fuel pressure regulator diaphragm

A vehicle has both excessive CO and O2 readings. Which condition is the most likely cause?

A) An intake manifold leak B) An exhaust leak C) A fuel injector leak D) An exhaust restriction A) An intake manifold leak B) An exhaust leak C) A fuel injector leak D) An exhaust restriction

Exam 6: Exhaust Gas Composition and Analysis

An exhaust analyzer that measures lambda is being discussed. Technician A says a lambda reading of 0.98 to 1.02 is considered normal. Technician B says a lambda of 1.12 indicates a lean condition. Who is correct?

Free

(Multiple Choice)

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(85)

Question 1

Correct Answer:

Verified

C

An exhaust gas analyzer (concentration sampling type) is being used to sample the exhaust of a vehicle that has an exhaust system leak. Which of these four gases will read higher than normal?

Free

(Multiple Choice)

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(73)

Question 2

Correct Answer:

Verified

D

A vehicle with a return-type fuel injection system is being tested with an exhaust gas analyzer and the following results are obtained (AIR pump disabled): At Idle: At 2,500 RPM: =8.20\% = 14.30\% =0.00\% = 0.00\% =5.10\% = 0.25\% =1,200 = 30 \lambda =1.304 \lambda = 1.01 Which condition would most likely be responsible for all of the readings shown?

Free

(Multiple Choice)

5.0/5

(95)

Question 3

Correct Answer:

Verified

B

Carbon monoxide (CO) is being discussed. Technician A says carbon monoxide may cause dizziness. Technician B says carbon monoxide smells like rotten eggs.Who is correct?

(Multiple Choice)

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(74)

Question 4

A vehicle with a return-type fuel injection system is being tested with an exhaust gas analyzer and the following results are obtained (AIR pump disabled): At Idle: At 2,500 RPM: =14.80\% = 8.30\% =0.00\% = 0.00\% =0.20\% = 4.25\% =45 = 330 \lambda =1.007 \lambda = 1313 Which condition would most likely be responsible for all of the readings shown?

(Multiple Choice)

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Question 5

Which gas can be used an indicator of a rich condition?

(Multiple Choice)

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Question 6

When an engine has good combustion (proper compression and volumetric efficiency, proper spark timing and delivery, and a stoichiometric air-fuel ratio), which level of gas emissions should be high?

(Multiple Choice)

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Question 7

A vehicle with high levels of oxides of nitrogen (NOx) is being discussed. Technician A says engine overheating is a likely cause. Technician B says a defective turbocharger intercooler may be the cause. Who is correct?

(Multiple Choice)

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Question 8

When a concentration-type gas analyzer has been properly warmed up and its probe is exposed to ambient air, what should the displayed oxygen reading indicate?

(Multiple Choice)

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Question 9

A pre-OBD II vehicle with a return-type fuel injection system is being tested with an exhaust gas analyzer and the following results are obtained (AIR pump disabled): At Idle: At 2500 RPM: =8.35\% = 7.80\% =0.00\% = 0.00\% =0.91\% = 0.85\% =1,200 = 2,360 \lambda =0.930 \lambda = 0.908 Which condition would most likely be responsible for all of the readings shown?

(Multiple Choice)

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Question 10

The term "stoichiometric" refers to an air fuel mixture of:

(Multiple Choice)

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Question 11

A vehicle with a return-type fuel injection system is being tested with an exhaust gas analyzer and the following results are obtained (AIR pump disabled): At Idle: At 2,500 RPM: =8.10\% = 9.70\% =10.00\% (pegged high) = 8.13\% =0.00\% = 0.00\% =850 = 530 \lambda =0.707 \lambda = 0.769 Which condition would most likely be responsible for all of the readings shown?

(Multiple Choice)

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Question 12

Which gas is considered toxic?

(Multiple Choice)

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Question 13

A vehicle has both excessive CO and O₂ readings. Which condition is the most likely cause?

(Multiple Choice)

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Question 14

Constant volume sampling generally tests for which four gases?

(Multiple Choice)

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Question 15

A vehicle has high levels of oxides of nitrogen (NO_x). Which condition could be the cause?

(Multiple Choice)

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Question 16

Normal combustion is being discussed. Technician A says water (H2O) is a by-product of normal combustion. Technician B says carbon dioxide (CO2) is a by-product of normal combustion. Who is correct?

(Multiple Choice)

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Question 17

Which statement is true about carbon monoxide (CO)?

(Multiple Choice)

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Question 18

Which gas can be used an indicator of a lean condition?

(Multiple Choice)

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Question 19

If a total misfire occurs within the cylinder for any reason, which gas levels will be dramatically high?

(Multiple Choice)

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(80)

Question 20

An exhaust analyzer that measures lambda is being discussed. Technician A says a lambda reading of 0.98 to 1.02 is considered normal. Technician B says a lambda of 1.12 indicates a lean condition. Who is correct?

An exhaust gas analyzer (concentration sampling type) is being used to sample the exhaust of a vehicle that has an exhaust system leak. Which of these four gases will read higher than normal?

Carbon monoxide (CO) is being discussed. Technician A says carbon monoxide may cause dizziness. Technician B says carbon monoxide smells like rotten eggs.Who is correct?

Which gas can be used an indicator of a rich condition?

When an engine has good combustion (proper compression and volumetric efficiency, proper spark timing and delivery, and a stoichiometric air-fuel ratio), which level of gas emissions should be high?

A vehicle with high levels of oxides of nitrogen (NOx) is being discussed. Technician A says engine overheating is a likely cause. Technician B says a defective turbocharger intercooler may be the cause. Who is correct?

When a concentration-type gas analyzer has been properly warmed up and its probe is exposed to ambient air, what should the displayed oxygen reading indicate?

The term "stoichiometric" refers to an air fuel mixture of:

Which gas is considered toxic?

A vehicle has both excessive CO and O₂ readings. Which condition is the most likely cause?

Constant volume sampling generally tests for which four gases?

A vehicle has high levels of oxides of nitrogen (NO_x). Which condition could be the cause?

Normal combustion is being discussed. Technician A says water (H2O) is a by-product of normal combustion. Technician B says carbon dioxide (CO2) is a by-product of normal combustion. Who is correct?

Which statement is true about carbon monoxide (CO)?

Which gas can be used an indicator of a lean condition?

If a total misfire occurs within the cylinder for any reason, which gas levels will be dramatically high?

A Review of Electricity and Electronics

Computers in Cars

Common Components for Computerized Engine Control Systems

Common Operating Principles for Computerized Engine Control Systems

Introduction to Diagnostic Concepts and Diagnostic Equipment

Understanding Obd Ii

Automotive Multiplexing and Networking of Computers

Hybrid and Electric Vehicles

Advanced Driver Assist Systems

Approach to Diagnostics

General Motors Computerized Engine Controls

Ford Motor Company Computerized Engine Controls

Chrysler Corporation Computerized Engine Controls

European Bosch Computerized Engine Controls

Asian Computerized Engine Controls

Filters

Exam 6: Exhaust Gas Composition and Analysis

An exhaust analyzer that measures lambda is being discussed. Technician A says a lambda reading of 0.98 to 1.02 is considered normal. Technician B says a lambda of 1.12 indicates a lean condition. Who is correct?

An exhaust gas analyzer (concentration sampling type) is being used to sample the exhaust of a vehicle that has an exhaust system leak. Which of these four gases will read higher than normal?

Carbon monoxide (CO) is being discussed. Technician A says carbon monoxide may cause dizziness. Technician B says carbon monoxide smells like rotten eggs.Who is correct?

Which gas can be used an indicator of a rich condition?

When an engine has good combustion (proper compression and volumetric efficiency, proper spark timing and delivery, and a stoichiometric air-fuel ratio), which level of gas emissions should be high?

A vehicle with high levels of oxides of nitrogen (NOx) is being discussed. Technician A says engine overheating is a likely cause. Technician B says a defective turbocharger intercooler may be the cause. Who is correct?

When a concentration-type gas analyzer has been properly warmed up and its probe is exposed to ambient air, what should the displayed oxygen reading indicate?

The term "stoichiometric" refers to an air fuel mixture of:

Which gas is considered toxic?

A vehicle has both excessive CO and O2 readings. Which condition is the most likely cause?

Constant volume sampling generally tests for which four gases?

A vehicle has high levels of oxides of nitrogen (NOx). Which condition could be the cause?

Normal combustion is being discussed. Technician A says water (H2O) is a by-product of normal combustion. Technician B says carbon dioxide (CO2) is a by-product of normal combustion. Who is correct?

Which statement is true about carbon monoxide (CO)?

Which gas can be used an indicator of a lean condition?

If a total misfire occurs within the cylinder for any reason, which gas levels will be dramatically high?

A Review of Electricity and Electronics

Computers in Cars

Common Components for Computerized Engine Control Systems

Common Operating Principles for Computerized Engine Control Systems

Introduction to Diagnostic Concepts and Diagnostic Equipment

Understanding Obd Ii

Automotive Multiplexing and Networking of Computers

Hybrid and Electric Vehicles

Advanced Driver Assist Systems

Approach to Diagnostics

General Motors Computerized Engine Controls

Ford Motor Company Computerized Engine Controls

Chrysler Corporation Computerized Engine Controls

European Bosch Computerized Engine Controls

Asian Computerized Engine Controls

Filters

A vehicle has both excessive CO and O₂ readings. Which condition is the most likely cause?

A vehicle has high levels of oxides of nitrogen (NO_x). Which condition could be the cause?