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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:
CO2 = 8.35 % CO2 = 7.80 %
CO = 0.00 % CO = 0.00 %
O2 = 0.91 % O2 = 0.85 %
HC = 2,150 PPM HC = 2,360 PPM
l = 0.930 l = 0.908
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
Answer: A
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What will be an ideal response?
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