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Study Set
Computerized Engine Controls Study Set 1
Quiz 6: Exhaust Gas Composition and Analysis
Path 4
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Question 1
Multiple Choice
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:
C
O
2
=
8.10
%
C
O
2
=
9.70
%
C
O
=
10.00
%
(pegged high)
C
O
=
8.13
%
O
2
=
0.00
%
O
2
=
0.00
%
H
C
=
850
P
P
M
H
C
=
530
P
P
λ
=
0.707
λ
=
0.769
\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}
At Idle:
CO
2
CO
O
2
HC
λ
=
8.10%
=
10.00%
(pegged high)
=
0.00%
=
850
PPM
=
0.707
At 2,500 RPM:
CO
2
CO
O
2
HC
λ
=
=
=
=
=
9.70%
8.13%
0.00%
530
PP
0.769
Which condition would most likely be responsible for all of the readings shown?
Question 2
Multiple Choice
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:
C
O
2
=
8.35
%
C
O
2
=
7.80
%
C
O
=
0.00
%
C
O
=
0.00
%
O
2
=
0.91
%
O
2
=
0.85
%
H
C
=
1
,
200
P
P
M
H
C
=
2
,
360
P
P
M
λ
=
0.930
λ
=
0.908
\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}
At Idle:
CO
2
CO
O
2
HC
λ
=
8.35%
=
0.00%
=
0.91%
=
1
,
200
PPM
=
0.930
At 2500 RPM:
CO
2
CO
O
2
HC
λ
=
=
=
=
=
7.80%
0.00%
0.85%
2
,
360
PPM
0.908
Which condition would most likely be responsible for all of the readings shown?
Question 3
Multiple Choice
A vehicle has high levels of oxides of nitrogen (NO
x
) . Which condition could be the cause?
Question 4
Multiple Choice
If a total misfire occurs within the cylinder for any reason, which gas levels will be dramatically high?
Question 5
Multiple Choice
A vehicle has both excessive CO and O
2
readings. Which condition is the most likely cause?
Question 6
Multiple Choice
Which statement is true about carbon monoxide (CO) ?
Question 7
Multiple Choice
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?